National Toxicology Program

National Toxicology Program
https://ntp.niehs.nih.gov/go/2910

TDMS Study 05133-03 Pathology Tables

NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29

                                                          CORE ANIMALS




       Facility:  Battelle Northwest

       Chemical CAS #:  75-05-8

       Lock Date:  05/15/92

       Cage Range:  All

       Reasons For Removal:    25022 Accidently Killed                 25019 Moribund Sacrifice
                               25020 Natural Death                     25026 Other
                               25021 Terminal Sacrifice

       Removal Date Range:     All

       Treatment Groups:       Include All
































Note:  Animals arranged according to CID number

                                                              Page   1


NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 4| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 6| 3| 1| 7| 5| 7| 6| 7| 7| 7| 7| 7| 3|             
                             DAY ON TEST   | 0| 2| 3| 3| 3| 2| 3| 3| 3| 2| 2| 3| 2| 7| 0| 3| 9| 2| 6| 3| 3| 3| 2| 3| 1|             
                                           | 6| 7| 4| 4| 4| 1| 4| 4| 4| 5| 1| 4| 3| 7| 5| 4| 7| 9| 5| 4| 4| 4| 7| 4| 0|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    CONTROL                                | 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8|             
                                           | 7| 8| 0| 1| 2| 4| 5| 6| 7| 8| 9| 0| 2| 3| 5| 6| 7| 8| 9| 0| 1| 2| 4| 6| 7|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Peyer's Patch, Leukemia Mononuclear  |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Peyer's Patch, Leukemia Mononuclear  |                                                                          |             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X              X        X        X        X  X  X     X        X   |             
                                            __________________________________________________________________________|             
   Mesentery                               |    +        +     +                    +                          +  +   |             
      Leukemia Mononuclear                 |                                        X                                 |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Pharynx                                 |       +                                                                  |             
      Squamous Cell Papilloma              |       X                                                                  |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pheochromocytoma Benign              |                   X                                                      |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  M  M  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                        X                                 |             
      Pars Distalis, Adenoma               | X        X     X  X                          X  X  X     X        X  X   |             
      Pars Distalis, Leukemia Mononuclear  |                                                       X                  |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Adenoma                      |                                                                          |             
      Follicular Cell, Carcinoma           |    X                                                                     |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page   2                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 4| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 6| 3| 1| 7| 5| 7| 6| 7| 7| 7| 7| 7| 3|             
                             DAY ON TEST   | 0| 2| 3| 3| 3| 2| 3| 3| 3| 2| 2| 3| 2| 7| 0| 3| 9| 2| 6| 3| 3| 3| 2| 3| 1|             
                                           | 6| 7| 4| 4| 4| 1| 4| 4| 4| 5| 1| 4| 3| 7| 5| 4| 7| 9| 5| 4| 4| 4| 7| 4| 0|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    CONTROL                                | 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8|             
                                           | 7| 8| 0| 1| 2| 4| 5| 6| 7| 8| 9| 0| 2| 3| 5| 6| 7| 8| 9| 0| 1| 2| 4| 6| 7|             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM - cont                     |                                                                          |             
                                           |                                                                          |             
      Adenoma                              |                      X                                                   |             
      Carcinoma                            |                X                    X                                    |             
                                            __________________________________________________________________________|             
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Polyp Stromal                        |             X        X           X           X           X               |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood                                   |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X                       X                                          |             
                                            __________________________________________________________________________|             
   Lymph Node                              |    +                                   +              +                  |             
      Iliac, Leukemia Mononuclear          |    X                                   X                                 |             
      Lumbar, Leukemia Mononuclear         |                                                                          |             
      Pancreatic, Leukemia Mononuclear     |    X                                   X              X                  |             
      Renal, Leukemia Mononuclear          |    X                                                                     |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +     +  +  +  +|             
      Leukemia Mononuclear                 |    X  X                       X        X              X                  |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  M  +|             
      Leukemia Mononuclear                 |    X  X                       X        X              X                  |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +|             
      Leukemia Mononuclear                 |    X  X                       X        X              X                  |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X                       X        X              X                  |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X              X        X        X        X  X  X     X        X   |             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X                       X        X              X                  |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma                            |                                                                          |             
      Fibroadenoma                         |             X  X     X              X              X        X            |             
      Fibroadenoma, Multiple               |                         X  X                             X     X         |             
      Fibrosarcoma                         |                                                                   X      |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Basal Cell Carcinoma                 |                                                                X         |             
      Fibroma                              |                                                                          |             
      Squamous Cell Carcinoma              |                   X                                                      |             
      Trichoepithelioma                    |                                                                X         |             
      Subcutaneous Tissue, Sarcoma         |                                                                         X|             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  I  +|             
      Cranium, Carcinoma, Metastatic,      |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page   3                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 4| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 6| 3| 1| 7| 5| 7| 6| 7| 7| 7| 7| 7| 3|             
                             DAY ON TEST   | 0| 2| 3| 3| 3| 2| 3| 3| 3| 2| 2| 3| 2| 7| 0| 3| 9| 2| 6| 3| 3| 3| 2| 3| 1|             
                                           | 6| 7| 4| 4| 4| 1| 4| 4| 4| 5| 1| 4| 3| 7| 5| 4| 7| 9| 5| 4| 4| 4| 7| 4| 0|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    CONTROL                                | 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8|             
                                           | 7| 8| 0| 1| 2| 4| 5| 6| 7| 8| 9| 0| 2| 3| 5| 6| 7| 8| 9| 0| 1| 2| 4| 6| 7|             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM - cont             |                                                                          |             
                                           |                                                                          |             
          Zymbal's Gland                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Astrocytoma NOS                      | X                                                                        |             
      Carcinoma, Metastatic, Zymbal's Gland|                                                                          |             
                                            __________________________________________________________________________|             
   Spinal Cord                             |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X                       X        X              X                  |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                                                             +            |             
                                            __________________________________________________________________________|             
   Zymbal's Gland                          |                                                                          |             
      Carcinoma                            |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                                                          |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Papilloma                            |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 SYSTEMIC LESIONS                          |                                                                          |             
                                            __________________________________________________________________________|             
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X              X        X        X        X  X  X     X        X   |             
 _____________________________________________________________________________________________________________________|             

                                                             Page   4                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 3| 7| 7| 7| 3| 7| 7| 7| 6| 7| 5| 6| 7| 7| 5| 4| 7| 7| 7| 7| 7| 6|     |            |
                             DAY ON TEST   | 3| 3| 3| 3| 3| 6| 1| 0| 3| 6| 3| 3| 2| 3| 2| 8| 7| 3| 3| 3| 3| 0| 3|     |            |
                                           | 4| 1| 4| 4| 4| 0| 4| 2| 4| 2| 4| 0| 5| 4| 1| 8| 0| 4| 4| 4| 4| 7| 7|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|     |     A      |
    CONTROL                                | 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1|     |     L      |
                                           | 8| 9| 0| 1| 2| 3| 5| 6| 7| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2|     |            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Peyer's Patch, Leukemia Mononuclear  |                X                                                         |          1 |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Peyer's Patch, Leukemia Mononuclear  |                X                                                         |          1 |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X           X  X              X        X     X     X           X      |         18 |
                                            __________________________________________________________________________|____________|
   Mesentery                               |       +        +                 +  +                                    |  10        |
      Leukemia Mononuclear                 |                X                 X                                       |          3 |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Pharynx                                 |                                                                          |   1        |
      Squamous Cell Papilloma              |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  I  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                                  X                                       |          1 |
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Pheochromocytoma Benign              |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +      |  44        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                                  X                                       |          2 |
      Pars Distalis, Adenoma               | X     X     X     X  X  X     X  X  X              X  X  X     X  X      |         24 |
      Pars Distalis, Leukemia Mononuclear  |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      C-Cell, Adenoma                      |                   X  X                                   X               |          3 |
      Follicular Cell, Carcinoma           |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page   5                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 3| 7| 7| 7| 3| 7| 7| 7| 6| 7| 5| 6| 7| 7| 5| 4| 7| 7| 7| 7| 7| 6|     |            |
                             DAY ON TEST   | 3| 3| 3| 3| 3| 6| 1| 0| 3| 6| 3| 3| 2| 3| 2| 8| 7| 3| 3| 3| 3| 0| 3|     |            |
                                           | 4| 1| 4| 4| 4| 0| 4| 2| 4| 2| 4| 0| 5| 4| 1| 8| 0| 4| 4| 4| 4| 7| 7|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|     |     A      |
    CONTROL                                | 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1|     |     L      |
                                           | 8| 9| 0| 1| 2| 3| 5| 6| 7| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2|     |            |
 __________________________________________________________________________________________________________________________________ 
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Clitoral Gland                          | +  +  +  +  +  +  +  +  M  +  +  +  +  +  +     +  +  +  +  +  +  +      |  46        |
      Adenoma                              |                                                                          |          1 |
      Carcinoma                            |       X                                            X                     |          4 |
                                            __________________________________________________________________________|____________|
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Polyp Stromal                        |    X                                   X                                 |          7 |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood                                   |                               +                                          |   1        |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                   X              X              X                 X      |          7 |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |                +  +              +                                +      |   7        |
      Iliac, Leukemia Mononuclear          |                                                                          |          2 |
      Lumbar, Leukemia Mononuclear         |                X                 X                                       |          2 |
      Pancreatic, Leukemia Mononuclear     |                   X                                               X      |          5 |
      Renal, Leukemia Mononuclear          |                   X                                                      |          2 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | +  +  +  +  M  +  +  +  +  +  +  +  +  M  +  +  +  M  +  +  +  +  +      |  43        |
      Leukemia Mononuclear                 |                X  X              X              X                 X      |         10 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
      Leukemia Mononuclear                 |                X  X              X              X                 X      |         10 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
      Leukemia Mononuclear                 |                X  X              X              X                 X      |         10 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                X  X              X              X                 X      |         10 |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X           X  X              X        X     X     X           X      |         18 |
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                X  X              X              X                 X      |         10 |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Carcinoma                            |                         X                          X                     |          2 |
      Fibroadenoma                         |       X  X  X                             X        X        X            |         12 |
      Fibroadenoma, Multiple               |                                                                          |          4 |
      Fibrosarcoma                         |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Basal Cell Carcinoma                 |                                                                          |          1 |
      Fibroma                              |                                     X                                    |          1 |
      Squamous Cell Carcinoma              |                                                                          |          1 |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page   6                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 3| 7| 7| 7| 3| 7| 7| 7| 6| 7| 5| 6| 7| 7| 5| 4| 7| 7| 7| 7| 7| 6|     |            |
                             DAY ON TEST   | 3| 3| 3| 3| 3| 6| 1| 0| 3| 6| 3| 3| 2| 3| 2| 8| 7| 3| 3| 3| 3| 0| 3|     |            |
                                           | 4| 1| 4| 4| 4| 0| 4| 2| 4| 2| 4| 0| 5| 4| 1| 8| 0| 4| 4| 4| 4| 7| 7|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|     |     A      |
    CONTROL                                | 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1|     |     L      |
                                           | 8| 9| 0| 1| 2| 3| 5| 6| 7| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2|     |            |
 __________________________________________________________________________________________________________________________________ 
 INTEGUMENTARY SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
      Trichoepithelioma                    |                                                                          |          1 |
      Subcutaneous Tissue, Sarcoma         |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Cranium, Carcinoma, Metastatic,      |                                                                          |            |
          Zymbal's Gland                   |                            X                                             |          1 |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Astrocytoma NOS                      |                                                                          |          1 |
      Carcinoma, Metastatic, Zymbal's Gland|                                              X                           |          1 |
                                            __________________________________________________________________________|____________|
   Spinal Cord                             |    +                                                                     |   1        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                X  X              X              X                 X      |         10 |
                                            __________________________________________________________________________|____________|
   Nose                                    | +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |                   +        +                                             |   3        |
                                            __________________________________________________________________________|____________|
   Zymbal's Gland                          |                            +                 +                           |   2        |
      Carcinoma                            |                            X                 X                           |          2 |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                X                                                         |          1 |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Papilloma                            |                                                                X         |          1 |
 __________________________________________________________________________________________________________________________________ 
 SYSTEMIC LESIONS                          |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X           X  X              X        X     X     X           X      |         18 |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page   7                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 5| 7| 7| 6| 7| 6| 7| 3| 6| 7| 7| 6| 6| 7| 7| 6| 7| 6| 6| 7| 7| 7|             
                             DAY ON TEST   | 1| 3| 0| 1| 3| 3| 6| 1| 3| 3| 2| 6| 3| 3| 0| 9| 0| 3| 9| 3| 2| 5| 3| 3| 3|             
                                           | 3| 5| 7| 7| 5| 5| 5| 9| 7| 5| 8| 5| 5| 5| 0| 3| 6| 5| 8| 5| 3| 1| 5| 5| 5|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    100 PPM                                | 6| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9|             
                                           | 9| 0| 1| 2| 3| 5| 6| 7| 8| 0| 2| 3| 4| 5| 6| 7| 8| 9| 1| 2| 4| 5| 6| 7| 8|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Peyer's Patch, Leukemia Mononuclear  |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibrous Histiocytoma, Metastatic,    |                                                                          |             
           Skin                            |                X                                X                        |             
      Hepatocellular Adenoma               |                                                          X               |             
      Leukemia Mononuclear                 |    X  X     X     X  X  X  X  X              X  X           X     X  X   |             
                                            __________________________________________________________________________|             
   Mesentery                               | +  +        +  +                       +                                +|             
      Granulosa-Theca Tumor Malignant,     |                                                                          |             
           Metastatic, Ovary               |                                                                          |             
      Lipoma                               |    X                                                                     |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                      X                                                   |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibrous Histiocytoma, Metastatic,    |                                                                          |             
           Skin                            |                                                 X                        |             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibrous Histiocytoma, Metastatic,    |                                                                          |             
           Skin                            |                                                 X                        |             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Granulosa-Theca Tumor Malignant,     |                                                                          |             
           Metastatic, Ovary               |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pheochromocytoma Benign              |                      X                                                   |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma                            | X                                                                        |             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  M  M  +  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma, Metastatic, Thyroid Gland |                                                                          |             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                                             X            |             
 _____________________________________________________________________________________________________________________|             

                                                             Page   8                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 5| 7| 7| 6| 7| 6| 7| 3| 6| 7| 7| 6| 6| 7| 7| 6| 7| 6| 6| 7| 7| 7|             
                             DAY ON TEST   | 1| 3| 0| 1| 3| 3| 6| 1| 3| 3| 2| 6| 3| 3| 0| 9| 0| 3| 9| 3| 2| 5| 3| 3| 3|             
                                           | 3| 5| 7| 7| 5| 5| 5| 9| 7| 5| 8| 5| 5| 5| 0| 3| 6| 5| 8| 5| 3| 1| 5| 5| 5|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    100 PPM                                | 6| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9|             
                                           | 9| 0| 1| 2| 3| 5| 6| 7| 8| 0| 2| 3| 4| 5| 6| 7| 8| 9| 1| 2| 4| 5| 6| 7| 8|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
                                           |                                                                          |             
      Pars Distalis, Adenoma               | X  X  X     X  X           X        X     X           X        X     X  X|             
      Pars Intermedia, Adenoma             |                                                                          |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Adenoma                      |                X                       X                                 |             
      C-Cell, Carcinoma                    |                                                                          |             
      Follicular Cell, Adenoma             |             X     X                                                      |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Clitoral Gland                          | +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  M  +  +  +  +  M  +  +  +|             
      Adenoma                              |                                           X                              |             
      Carcinoma                            |                                                                          |             
                                            __________________________________________________________________________|             
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Granulosa-Theca Tumor Malignant      |          X                                                               |             
                                            __________________________________________________________________________|             
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leiomyosarcoma                       |                                     X                                    |             
      Polyp Stromal                        |                   X                                                  X   |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood                                   |                                     +                                    |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                      X  X     X              X              X            |             
                                            __________________________________________________________________________|             
   Lymph Node                              |          +           +                       +              +            |             
      Axillary, Leukemia Mononuclear       |                      X                                                   |             
      Iliac, Leukemia Mononuclear          |                      X                                                   |             
      Inguinal, Leukemia Mononuclear       |                      X                                                   |             
      Pancreatic, Leukemia Mononuclear     |                      X                       X              X            |             
      Prefemoral, Leukemia Mononuclear     |                      X                                                   |             
      Renal, Granulosa-Theca Tumor         |                                                                          |             
          Malignant, Metastatic, Ovary     |          X                                                               |             
      Renal, Leukemia Mononuclear          |                                              X                           |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | +  +  +  +  +  +  M  +  +  +  +  +  +  +  M  M  +  M  +  +  +  M  +  M  +|             
      Fibrous Histiocytoma, Metastatic,    |                                                                          |             
           Skin                            |                                                 X                        |             
      Leukemia Mononuclear                 |                      X        X                             X     X      |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibrous Histiocytoma, Metastatic,    |                                                                          |             
           Skin                            |                                                 X                        |             
      Leukemia Mononuclear                 |                      X        X              X              X            |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +|             
      Leukemia Mononuclear                 |                      X        X              X                           |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M|             
 _____________________________________________________________________________________________________________________|             

                                                             Page   9                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 5| 7| 7| 6| 7| 6| 7| 3| 6| 7| 7| 6| 6| 7| 7| 6| 7| 6| 6| 7| 7| 7|             
                             DAY ON TEST   | 1| 3| 0| 1| 3| 3| 6| 1| 3| 3| 2| 6| 3| 3| 0| 9| 0| 3| 9| 3| 2| 5| 3| 3| 3|             
                                           | 3| 5| 7| 7| 5| 5| 5| 9| 7| 5| 8| 5| 5| 5| 0| 3| 6| 5| 8| 5| 3| 1| 5| 5| 5|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    100 PPM                                | 6| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9|             
                                           | 9| 0| 1| 2| 3| 5| 6| 7| 8| 0| 2| 3| 4| 5| 6| 7| 8| 9| 1| 2| 4| 5| 6| 7| 8|             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
                                           |                                                                          |             
      Fibrous Histiocytoma, Metastatic     |                                                 X                        |             
      Leukemia Mononuclear                 |                      X        X              X              X     X      |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X     X     X  X  X  X  X              X  X           X     X  X   |             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                      X                                      X            |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma                            |             X                                                            |             
      Fibroadenoma                         |       X        X  X                    X        X  X     X  X  X         |             
      Fibroadenoma, Multiple               |    X                                                  X                 X|             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibroma                              |                            X                                             |             
      Fibrous Histiocytoma                 |                X                                X                        |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Skeletal Muscle                         |                                                 +                        |             
      Fibrous Histiocytoma, Metastatic,    |                                                                          |             
           Skin                            |                                                 X                        |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Glioma NOS                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma, Metastatic, Mammary Gland |             X                                                            |             
      Fibrous Histiocytoma, Metastatic,    |                                                                          |             
           Skin                            |                X                                X                        |             
      Leukemia Mononuclear                 |       X              X  X     X              X              X     X      |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                                                                          |             
                                            __________________________________________________________________________|             
   Harderian Gland                         |          +                                                               |             
                                            __________________________________________________________________________|             
   Zymbal's Gland                          |          +                                                               |             
      Carcinoma                            |          X                                                               |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  10                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 5| 7| 7| 6| 7| 6| 7| 3| 6| 7| 7| 6| 6| 7| 7| 6| 7| 6| 6| 7| 7| 7|             
                             DAY ON TEST   | 1| 3| 0| 1| 3| 3| 6| 1| 3| 3| 2| 6| 3| 3| 0| 9| 0| 3| 9| 3| 2| 5| 3| 3| 3|             
                                           | 3| 5| 7| 7| 5| 5| 5| 9| 7| 5| 8| 5| 5| 5| 0| 3| 6| 5| 8| 5| 3| 1| 5| 5| 5|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    100 PPM                                | 6| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9|             
                                           | 9| 0| 1| 2| 3| 5| 6| 7| 8| 0| 2| 3| 4| 5| 6| 7| 8| 9| 1| 2| 4| 5| 6| 7| 8|             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM - cont                     |                                                                          |             
                                           |                                                                          |             
      Granulosa-Theca Tumor Malignant,     |                                                                          |             
           Metastatic, Ovary               |                                                                          |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                                             X            |             
 _____________________________________________________________________________________________________________________|             
 SYSTEMIC LESIONS                          |                                                                          |             
                                            __________________________________________________________________________|             
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X     X     X  X  X  X  X              X  X           X     X  X   |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  11                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 5| 7| 7| 6| 7| 6| 6| 6| 7| 7| 7| 7| 7| 6| 6| 7| 7| 6| 5| 7| 4| 7|     |            |
                             DAY ON TEST   | 3| 8| 3| 3| 1| 3| 7| 2| 2| 3| 3| 3| 2| 1| 0| 9| 3| 3| 7| 0| 3| 7| 1|     |            |
                                           | 5| 8| 5| 5| 4| 5| 1| 3| 1| 5| 5| 5| 1| 3| 3| 3| 5| 5| 9| 6| 5| 8| 8|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 1| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|     |     A      |
    100 PPM                                | 9| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2|     |     L      |
                                           | 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 0| 1| 2| 3| 4| 5| 7| 8| 9| 0| 2| 3| 4|     |            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Peyer's Patch, Leukemia Mononuclear  |             X                                                            |          1 |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Fibrous Histiocytoma, Metastatic,    |                                                                          |            |
           Skin                            |                                                                          |          2 |
      Hepatocellular Adenoma               |                                                                          |          1 |
      Leukemia Mononuclear                 | X     X     X     X                    X     X     X  X     X            |         22 |
                                            __________________________________________________________________________|____________|
   Mesentery                               |                                        +     +           +               |   9        |
      Granulosa-Theca Tumor Malignant,     |                                                                          |            |
           Metastatic, Ovary               |                                        X                                 |          1 |
      Lipoma                               |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  M  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +      |  46        |
      Fibrous Histiocytoma, Metastatic,    |                                                                          |            |
           Skin                            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Fibrous Histiocytoma, Metastatic,    |                                                                          |            |
           Skin                            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |       X                                                                  |          1 |
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Granulosa-Theca Tumor Malignant,     |                                                                          |            |
           Metastatic, Ovary               |                                        X                                 |          1 |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Pheochromocytoma Benign              |                                                             X            |          2 |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  12                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 5| 7| 7| 6| 7| 6| 6| 6| 7| 7| 7| 7| 7| 6| 6| 7| 7| 6| 5| 7| 4| 7|     |            |
                             DAY ON TEST   | 3| 8| 3| 3| 1| 3| 7| 2| 2| 3| 3| 3| 2| 1| 0| 9| 3| 3| 7| 0| 3| 7| 1|     |            |
                                           | 5| 8| 5| 5| 4| 5| 1| 3| 1| 5| 5| 5| 1| 3| 3| 3| 5| 5| 9| 6| 5| 8| 8|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 1| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|     |     A      |
    100 PPM                                | 9| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2|     |     L      |
                                           | 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 0| 1| 2| 3| 4| 5| 7| 8| 9| 0| 2| 3| 4|     |            |
 __________________________________________________________________________________________________________________________________ 
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
                                           |                                                                          |            |
      Carcinoma                            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +      |  44        |
      Carcinoma, Metastatic, Thyroid Gland |          X                                                               |          1 |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                                                                          |          1 |
      Pars Distalis, Adenoma               | X     X     X     X  X     X     X  X  X  X  X  X     X           X      |         26 |
      Pars Intermedia, Adenoma             |          X                                                               |          1 |
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      C-Cell, Adenoma                      |       X                             X                                    |          4 |
      C-Cell, Carcinoma                    |          X                                                               |          1 |
      Follicular Cell, Adenoma             |                                                                          |          2 |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Clitoral Gland                          | +  +  +  +  M  +  +  +  +  +  +  +  +  M  M  +  +  +  +  +  +  +  +      |  42        |
      Adenoma                              |                                                                          |          1 |
      Carcinoma                            |    X                                                                     |          1 |
                                            __________________________________________________________________________|____________|
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Granulosa-Theca Tumor Malignant      |                                        X                                 |          2 |
                                            __________________________________________________________________________|____________|
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leiomyosarcoma                       |                                                                          |          1 |
      Polyp Stromal                        |                         X                                   X            |          4 |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood                                   |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |       X     X     X                          X        X                  |         10 |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |                   +                                                      |   5        |
      Axillary, Leukemia Mononuclear       |                                                                          |          1 |
      Iliac, Leukemia Mononuclear          |                                                                          |          1 |
      Inguinal, Leukemia Mononuclear       |                                                                          |          1 |
      Pancreatic, Leukemia Mononuclear     |                   X                                                      |          4 |
      Prefemoral, Leukemia Mononuclear     |                                                                          |          1 |
      Renal, Granulosa-Theca Tumor         |                                                                          |            |
          Malignant, Metastatic, Ovary     |                                                                          |          1 |
      Renal, Leukemia Mononuclear          |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | +  +  +  M  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +      |  39        |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  13                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 5| 7| 7| 6| 7| 6| 6| 6| 7| 7| 7| 7| 7| 6| 6| 7| 7| 6| 5| 7| 4| 7|     |            |
                             DAY ON TEST   | 3| 8| 3| 3| 1| 3| 7| 2| 2| 3| 3| 3| 2| 1| 0| 9| 3| 3| 7| 0| 3| 7| 1|     |            |
                                           | 5| 8| 5| 5| 4| 5| 1| 3| 1| 5| 5| 5| 1| 3| 3| 3| 5| 5| 9| 6| 5| 8| 8|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 1| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|     |     A      |
    100 PPM                                | 9| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2|     |     L      |
                                           | 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 0| 1| 2| 3| 4| 5| 7| 8| 9| 0| 2| 3| 4|     |            |
 __________________________________________________________________________________________________________________________________ 
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
      Fibrous Histiocytoma, Metastatic,    |                                                                          |            |
           Skin                            |                                                                          |          1 |
      Leukemia Mononuclear                 |       X     X     X                          X        X                  |          9 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  +  +  M  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +      |  46        |
      Fibrous Histiocytoma, Metastatic,    |                                                                          |            |
           Skin                            |                                                                          |          1 |
      Leukemia Mononuclear                 |       X     X                                X     X  X                  |          9 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Leukemia Mononuclear                 |       X     X     X                          X        X                  |          8 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +      |  46        |
      Fibrous Histiocytoma, Metastatic     |                                                                          |          1 |
      Leukemia Mononuclear                 | X     X     X     X                          X        X                  |         11 |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 | X     X     X     X                    X     X     X  X     X            |         22 |
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |       X     X                                         X                  |          5 |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Carcinoma                            |                   X                          X        X                  |          4 |
      Fibroadenoma                         | X        X           X  X  X  X        X  X           X  X     X  X      |         21 |
      Fibroadenoma, Multiple               |             X                                   X           X            |          6 |
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Fibroma                              |                                                                          |          1 |
      Fibrous Histiocytoma                 |                                                                          |          2 |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Skeletal Muscle                         |                                                                          |   1        |
      Fibrous Histiocytoma, Metastatic,    |                                                                          |            |
           Skin                            |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Glioma NOS                           |    X                                                                     |          1 |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  14                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 5| 7| 7| 6| 7| 6| 6| 6| 7| 7| 7| 7| 7| 6| 6| 7| 7| 6| 5| 7| 4| 7|     |            |
                             DAY ON TEST   | 3| 8| 3| 3| 1| 3| 7| 2| 2| 3| 3| 3| 2| 1| 0| 9| 3| 3| 7| 0| 3| 7| 1|     |            |
                                           | 5| 8| 5| 5| 4| 5| 1| 3| 1| 5| 5| 5| 1| 3| 3| 3| 5| 5| 9| 6| 5| 8| 8|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 1| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|     |     A      |
    100 PPM                                | 9| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2|     |     L      |
                                           | 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 0| 1| 2| 3| 4| 5| 7| 8| 9| 0| 2| 3| 4|     |            |
 __________________________________________________________________________________________________________________________________ 
 RESPIRATORY SYSTEM - cont                 |                                                                          |            |
                                           |                                                                          |            |
      Carcinoma, Metastatic, Mammary Gland |                                                                          |          1 |
      Fibrous Histiocytoma, Metastatic,    |                                                                          |            |
           Skin                            |                                                                          |          2 |
      Leukemia Mononuclear                 |       X     X     X                    X     X        X                  |         13 |
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |                                  +                                       |   1        |
                                            __________________________________________________________________________|____________|
   Harderian Gland                         |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Zymbal's Gland                          |                                                                          |   1        |
      Carcinoma                            |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Granulosa-Theca Tumor Malignant,     |                                                                          |            |
           Metastatic, Ovary               |                                        X                                 |          1 |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                                                                          |          1 |
 __________________________________________________________________________________________________________________________________ 
 SYSTEMIC LESIONS                          |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 | X     X     X     X                    X     X     X  X     X            |         22 |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  15                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 6| 4| 7| 7| 5| 7| 6| 7| 5| 5| 6| 7| 7| 6| 7| 7| 7| 7| 5| 3| 7| 5|             
                             DAY ON TEST   | 3| 3| 2| 2| 6| 3| 3| 9| 3| 2| 3| 6| 5| 5| 3| 3| 7| 3| 3| 3| 3| 6| 7| 3| 3|             
                                           | 5| 5| 7| 3| 9| 5| 5| 7| 5| 5| 5| 6| 5| 1| 5| 5| 1| 5| 5| 5| 5| 7| 6| 5| 4|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3|             
    200 PPM                                | 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0| 0| 0|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 2| 3| 4| 5| 6| 8| 9| 1| 2| 3| 4| 5| 7| 8| 9|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 | X        X        X  X  X     X        X     X                       X  X|             
                                            __________________________________________________________________________|             
   Mesentery                               |                               +                 +  +     +  +            |             
      Lipoma                               |                                                                          |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  I  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pheochromocytoma Malignant           |                                                                   X      |             
      Pheochromocytoma Benign              |                                                                         X|             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |                                                          X           X   |             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  M  +  M|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  I  +  +  +  +  +  +  +  +  +  +  +  +|             
      Schwannoma Malignant, Metastatic,    |                                                                          |             
           Brain                           |                                                                          |             
      Pars Distalis, Adenoma               | X     X  X        X     X     X  X     X  X  X  X  X           X     X  X|             
      Pars Distalis, Leukemia Mononuclear  |                                                                          |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Adenoma                      |                                                       X  X  X            |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |                   X                                                      |             
      Carcinoma                            |                         X                    X                           |             
                                            __________________________________________________________________________|             
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  16                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 6| 4| 7| 7| 5| 7| 6| 7| 5| 5| 6| 7| 7| 6| 7| 7| 7| 7| 5| 3| 7| 5|             
                             DAY ON TEST   | 3| 3| 2| 2| 6| 3| 3| 9| 3| 2| 3| 6| 5| 5| 3| 3| 7| 3| 3| 3| 3| 6| 7| 3| 3|             
                                           | 5| 5| 7| 3| 9| 5| 5| 7| 5| 5| 5| 6| 5| 1| 5| 5| 1| 5| 5| 5| 5| 7| 6| 5| 4|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3|             
    200 PPM                                | 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0| 0| 0|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 2| 3| 4| 5| 6| 8| 9| 1| 2| 3| 4| 5| 7| 8| 9|             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM - cont                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Polyp Stromal                        |          X                                X                              |             
      Bilateral, Polyp Stromal             |                                              X                           |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                      X                 X                                X|             
                                            __________________________________________________________________________|             
   Lymph Node                              |          +                             +        +           +            |             
      Axillary, Leukemia Mononuclear       |                                                                          |             
      Lumbar, Leukemia Mononuclear         |                                                                          |             
      Pancreatic, Leukemia Mononuclear     |          X                             X                                 |             
      Renal, Leukemia Mononuclear          |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  M  +  +  +|             
      Leukemia Mononuclear                 |                      X                 X                             X   |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | M  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |          X           X                 X     X                           |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |          X           X                 X     X                       X   |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  M  M  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |          X           X                 X     X                       X   |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 | X        X        X  X  X     X        X     X                       X  X|             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                        X     X                       X   |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma                            | X                                                                        |             
      Fibroadenoma                         |             X     X        X     X     X  X  X     X  X     X        X   |             
      Fibroadenoma, Multiple               |                                                          X               |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pinna, Melanoma NOS                  |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Schwannoma Malignant, Metastatic,    |                                                                          |             
           Brain                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Glioma NOS                           |                                     X                                    |             
      Cranial Nerve, Schwannoma Malignant  |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  17                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 6| 4| 7| 7| 5| 7| 6| 7| 5| 5| 6| 7| 7| 6| 7| 7| 7| 7| 5| 3| 7| 5|             
                             DAY ON TEST   | 3| 3| 2| 2| 6| 3| 3| 9| 3| 2| 3| 6| 5| 5| 3| 3| 7| 3| 3| 3| 3| 6| 7| 3| 3|             
                                           | 5| 5| 7| 3| 9| 5| 5| 7| 5| 5| 5| 6| 5| 1| 5| 5| 1| 5| 5| 5| 5| 7| 6| 5| 4|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3|             
    200 PPM                                | 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0| 0| 0|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 2| 3| 4| 5| 6| 8| 9| 1| 2| 3| 4| 5| 7| 8| 9|             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM - cont                 |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |          X           X                 X     X                       X   |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Ear                                     |                                                                +         |             
                                            __________________________________________________________________________|             
   Eye                                     |    +                                                                     |             
                                            __________________________________________________________________________|             
   Lacrimal Gland                          |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lipoma                               |                                                                          |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 SYSTEMIC LESIONS                          |                                                                          |             
                                            __________________________________________________________________________|             
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 | X        X        X  X  X     X        X     X                       X  X|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  18                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 6| 7| 4| 6| 7| 2| 7| 7| 7| 7| 7| 7| 5| 6| 6| 7| 7| 7| 7| 6| 5| 7|     |            |
                             DAY ON TEST   | 3| 9| 3| 8| 7| 3| 9| 3| 3| 3| 3| 3| 3| 6| 5| 8| 3| 1| 3| 3| 6| 8| 3|     |            |
                                           | 5| 3| 5| 5| 1| 5| 2| 5| 5| 5| 5| 5| 5| 6| 1| 5| 5| 9| 5| 5| 5| 8| 5|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|     |     A      |
    200 PPM                                | 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3|     |     L      |
                                           | 0| 3| 4| 5| 6| 7| 8| 9| 0| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 4| 5| 6|     |            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                                  X        X  X  X  X  X  X  X  X  X      |         20 |
                                            __________________________________________________________________________|____________|
   Mesentery                               |                                  +                    +        +         |   8        |
      Lipoma                               |                                  X                                       |          1 |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Pheochromocytoma Malignant           |                                                                          |          1 |
      Pheochromocytoma Benign              |                X                                                         |          2 |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Adenoma                              |                                                                          |          2 |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +      |  44        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Schwannoma Malignant, Metastatic,    |                                                                          |            |
           Brain                           |                   X                                                      |          1 |
      Pars Distalis, Adenoma               | X  X  X        X     X  X           X        X  X  X  X  X  X            |         28 |
      Pars Distalis, Leukemia Mononuclear  |                                           X                              |          1 |
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      C-Cell, Adenoma                      |                                     X                                    |          4 |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  19                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 6| 7| 4| 6| 7| 2| 7| 7| 7| 7| 7| 7| 5| 6| 6| 7| 7| 7| 7| 6| 5| 7|     |            |
                             DAY ON TEST   | 3| 9| 3| 8| 7| 3| 9| 3| 3| 3| 3| 3| 3| 6| 5| 8| 3| 1| 3| 3| 6| 8| 3|     |            |
                                           | 5| 3| 5| 5| 1| 5| 2| 5| 5| 5| 5| 5| 5| 6| 1| 5| 5| 9| 5| 5| 5| 8| 5|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|     |     A      |
    200 PPM                                | 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3|     |     L      |
                                           | 0| 3| 4| 5| 6| 7| 8| 9| 0| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 4| 5| 6|     |            |
 __________________________________________________________________________________________________________________________________ 
 GENITAL SYSTEM - cont                     |                                                                          |            |
                                           |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Clitoral Gland                          | +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Adenoma                              |                                                                          |          1 |
      Carcinoma                            |                X                 X                                       |          4 |
                                            __________________________________________________________________________|____________|
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Polyp Stromal                        |       X  X           X  X  X                                             |          7 |
      Bilateral, Polyp Stromal             |                                     X                                    |          2 |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                                  X        X  X     X        X  X         |          9 |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |                                  +     +  +        +                     |   8        |
      Axillary, Leukemia Mononuclear       |                                  X                                       |          1 |
      Lumbar, Leukemia Mononuclear         |                                  X                                       |          1 |
      Pancreatic, Leukemia Mononuclear     |                                           X        X                     |          4 |
      Renal, Leukemia Mononuclear          |                                  X                                       |          1 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | +  M  +  M  M  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  41        |
      Leukemia Mononuclear                 |                                  X        X  X  X  X        X  X         |         10 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  45        |
      Leukemia Mononuclear                 |                                  X        X  X  X  X        X  X         |         11 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Leukemia Mononuclear                 |                                  X        X  X  X  X        X  X         |         12 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  45        |
      Leukemia Mononuclear                 |                                  X        X  X  X  X        X  X         |         12 |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                                  X        X  X  X  X  X  X  X  X  X      |         20 |
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                                  X        X  X                 X         |          7 |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Carcinoma                            |                                                       X           X      |          3 |
      Fibroadenoma                         | X           X                          X     X  X           X            |         17 |
      Fibroadenoma, Multiple               |                      X           X                    X                  |          4 |
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Pinna, Melanoma NOS                  |                                                          X               |          1 |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  20                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 6| 7| 4| 6| 7| 2| 7| 7| 7| 7| 7| 7| 5| 6| 6| 7| 7| 7| 7| 6| 5| 7|     |            |
                             DAY ON TEST   | 3| 9| 3| 8| 7| 3| 9| 3| 3| 3| 3| 3| 3| 6| 5| 8| 3| 1| 3| 3| 6| 8| 3|     |            |
                                           | 5| 3| 5| 5| 1| 5| 2| 5| 5| 5| 5| 5| 5| 6| 1| 5| 5| 9| 5| 5| 5| 8| 5|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|     |     A      |
    200 PPM                                | 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3|     |     L      |
                                           | 0| 3| 4| 5| 6| 7| 8| 9| 0| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 4| 5| 6|     |            |
 __________________________________________________________________________________________________________________________________ 
 MUSCULOSKELETAL SYSTEM - cont             |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Schwannoma Malignant, Metastatic,    |                                                                          |            |
           Brain                           |                   X                                                      |          1 |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Glioma NOS                           |                                                                          |          1 |
      Cranial Nerve, Schwannoma Malignant  |                   X                                                      |          1 |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                                  X        X  X  X  X        X  X         |         12 |
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Ear                                     |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Eye                                     |                                     +                                    |   2        |
                                            __________________________________________________________________________|____________|
   Lacrimal Gland                          |                +                                                         |   1        |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Lipoma                               |                                                       X                  |          1 |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  I  +  +  +  +  +      |  47        |
      Leukemia Mononuclear                 |                                  X                                       |          1 |
 __________________________________________________________________________________________________________________________________ 
 SYSTEMIC LESIONS                          |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                                  X        X  X  X  X  X  X  X  X  X      |         20 |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  21                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 6| 5| 7| 7| 6| 7| 6| 7| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 5| 6| 7| 7| 6| 7|             
                             DAY ON TEST   | 3| 7| 5| 3| 3| 1| 3| 7| 2| 7| 6| 3| 2| 3| 3| 3| 3| 3| 3| 7| 7| 3| 3| 9| 3|             
                                           | 4| 0| 8| 4| 4| 8| 4| 2| 3| 9| 6| 4| 1| 4| 4| 4| 4| 4| 4| 2| 9| 4| 4| 3| 4|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|             
    400 PPM                                | 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2|             
                                           | 3| 4| 5| 6| 8| 9| 0| 1| 2| 3| 4| 6| 8| 9| 1| 2| 3| 4| 5| 6| 7| 8| 9| 1| 2|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
      Leukemia Mononuclear                 |       X     X  X  X     X  X  X     X  X                    X     X      |             
                                            __________________________________________________________________________|             
   Mesentery                               |          +  +  +                       +  +                          +   |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
      Leukemia Mononuclear                 |                               X                                          |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Neoplasm NOS                         |                                                          X               |             
      Pheochromocytoma Benign              |             X                                                            |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
      Carcinoma                            |    X                                                                     |             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  I  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
      Leukemia Mononuclear                 |                         X                                                |             
      Pars Distalis, Adenoma               | X  X              X  X     X     X  X  X        X  X  X        X  X  X  X|             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
      C-Cell, Adenoma                      |                   X              X                                      X|             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |             X                          X                       X         |             
      Carcinoma                            |                                                                          |             
                                            __________________________________________________________________________|             
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  22                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 6| 5| 7| 7| 6| 7| 6| 7| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 5| 6| 7| 7| 6| 7|             
                             DAY ON TEST   | 3| 7| 5| 3| 3| 1| 3| 7| 2| 7| 6| 3| 2| 3| 3| 3| 3| 3| 3| 7| 7| 3| 3| 9| 3|             
                                           | 4| 0| 8| 4| 4| 8| 4| 2| 3| 9| 6| 4| 1| 4| 4| 4| 4| 4| 4| 2| 9| 4| 4| 3| 4|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|             
    400 PPM                                | 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2|             
                                           | 3| 4| 5| 6| 8| 9| 0| 1| 2| 3| 4| 6| 8| 9| 1| 2| 3| 4| 5| 6| 7| 8| 9| 1| 2|             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM - cont                     |                                                                          |             
                                           |                                                                          |             
      Carcinoma                            |                                  X                                       |             
      Hemangioma                           |                                                                         X|             
      Polyp Stromal                        |                         X                 X                       X      |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
      Leukemia Mononuclear                 |       X        X  X     X     X                             X            |             
                                            __________________________________________________________________________|             
   Lymph Node                              |                +        +     +                                   +      |             
      Axillary, Leukemia Mononuclear       |                         X                                                |             
      Deep Cervical, Leukemia Mononuclear  |                         X                                                |             
      Iliac, Leukemia Mononuclear          |                         X                                                |             
      Lumbar, Leukemia Mononuclear         |                         X                                                |             
      Pancreatic, Leukemia Mononuclear     |                X                                                  X      |             
      Renal, Leukemia Mononuclear          |                               X                                          |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | +  M  M  +  M  +  +  +  +  +  +  +  +  +  +  +  +  M  +  M  M  +  +  +  +|             
      Leukemia Mononuclear                 |                X  X     X  X  X                                          |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +|             
      Leukemia Mononuclear                 |       X        X  X     X  X  X                             X     X      |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |       X        X  X     X  X  X                             X     X      |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |       X        X  X     X  X  X                             X            |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  A  +  +  +  +  +|             
      Leukemia Mononuclear                 |       X     X  X  X     X  X  X     X  X                    X     X      |             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |       X        X        X           X                                    |             
      Thymoma NOS                          |                      X                                                   |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma                            |                                  X                                       |             
      Fibroadenoma                         |                      X                 X        X  X              X  X  X|             
      Fibroadenoma, Multiple               |          X  X              X              X              X     X         |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibroma, Multiple                    |                                                                X         |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  23                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 6| 5| 7| 7| 6| 7| 6| 7| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 5| 6| 7| 7| 6| 7|             
                             DAY ON TEST   | 3| 7| 5| 3| 3| 1| 3| 7| 2| 7| 6| 3| 2| 3| 3| 3| 3| 3| 3| 7| 7| 3| 3| 9| 3|             
                                           | 4| 0| 8| 4| 4| 8| 4| 2| 3| 9| 6| 4| 1| 4| 4| 4| 4| 4| 4| 2| 9| 4| 4| 3| 4|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|             
    400 PPM                                | 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2|             
                                           | 3| 4| 5| 6| 8| 9| 0| 1| 2| 3| 4| 6| 8| 9| 1| 2| 3| 4| 5| 6| 7| 8| 9| 1| 2|             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM - cont                 |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
      Alveolar/Bronchiolar Adenoma         |             X                                                            |             
      Leukemia Mononuclear                 |       X        X  X     X  X  X                             X     X      |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                      +                                                   |             
                                            __________________________________________________________________________|             
   Harderian Gland                         |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  I  +  +  +  +  +  A  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SYSTEMIC LESIONS                          |                                                                          |             
                                            __________________________________________________________________________|             
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |       X     X  X  X     X  X  X     X  X                    X     X      |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  24                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 4| 3| 7| 6| 6| 7| 7| 7| 6| 7| 5| 7| 7| 7| 7| 7| 7| 7|     |            |
                             DAY ON TEST   | 3| 3| 2| 0| 3| 2| 9| 3| 2| 7| 3| 3| 3| 7| 3| 9| 3| 3| 3| 3| 3| 3| 3|     |            |
                                           | 4| 4| 9| 7| 4| 7| 4| 4| 9| 2| 4| 4| 4| 9| 4| 9| 4| 4| 4| 4| 4| 4| 4|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |     A      |
    400 PPM                                | 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |     L      |
                                           | 3| 4| 5| 6| 7| 9| 0| 1| 2| 3| 4| 6| 7| 8| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  45        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  A  +  +  +  I  +  +  +  +  +  +  +  +  +  +      |  45        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  45        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  45        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  A  +  +  +  +  +  +  +      |  45        |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
      Leukemia Mononuclear                 |       X  X     X           X  X  X  X  X  X        X  X  X     X         |         24 |
                                            __________________________________________________________________________|____________|
   Mesentery                               | +                                                           +     +      |   9        |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
      Leukemia Mononuclear                 |       X                                                                  |          2 |
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Leukemia Mononuclear                 |                            X                                             |          1 |
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Neoplasm NOS                         |                                                                          |          1 |
      Pheochromocytoma Benign              |                            X                                             |          2 |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
      Carcinoma                            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  M  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  45        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  45        |
      Leukemia Mononuclear                 |                X                                                         |          2 |
      Pars Distalis, Adenoma               | X  X     X           X     X     X  X     X  X  X     X  X  X     X      |         29 |
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
      C-Cell, Adenoma                      |       X                                                                  |          4 |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  25                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 4| 3| 7| 6| 6| 7| 7| 7| 6| 7| 5| 7| 7| 7| 7| 7| 7| 7|     |            |
                             DAY ON TEST   | 3| 3| 2| 0| 3| 2| 9| 3| 2| 7| 3| 3| 3| 7| 3| 9| 3| 3| 3| 3| 3| 3| 3|     |            |
                                           | 4| 4| 9| 7| 4| 7| 4| 4| 9| 2| 4| 4| 4| 9| 4| 9| 4| 4| 4| 4| 4| 4| 4|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |     A      |
    400 PPM                                | 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |     L      |
                                           | 3| 4| 5| 6| 7| 9| 0| 1| 2| 3| 4| 6| 7| 8| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 GENITAL SYSTEM - cont                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Clitoral Gland                          | +  +  +  +  +  +  +  +  A  M  +  +  +  +  +  +  +  +  +  +  M  +  +      |  45        |
      Adenoma                              |                                                                          |          3 |
      Carcinoma                            |                                                 X              X         |          2 |
                                            __________________________________________________________________________|____________|
   Ovary                                   | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Uterus                                  | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Carcinoma                            |                                                                          |          1 |
      Hemangioma                           |                                                                          |          1 |
      Polyp Stromal                        |                      X                                            X      |          5 |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
      Leukemia Mononuclear                 |       X        X              X        X                                 |         10 |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |       +        +              +        +                                 |   8        |
      Axillary, Leukemia Mononuclear       |                                                                          |          1 |
      Deep Cervical, Leukemia Mononuclear  |                                                                          |          1 |
      Iliac, Leukemia Mononuclear          |                                                                          |          1 |
      Lumbar, Leukemia Mononuclear         |                X                                                         |          2 |
      Pancreatic, Leukemia Mononuclear     |       X        X              X        X                                 |          6 |
      Renal, Leukemia Mononuclear          |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | +  M  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  40        |
      Leukemia Mononuclear                 |       X        X           X  X     X  X  X                              |         12 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  A  +  +  M  +  +  +  +  +  +  +  +  +  M  M      |  42        |
      Leukemia Mononuclear                 |       X        X           X  X     X     X                              |         14 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Leukemia Mononuclear                 |       X        X           X  X     X  X  X                              |         15 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  M  +  +  +      |  46        |
      Leukemia Mononuclear                 |       X        X           X  X     X  X  X                              |         14 |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  45        |
      Leukemia Mononuclear                 |       X  X     X           X  X  X  X  X  X        X  X  X     X         |         24 |
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Leukemia Mononuclear                 |                X              X     X                    X               |          8 |
      Thymoma NOS                          |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Carcinoma                            |          X                 X                                             |          3 |
      Fibroadenoma                         | X  X  X  X        X  X     X  X           X                              |         16 |
      Fibroadenoma, Multiple               |             X                                                            |          7 |
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  26                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 4| 3| 7| 6| 6| 7| 7| 7| 6| 7| 5| 7| 7| 7| 7| 7| 7| 7|     |            |
                             DAY ON TEST   | 3| 3| 2| 0| 3| 2| 9| 3| 2| 7| 3| 3| 3| 7| 3| 9| 3| 3| 3| 3| 3| 3| 3|     |            |
                                           | 4| 4| 9| 7| 4| 7| 4| 4| 9| 2| 4| 4| 4| 9| 4| 9| 4| 4| 4| 4| 4| 4| 4|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |     A      |
    400 PPM                                | 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |     L      |
                                           | 3| 4| 5| 6| 7| 9| 0| 1| 2| 3| 4| 6| 7| 8| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 INTEGUMENTARY SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
      Fibroma, Multiple                    |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
      Alveolar/Bronchiolar Adenoma         |             X                                                            |          2 |
      Leukemia Mononuclear                 |       X  X     X           X  X  X  X  X  X                              |         17 |
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  A  +  +  +  M  +  +  +  +  +  +  +  +  +  +      |  45        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |                               +        +                                 |   3        |
                                            __________________________________________________________________________|____________|
   Harderian Gland                         |       +                                                                  |   1        |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  45        |
 __________________________________________________________________________________________________________________________________ 
 SYSTEMIC LESIONS                          |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |       X  X     X           X  X  X  X  X  X        X  X  X     X         |         24 |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  27                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 6| 6| 6| 6| 6| 6| 4| 7| 6| 5| 5| 6| 6| 7| 3| 5| 7| 6| 6| 6| 7| 7| 5| 6| 6|             
                             DAY ON TEST   | 9| 9| 3| 3| 8| 5| 8| 3| 5| 2| 6| 5| 2| 3| 9| 8| 2| 4| 0| 7| 2| 3| 6| 8| 8|             
                                           | 3| 9| 7| 2| 5| 1| 3| 3| 1| 4| 6| 2| 3| 3| 4| 7| 1| 6| 9| 9| 9| 3| 1| 6| 4|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    CONTROL                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 6| 7| 8| 9| 0| 1| 3| 4| 5| 6| 7|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|             
      Fibrosarcoma                         |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hepatocellular Carcinoma             |       X                                                                  |             
      Leukemia Mononuclear                 |       X     X  X  X        X  X  X  X  X     X  X  X     X     X  X  X  X|             
                                            __________________________________________________________________________|             
   Mesentery                               |                            +        +        +  +     +                  |             
      Leukemia Mononuclear                 |                                     X           X                        |             
      Mesothelioma NOS                     |                                                       X                  |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                                 X                        |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                                                          |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |       X           X        X                                             |             
      Mesothelioma NOS, Metastatic, Testes |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pheochromocytoma Benign              |             X                                      X                     |             
      Bilateral, Pheochromocytoma Benign   |                                                                X         |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |                X                                                         |             
      Carcinoma                            | X                                                                        |             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |             X                                   X                        |             
      Pars Distalis, Adenoma               | X  X     X     X  X     X     X  X     X  X        X                 X  X|             
      Pars Intermedia, Adenoma             |                            X                                             |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Adenoma                      | X              X                 X                 X                     |             
      C-Cell, Carcinoma                    |                                                          X               |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  28                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 6| 6| 6| 6| 6| 6| 4| 7| 6| 5| 5| 6| 6| 7| 3| 5| 7| 6| 6| 6| 7| 7| 5| 6| 6|             
                             DAY ON TEST   | 9| 9| 3| 3| 8| 5| 8| 3| 5| 2| 6| 5| 2| 3| 9| 8| 2| 4| 0| 7| 2| 3| 6| 8| 8|             
                                           | 3| 9| 7| 2| 5| 1| 3| 3| 1| 4| 6| 2| 3| 3| 4| 7| 1| 6| 9| 9| 9| 3| 1| 6| 4|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    CONTROL                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 6| 7| 8| 9| 0| 1| 3| 4| 5| 6| 7|             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Mesothelioma NOS                     |                                                       X                  |             
                                            __________________________________________________________________________|             
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma                            |          X              X                                            X   |             
                                            __________________________________________________________________________|             
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Bilateral, Mesothelioma NOS          |                                                       X                  |             
      Bilateral, Interstitial Cell, Adenoma|    X  X  X  X        X     X  X     X           X     X     X  X     X  X|             
      Interstitial Cell, Adenoma           | X                       X        X     X     X                           |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |       X     X     X        X  X     X        X     X                    X|             
                                            __________________________________________________________________________|             
   Lymph Node                              |                   +        +        +           +  +  +           +  +   |             
      Lumbar, Leukemia Mononuclear         |                                     X              X                     |             
      Pancreatic, Leukemia Mononuclear     |                   X        X                                      X      |             
      Renal, Leukemia Mononuclear          |                                                 X  X                 X   |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | +  +  +  M  +  +  M  +  +  +  +  +  +  M  M  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |       X     X  X           X     X  X        X  X  X              X  X  X|             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +|             
      Leukemia Mononuclear                 |       X     X  X  X        X  X  X  X           X  X              X  X  X|             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |       X     X  X  X        X     X  X           X  X              X      |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |       X     X  X  X        X     X  X        X  X  X              X  X  X|             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |       X     X  X  X        X  X  X  X  X     X  X  X     X     X  X  X  X|             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |       X     X  X           X                    X                        |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibroma                              |    X                                                                     |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Rib, Osteosarcoma                    |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  29                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 6| 6| 6| 6| 6| 6| 4| 7| 6| 5| 5| 6| 6| 7| 3| 5| 7| 6| 6| 6| 7| 7| 5| 6| 6|             
                             DAY ON TEST   | 9| 9| 3| 3| 8| 5| 8| 3| 5| 2| 6| 5| 2| 3| 9| 8| 2| 4| 0| 7| 2| 3| 6| 8| 8|             
                                           | 3| 9| 7| 2| 5| 1| 3| 3| 1| 4| 6| 2| 3| 3| 4| 7| 1| 6| 9| 9| 9| 3| 1| 6| 4|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    CONTROL                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 6| 7| 8| 9| 0| 1| 3| 4| 5| 6| 7|             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM - cont                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Glioma Malignant                     |                                                                          |             
                                            __________________________________________________________________________|             
   Peripheral Nerve                        |                            +                                             |             
                                            __________________________________________________________________________|             
   Spinal Cord                             |                            +                                             |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Alveolar/Bronchiolar Adenoma         |                                                          X               |             
      Alveolar/Bronchiolar Carcinoma       |                                                                          |             
      Leukemia Mononuclear                 |       X     X     X        X     X  X        X  X  X              X      |             
      Mesothelioma NOS, Metastatic, Testes |                                                                          |             
      Neoplasm NOS, Metastatic, Uncertain  |                                                                          |             
          Primary Site                     |                                     X                                    |             
      Osteosarcoma, Metastatic, Bone       |                                                                          |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Ear                                     |                                                                   +      |             
      Pinna, Schwannoma Benign             |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                   X                                                      |             
      Renal Tubule, Adenoma                |                                                                          |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SYSTEMIC LESIONS                          |                                                                          |             
                                            __________________________________________________________________________|             
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |       X     X  X  X        X  X  X  X  X     X  X  X     X     X  X  X  X|             
      Mesothelioma NOS                     |                                                       X                  |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  30                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 4| 5| 7| 4| 7| 5| 4| 5| 5| 7| 6| 7| 6| 7| 6| 7| 6| 5| 6| 7| 7| 7|     |            |
                             DAY ON TEST   | 3| 1| 2| 3| 7| 0| 3| 9| 9| 1| 0| 8| 3| 7| 3| 7| 3| 8| 4| 0| 3| 3| 3|     |            |
                                           | 3| 8| 0| 3| 2| 1| 9| 2| 7| 1| 7| 5| 3| 9| 3| 4| 3| 4| 6| 2| 3| 3| 3|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     A      |
    CONTROL                                | 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5|     |     L      |
                                           | 8| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 2| 3| 5| 6| 7| 8| 9| 1| 2| 3| 5| 6|     |            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Fibrosarcoma                         |                                                             X            |          1 |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Hepatocellular Carcinoma             |                                                                          |          1 |
      Leukemia Mononuclear                 |    X     X     X              X  X  X  X     X  X     X     X     X      |         29 |
                                            __________________________________________________________________________|____________|
   Mesentery                               |       +        +                    +        +     +                     |  10        |
      Leukemia Mononuclear                 |                                                                          |          2 |
      Mesothelioma NOS                     |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X                                                                     |          2 |
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X                                                                     |          1 |
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X                                                                     |          1 |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                                                                          |          3 |
      Mesothelioma NOS, Metastatic, Testes |                            X                                             |          1 |
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Pheochromocytoma Benign              |                                                                          |          2 |
      Bilateral, Pheochromocytoma Benign   |                                           X                              |          2 |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Adenoma                              |                                                                          |          1 |
      Carcinoma                            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X                                                                     |          3 |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  31                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 4| 5| 7| 4| 7| 5| 4| 5| 5| 7| 6| 7| 6| 7| 6| 7| 6| 5| 6| 7| 7| 7|     |            |
                             DAY ON TEST   | 3| 1| 2| 3| 7| 0| 3| 9| 9| 1| 0| 8| 3| 7| 3| 7| 3| 8| 4| 0| 3| 3| 3|     |            |
                                           | 3| 8| 0| 3| 2| 1| 9| 2| 7| 1| 7| 5| 3| 9| 3| 4| 3| 4| 6| 2| 3| 3| 3|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     A      |
    CONTROL                                | 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5|     |     L      |
                                           | 8| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 2| 3| 5| 6| 7| 8| 9| 1| 2| 3| 5| 6|     |            |
 __________________________________________________________________________________________________________________________________ 
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
                                           |                                                                          |            |
      Pars Distalis, Adenoma               | X     X  X  X  X  X     X        X     X           X     X        X      |         25 |
      Pars Intermedia, Adenoma             |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      C-Cell, Adenoma                      |                                           X     X                        |          6 |
      C-Cell, Carcinoma                    |                            X                       X                     |          3 |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Mesothelioma NOS                     |                      X     X                                             |          3 |
                                            __________________________________________________________________________|____________|
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Carcinoma                            |             X              X                                             |          5 |
                                            __________________________________________________________________________|____________|
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Bilateral, Mesothelioma NOS          |                      X     X                                             |          3 |
      Bilateral, Interstitial Cell, Adenoma| X              X     X        X     X     X  X  X           X  X  X      |         25 |
      Interstitial Cell, Adenoma           |                                  X                 X  X                  |          8 |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X           X                             X  X     X                  |         14 |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |    +              +              +                    +                  |  12        |
      Lumbar, Leukemia Mononuclear         |                                                                          |          2 |
      Pancreatic, Leukemia Mononuclear     |                                  X                    X                  |          5 |
      Renal, Leukemia Mononuclear          |    X                                                  X                  |          5 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | +  +  +  M  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  M  +  +      |  41        |
      Leukemia Mononuclear                 |    X           X                             X  X     X                  |         17 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  M  +  +  +  +  M  +  +  +  +  +  +  M  +  +      |  43        |
      Leukemia Mononuclear                 |    X                                X        X  X     X                  |         18 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X                             X           X  X     X                  |         15 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X           X                 X           X  X     X           X      |         20 |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X     X     X              X  X  X  X     X  X     X     X     X      |         29 |
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  32                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 4| 5| 7| 4| 7| 5| 4| 5| 5| 7| 6| 7| 6| 7| 6| 7| 6| 5| 6| 7| 7| 7|     |            |
                             DAY ON TEST   | 3| 1| 2| 3| 7| 0| 3| 9| 9| 1| 0| 8| 3| 7| 3| 7| 3| 8| 4| 0| 3| 3| 3|     |            |
                                           | 3| 8| 0| 3| 2| 1| 9| 2| 7| 1| 7| 5| 3| 9| 3| 4| 3| 4| 6| 2| 3| 3| 3|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     A      |
    CONTROL                                | 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5|     |     L      |
                                           | 8| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 2| 3| 5| 6| 7| 8| 9| 1| 2| 3| 5| 6|     |            |
 __________________________________________________________________________________________________________________________________ 
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
      Leukemia Mononuclear                 |    X           X                                X     X           X      |         10 |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Fibroma                              |                                                          X  X            |          3 |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Rib, Osteosarcoma                    |                                                                   X      |          1 |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Glioma Malignant                     |                      X                                                   |          1 |
                                            __________________________________________________________________________|____________|
   Peripheral Nerve                        |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Spinal Cord                             |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Alveolar/Bronchiolar Adenoma         |                                                                          |          1 |
      Alveolar/Bronchiolar Carcinoma       |          X                                                               |          1 |
      Leukemia Mononuclear                 |    X           X                 X           X  X     X                  |         16 |
      Mesothelioma NOS, Metastatic, Testes |                            X                                             |          1 |
      Neoplasm NOS, Metastatic, Uncertain  |                                                                          |            |
          Primary Site                     |                                                                          |          1 |
      Osteosarcoma, Metastatic, Bone       |                                                                   X      |          1 |
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Ear                                     |                      +                                                   |   2        |
      Pinna, Schwannoma Benign             |                      X                                                   |          1 |
                                            __________________________________________________________________________|____________|
   Eye                                     |                                        +                                 |   1        |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X                                                                     |          2 |
      Renal Tubule, Adenoma                |                                           X                              |          1 |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  33                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 4| 5| 7| 4| 7| 5| 4| 5| 5| 7| 6| 7| 6| 7| 6| 7| 6| 5| 6| 7| 7| 7|     |            |
                             DAY ON TEST   | 3| 1| 2| 3| 7| 0| 3| 9| 9| 1| 0| 8| 3| 7| 3| 7| 3| 8| 4| 0| 3| 3| 3|     |            |
                                           | 3| 8| 0| 3| 2| 1| 9| 2| 7| 1| 7| 5| 3| 9| 3| 4| 3| 4| 6| 2| 3| 3| 3|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     A      |
    CONTROL                                | 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5|     |     L      |
                                           | 8| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 2| 3| 5| 6| 7| 8| 9| 1| 2| 3| 5| 6|     |            |
 __________________________________________________________________________________________________________________________________ 
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 __________________________________________________________________________________________________________________________________ 
 SYSTEMIC LESIONS                          |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X     X     X              X  X  X  X     X  X     X     X     X      |         29 |
      Mesothelioma NOS                     |                      X     X                                             |          3 |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  34                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 5| 7| 6| 6| 7| 6| 7| 7| 7| 4| 5| 5| 5| 7| 0| 6| 7| 5| 7| 5| 6| 5| 5| 5| 4|             
                             DAY ON TEST   | 6| 3| 9| 4| 3| 3| 3| 3| 3| 9| 5| 5| 6| 3| 5| 8| 1| 2| 3| 9| 2| 3| 6| 9| 4|             
                                           | 0| 3| 3| 2| 3| 7| 3| 3| 3| 6| 8| 5| 4| 3| 6| 8| 8| 5| 3| 5| 3| 0| 7| 0| 6|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    100 PPM                                | 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4|             
                                           | 3| 4| 5| 7| 8| 9| 0| 1| 2| 3| 4| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  A  A  +  +  +     +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  A  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  A  A  +  +  +     +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  A  +  +  +  +     +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Hepatocellular Adenoma               |                                                             X            |             
      Leukemia Mononuclear                 |    X  X  X     X  X  X           X  X        X  X     X  X  X  X     X   |             
                                            __________________________________________________________________________|             
   Mesentery                               |    +     +                                      +     +                  |             
      Leukemia Mononuclear                 |          X                                                               |             
      Mesothelioma NOS                     |                                                                          |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |          X                                                               |             
                                            __________________________________________________________________________|             
   Pharynx                                 |                                                       +                  |             
      Squamous Cell Papilloma              |                                                       X                  |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                              X                           |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +   |             
      Leukemia Mononuclear                 |                                              X                           |             
                                            __________________________________________________________________________|             
   Tongue                                  |                                                                          |             
      Squamous Cell Carcinoma              |                                                                          |             
                                            __________________________________________________________________________|             
   Tooth                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  M  +|             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  M  +  +  +  +  +|             
      Pheochromocytoma Malignant           |                                                                          |             
      Pheochromocytoma Benign              |       X  X     X                                                         |             
      Bilateral, Pheochromocytoma Benign   |                      X                          X                        |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |          X                                                               |             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  I  +  +  +  +  +|             
      Pars Distalis, Adenoma               | X  X     X  X        X  X     X        X        X  X  X     X            |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Adenoma                      |    X                 X                       X     X                     |             
      C-Cell, Carcinoma                    |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  35                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 5| 7| 6| 6| 7| 6| 7| 7| 7| 4| 5| 5| 5| 7| 0| 6| 7| 5| 7| 5| 6| 5| 5| 5| 4|             
                             DAY ON TEST   | 6| 3| 9| 4| 3| 3| 3| 3| 3| 9| 5| 5| 6| 3| 5| 8| 1| 2| 3| 9| 2| 3| 6| 9| 4|             
                                           | 0| 3| 3| 2| 3| 7| 3| 3| 3| 6| 8| 5| 4| 3| 6| 8| 8| 5| 3| 5| 3| 0| 7| 0| 6|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    100 PPM                                | 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4|             
                                           | 3| 4| 5| 7| 8| 9| 0| 1| 2| 3| 4| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
                                           |                                                                          |             
      Follicular Cell, Adenoma             |             X                                                            |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Mesothelioma NOS                     |                      X                                                   |             
                                            __________________________________________________________________________|             
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Carcinoma                            |                                                                   X      |             
                                            __________________________________________________________________________|             
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +     M  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Mesothelioma NOS                     |                      X                                                   |             
      Bilateral, Mesothelioma NOS          |                                                                          |             
      Bilateral, Interstitial Cell, Adenoma|    X  X     X  X  X  X  X  X     X  X  X     X  X     X        X         |             
      Interstitial Cell, Adenoma           |                               X                          X        X     X|             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood                                   |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |          X           X           X  X        X  X        X  X  X         |             
                                            __________________________________________________________________________|             
   Lymph Node                              |                +                             +  +           +     +      |             
      Lumbar, Leukemia Mononuclear         |                X                             X                           |             
      Pancreatic, Leukemia Mononuclear     |                                                             X            |             
      Renal, Leukemia Mononuclear          |                                                 X                        |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | M  +  +  +  +  +  +  +  +  +  +  M  +  +     +  +  +  +  M  M  +  +  M  +|             
      Leukemia Mononuclear                 |    X  X  X     X  X  X              X        X  X              X         |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  +  +  +  M  +  M  +  +  M  +  +     +  +  +  +  M  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X  X     X     X              X        X  X           X  X         |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X  X     X  X  X              X        X  X        X  X  X         |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X  X     X  X  X           X  X        X  X           X  X         |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X  X     X  X  X           X  X        X  X     X  X  X  X     X   |             
      Sarcoma                              |                                                       X                  |             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                X                 X           X                 X         |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Fibroadenoma                         |                      X                                                   |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  36                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 5| 7| 6| 6| 7| 6| 7| 7| 7| 4| 5| 5| 5| 7| 0| 6| 7| 5| 7| 5| 6| 5| 5| 5| 4|             
                             DAY ON TEST   | 6| 3| 9| 4| 3| 3| 3| 3| 3| 9| 5| 5| 6| 3| 5| 8| 1| 2| 3| 9| 2| 3| 6| 9| 4|             
                                           | 0| 3| 3| 2| 3| 7| 3| 3| 3| 6| 8| 5| 4| 3| 6| 8| 8| 5| 3| 5| 3| 0| 7| 0| 6|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    100 PPM                                | 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4|             
                                           | 3| 4| 5| 7| 8| 9| 0| 1| 2| 3| 4| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM - cont               |                                                                          |             
                                           |                                                                          |             
      Basal Cell Adenoma                   |                                                                          |             
      Fibroma                              |                                                                          |             
      Fibrosarcoma                         |                                                                          |             
      Keratoacanthoma                      |                                                 X                        |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Oligodendroglioma NOS                |                                                                         X|             
      Sarcoma, Metastatic, Spleen          |                                                       X                  |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Alveolar/Bronchiolar Adenoma         |                                                                          |             
      Alveolar/Bronchiolar Carcinoma       |                                                                          |             
      Leukemia Mononuclear                 |    X  X  X     X  X  X           X  X        X  X     X  X  X  X         |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |          X                                                               |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                              X                           |             
 _____________________________________________________________________________________________________________________|             
 SYSTEMIC LESIONS                          |                                                                          |             
                                            __________________________________________________________________________|             
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X  X     X  X  X           X  X        X  X     X  X  X  X     X   |             
      Mesothelioma NOS                     |                      X                                                   |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  37                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 5| 7| 5| 6| 6| 7| 7| 3| 7| 6| 7| 7| 7| 6| 7| 5| 7| 5| 6| 5| 5| 7|     |            |
                             DAY ON TEST   | 3| 8| 0| 8| 3| 8| 0| 2| 3| 3| 6| 2| 3| 3| 6| 3| 1| 3| 8| 5| 5| 6| 3|     |            |
                                           | 3| 6| 1| 6| 9| 9| 7| 1| 1| 3| 5| 3| 3| 3| 5| 3| 7| 2| 8| 3| 9| 1| 3|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|     |     A      |
    100 PPM                                | 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6|     |     L      |
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 2| 3| 5| 7|     |            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +      |  42        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +      |  44        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  A  +  M  +  +      |  43        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +      |  45        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +      |  42        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  A  +  A  +  +  +  +      |  42        |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Hepatocellular Adenoma               |                                                                          |          1 |
      Leukemia Mononuclear                 | X  X  X  X  X     X  X        X  X     X  X  X        X  X  X  X  X      |         32 |
                                            __________________________________________________________________________|____________|
   Mesentery                               |          +  +                    +        +     +                        |   9        |
      Leukemia Mononuclear                 |                                                                          |          1 |
      Mesothelioma NOS                     |                                           X                              |          1 |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Leukemia Mononuclear                 |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Pharynx                                 |                                                                          |   1        |
      Squamous Cell Papilloma              |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Leukemia Mononuclear                 |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
      Leukemia Mononuclear                 |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Tongue                                  |                            +                       +                     |   2        |
      Squamous Cell Carcinoma              |                                                    X                     |          1 |
                                            __________________________________________________________________________|____________|
   Tooth                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
      Pheochromocytoma Malignant           |                                                             X            |          1 |
      Pheochromocytoma Benign              |                      X        X  X           X     X  X  X               |         10 |
      Bilateral, Pheochromocytoma Benign   | X              X                                                         |          4 |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Adenoma                              |                      X                       X              X            |          4 |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +      |  46        |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  38                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 5| 7| 5| 6| 6| 7| 7| 3| 7| 6| 7| 7| 7| 6| 7| 5| 7| 5| 6| 5| 5| 7|     |            |
                             DAY ON TEST   | 3| 8| 0| 8| 3| 8| 0| 2| 3| 3| 6| 2| 3| 3| 6| 3| 1| 3| 8| 5| 5| 6| 3|     |            |
                                           | 3| 6| 1| 6| 9| 9| 7| 1| 1| 3| 5| 3| 3| 3| 5| 3| 7| 2| 8| 3| 9| 1| 3|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|     |     A      |
    100 PPM                                | 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6|     |     L      |
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 2| 3| 5| 7|     |            |
 __________________________________________________________________________________________________________________________________ 
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
      Pars Distalis, Adenoma               |       X        X  X  X  X  X  X  X     X  X  X  X     X        X  X      |         27 |
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      C-Cell, Adenoma                      |                   X                                                      |          5 |
      C-Cell, Carcinoma                    |                                              X                           |          1 |
      Follicular Cell, Adenoma             |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Mesothelioma NOS                     |             X                             X  X                           |          4 |
                                            __________________________________________________________________________|____________|
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Carcinoma                            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
                                            __________________________________________________________________________|____________|
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Mesothelioma NOS                     |                      X                       X                           |          3 |
      Bilateral, Mesothelioma NOS          |                                           X                              |          1 |
      Bilateral, Interstitial Cell, Adenoma| X  X  X     X     X        X     X  X  X     X     X  X  X        X      |         29 |
      Interstitial Cell, Adenoma           |                      X                                      X            |          6 |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood                                   |                                                                +         |   1        |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Leukemia Mononuclear                 |          X  X     X           X  X           X           X               |         16 |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |                                              +                 +         |   7        |
      Lumbar, Leukemia Mononuclear         |                                                                X         |          3 |
      Pancreatic, Leukemia Mononuclear     |                                                                X         |          2 |
      Renal, Leukemia Mononuclear          |                                              X                           |          2 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | +  +  +  +  +  +  +  +  +  M  +  +  +  +  M  +  +  +  +  +  +  +  +      |  40        |
      Leukemia Mononuclear                 | X  X     X  X     X           X  X     X     X           X  X  X  X      |         23 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  43        |
      Leukemia Mononuclear                 | X  X     X  X     X           X  X     X     X        X  X  X  X  X      |         24 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Leukemia Mononuclear                 | X  X     X  X     X           X  X     X     X           X  X  X         |         24 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +      |  46        |
      Leukemia Mononuclear                 | X  X     X  X     X           X  X     X                 X  X  X  X      |         24 |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  39                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 5| 7| 5| 6| 6| 7| 7| 3| 7| 6| 7| 7| 7| 6| 7| 5| 7| 5| 6| 5| 5| 7|     |            |
                             DAY ON TEST   | 3| 8| 0| 8| 3| 8| 0| 2| 3| 3| 6| 2| 3| 3| 6| 3| 1| 3| 8| 5| 5| 6| 3|     |            |
                                           | 3| 6| 1| 6| 9| 9| 7| 1| 1| 3| 5| 3| 3| 3| 5| 3| 7| 2| 8| 3| 9| 1| 3|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|     |     A      |
    100 PPM                                | 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6|     |     L      |
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 2| 3| 5| 7|     |            |
 __________________________________________________________________________________________________________________________________ 
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Leukemia Mononuclear                 | X  X  X  X  X     X  X        X  X     X  X  X        X  X  X  X  X      |         32 |
      Sarcoma                              |                                                       X                  |          2 |
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  M  +  +  +  +  +  +  +      |  45        |
      Leukemia Mononuclear                 |             X     X           X        X                 X               |          9 |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Fibroadenoma                         |                                              X                           |          2 |
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Basal Cell Adenoma                   |                                        X                                 |          1 |
      Fibroma                              |       X                    X                                             |          2 |
      Fibrosarcoma                         |                                        X                                 |          1 |
      Keratoacanthoma                      |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Oligodendroglioma NOS                |                                                                          |          1 |
      Sarcoma, Metastatic, Spleen          |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  I  +  +      |  46        |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Alveolar/Bronchiolar Adenoma         |                   X                                                      |          1 |
      Alveolar/Bronchiolar Carcinoma       |                            X                                             |          1 |
      Leukemia Mononuclear                 | X  X     X  X     X           X  X     X     X        X  X  X  X  X      |         28 |
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Leukemia Mononuclear                 |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Leukemia Mononuclear                 |                                                                          |          1 |
 __________________________________________________________________________________________________________________________________ 
 SYSTEMIC LESIONS                          |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  
                                                             Page  40                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 5| 7| 5| 6| 6| 7| 7| 3| 7| 6| 7| 7| 7| 6| 7| 5| 7| 5| 6| 5| 5| 7|     |            |
                             DAY ON TEST   | 3| 8| 0| 8| 3| 8| 0| 2| 3| 3| 6| 2| 3| 3| 6| 3| 1| 3| 8| 5| 5| 6| 3|     |            |
                                           | 3| 6| 1| 6| 9| 9| 7| 1| 1| 3| 5| 3| 3| 3| 5| 3| 7| 2| 8| 3| 9| 1| 3|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|     |     A      |
    100 PPM                                | 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6|     |     L      |
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 2| 3| 5| 7|     |            |
 __________________________________________________________________________________________________________________________________ 
 SYSTEMIC LESIONS - cont                   |                                                                          |            |
                                           |                                                                          |            |
      Leukemia Mononuclear                 | X  X  X  X  X     X  X        X  X     X  X  X        X  X  X  X  X      |         32 |
      Mesothelioma NOS                     |             X        X                    X  X                           |          5 |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  41                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 6| 5| 5| 5| 6| 4| 3| 5| 7| 4| 5| 6| 7| 4| 7| 7| 5| 7| 6| 5| 7| 6| 7| 6| 6|             
                             DAY ON TEST   | 2| 7| 6| 2| 5| 9| 7| 0| 3| 4| 6| 9| 1| 8| 3| 3| 8| 0| 4| 9| 3| 8| 3| 9| 6|             
                                           | 2| 3| 1| 5| 3| 7| 1| 7| 3| 2| 0| 8| 9| 3| 3| 3| 3| 7| 4| 7| 3| 4| 3| 1| 5|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    200 PPM                                | 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5|             
                                           | 5| 6| 7| 8| 9| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 0| 1|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoid Tissue, Leukemia Mononuclear|    X                                                                     |             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Peyer's Patch, Leukemia Mononuclear  |    X                                                  X     X            |             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Peyer's Patch, Leukemia Mononuclear  |                                                                          |             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hepatocellular Adenoma               |                                                                          |             
      Leukemia Mononuclear                 |    X  X  X  X  X     X  X  X  X  X  X  X  X     X  X  X  X  X  X  X  X   |             
      Osteosarcoma, Metastatic, Bone       |       X                                                                  |             
                                            __________________________________________________________________________|             
   Mesentery                               |                                  +                          +           +|             
      Leukemia Mononuclear                 |                                  X                                       |             
      Mesothelioma NOS                     |                                                                          |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                                                          |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                                                          |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pheochromocytoma Malignant           | X                                               X                        |             
      Pheochromocytoma Benign              |    X     X  X        X  X        X                 X                 X   |             
      Bilateral, Pheochromocytoma Benign   |                                                                   X      |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |                                                                X         |             
      Adenoma, Multiple                    |                                                                          |             
      Carcinoma                            |                               X                                         X|             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                                                       X                  |             
      Pars Distalis, Adenoma               |          X  X  X  X  X                    X  X              X  X        X|             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  42                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 6| 5| 5| 5| 6| 4| 3| 5| 7| 4| 5| 6| 7| 4| 7| 7| 5| 7| 6| 5| 7| 6| 7| 6| 6|             
                             DAY ON TEST   | 2| 7| 6| 2| 5| 9| 7| 0| 3| 4| 6| 9| 1| 8| 3| 3| 8| 0| 4| 9| 3| 8| 3| 9| 6|             
                                           | 2| 3| 1| 5| 3| 7| 1| 7| 3| 2| 0| 8| 9| 3| 3| 3| 3| 7| 4| 7| 3| 4| 3| 1| 5|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    200 PPM                                | 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5|             
                                           | 5| 6| 7| 8| 9| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 0| 1|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
                                           |                                                                          |             
      Bilateral, C-Cell, Adenoma           |                                                                          |             
      C-Cell, Adenoma                      |    X                                      X                    X         |             
      Follicular Cell, Carcinoma           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Mesothelioma NOS                     |                                                                          |             
                                            __________________________________________________________________________|             
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |                                              X                           |             
      Carcinoma                            |                                                                         X|             
                                            __________________________________________________________________________|             
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Mesothelioma NOS                     |                                                                          |             
      Osteosarcoma, Metastatic, Bone       |       X                                                                  |             
      Bilateral, Mesothelioma NOS          |                                                                          |             
      Bilateral, Interstitial Cell, Adenoma| X  X  X                 X        X  X     X  X  X  X  X  X        X     X|             
      Interstitial Cell, Adenoma           |          X  X                 X                             X  X     X   |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X     X                 X  X  X  X  X        X     X     X  X  X      |             
                                            __________________________________________________________________________|             
   Lymph Node                              |    +  +     +              +  +  +  +                 +                  |             
      Axillary, Leukemia Mononuclear       |                                                       X                  |             
      Axillary, Osteosarcoma, Metastatic,  |                                                                          |             
           Bone                            |       X                                                                  |             
      Deep Cervical, Leukemia Mononuclear  |                                                       X                  |             
      Iliac, Leukemia Mononuclear          |    X                          X                       X                  |             
      Inguinal, Leukemia Mononuclear       |                                                                          |             
      Lumbar, Leukemia Mononuclear         |                                                       X                  |             
      Pancreatic, Leukemia Mononuclear     |             X              X  X  X  X                                    |             
      Renal, Leukemia Mononuclear          |                               X  X                                       |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | +  +  +  +  +  M  M  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X     X  X        X     X  X  X              X     X  X  X  X  X  X   |             
      Osteosarcoma, Metastatic, Bone       |       X                                                                  |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X     X                 X  X  X  X           X  X  X  X  X  X     X   |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X  X  X                 X  X  X           X  X  X  X  X  X  X  X   |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X  X  X              X  X  X  X  X        X  X  X  X  X  X  X  X   |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  43                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 6| 5| 5| 5| 6| 4| 3| 5| 7| 4| 5| 6| 7| 4| 7| 7| 5| 7| 6| 5| 7| 6| 7| 6| 6|             
                             DAY ON TEST   | 2| 7| 6| 2| 5| 9| 7| 0| 3| 4| 6| 9| 1| 8| 3| 3| 8| 0| 4| 9| 3| 8| 3| 9| 6|             
                                           | 2| 3| 1| 5| 3| 7| 1| 7| 3| 2| 0| 8| 9| 3| 3| 3| 3| 7| 4| 7| 3| 4| 3| 1| 5|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    200 PPM                                | 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5|             
                                           | 5| 6| 7| 8| 9| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 0| 1|             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X  X  X  X     X  X  X  X  X  X  X  X     X  X  X  X  X  X  X  X   |             
      Osteosarcoma, Metastatic, Bone       |       X                                                                  |             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X                          X  X                 X  X     X  X         |             
      Thymoma NOS                          |                                              X                           |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma                            |                                                                          |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibroma, Multiple                    |                                                                          |             
      Hemangiopericytoma                   |                                                                          |             
      Trichoepithelioma                    |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Humerus, Osteosarcoma                |       X                                                                  |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Meninges, Meningioma Benign          |                                              X                           |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Alveolar/Bronchiolar Carcinoma       |                   X                                                      |             
      Leukemia Mononuclear                 |    X     X  X        X     X  X  X  X           X  X  X  X  X  X  X  X   |             
      Osteosarcoma, Metastatic, Bone       |       X                                                                  |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                      M                                      +            |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |                               X                       X                  |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Transitional Epithelium, Carcinoma   | X                                                                        |             
 _____________________________________________________________________________________________________________________|             
 SYSTEMIC LESIONS                          |                                                                          |             
                                            __________________________________________________________________________|             
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X  X  X  X     X  X  X  X  X  X  X  X     X  X  X  X  X  X  X  X   |             
      Mesothelioma NOS                     |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  44                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 5| 6| 6| 6| 4| 6| 6| 5| 6| 5| 7| 7| 7| 7| 6| 3| 7| 6| 7| 6| 6|     |            |
                             DAY ON TEST   | 0| 0| 9| 7| 3| 0| 8| 1| 4| 3| 2| 8| 0| 0| 3| 3| 6| 9| 3| 6| 3| 8| 7|     |            |
                                           | 7| 9| 3| 4| 7| 1| 0| 8| 2| 9| 9| 7| 5| 0| 3| 3| 6| 5| 3| 0| 3| 4| 3|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|     |     A      |
    200 PPM                                | 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 8|     |     L      |
                                           | 2| 4| 5| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 0| 1| 2| 3| 4| 5| 6| 0|     |            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  A  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +      |  46        |
      Lymphoid Tissue, Leukemia Mononuclear|                X                                                         |          2 |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  A  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +      |  46        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  A  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +      |  46        |
      Peyer's Patch, Leukemia Mononuclear  |                X           X                                             |          5 |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  A  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +      |  46        |
      Peyer's Patch, Leukemia Mononuclear  |                            X                                             |          1 |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Hepatocellular Adenoma               |                                                                   X      |          1 |
      Leukemia Mononuclear                 |    X     X  X  X  X  X  X  X  X        X        X        X     X  X      |         35 |
      Osteosarcoma, Metastatic, Bone       |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Mesentery                               |                   +        +           +  +           +           +      |   9        |
      Leukemia Mononuclear                 |                            X                                             |          2 |
      Mesothelioma NOS                     |                                           X                              |          1 |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                            X                                             |          1 |
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                            X                                             |          1 |
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                            X                                             |          1 |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Pheochromocytoma Malignant           |                                                                          |          2 |
      Pheochromocytoma Benign              |                               X     X                                    |         10 |
      Bilateral, Pheochromocytoma Benign   |                                                                X         |          2 |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Adenoma                              | X                          X                                   X         |          4 |
      Adenoma, Multiple                    |                                                          X               |          1 |
      Carcinoma                            |                      X                                                   |          3 |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  45                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 5| 6| 6| 6| 4| 6| 6| 5| 6| 5| 7| 7| 7| 7| 6| 3| 7| 6| 7| 6| 6|     |            |
                             DAY ON TEST   | 0| 0| 9| 7| 3| 0| 8| 1| 4| 3| 2| 8| 0| 0| 3| 3| 6| 9| 3| 6| 3| 8| 7|     |            |
                                           | 7| 9| 3| 4| 7| 1| 0| 8| 2| 9| 9| 7| 5| 0| 3| 3| 6| 5| 3| 0| 3| 4| 3|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|     |     A      |
    200 PPM                                | 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 8|     |     L      |
                                           | 2| 4| 5| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 0| 1| 2| 3| 4| 5| 6| 0|     |            |
 __________________________________________________________________________________________________________________________________ 
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +      |  46        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                                                                          |          1 |
      Pars Distalis, Adenoma               | X     X  X  X              X  X  X  X        X     X  X     X     X      |         23 |
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Bilateral, C-Cell, Adenoma           |                                                             X            |          1 |
      C-Cell, Adenoma                      |                               X  X              X                        |          6 |
      Follicular Cell, Carcinoma           |          X                                                               |          1 |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Mesothelioma NOS                     |                                           X                       X      |          2 |
                                            __________________________________________________________________________|____________|
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Adenoma                              |                                                                          |          1 |
      Carcinoma                            |                                                 X                        |          2 |
                                            __________________________________________________________________________|____________|
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Mesothelioma NOS                     |                                                                   X      |          1 |
      Osteosarcoma, Metastatic, Bone       |                                                                          |          1 |
      Bilateral, Mesothelioma NOS          |                                           X                              |          1 |
      Bilateral, Interstitial Cell, Adenoma| X  X  X  X     X     X  X           X  X  X  X  X     X     X  X  X      |         30 |
      Interstitial Cell, Adenoma           |                            X  X                    X     X               |         10 |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |          X     X  X  X  X  X  X        X        X        X     X  X      |         24 |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |                +           +  +     +           +                        |  13        |
      Axillary, Leukemia Mononuclear       |                            X                                             |          2 |
      Axillary, Osteosarcoma, Metastatic,  |                                                                          |            |
           Bone                            |                                                                          |          1 |
      Deep Cervical, Leukemia Mononuclear  |                            X                                             |          2 |
      Iliac, Leukemia Mononuclear          |                            X                    X                        |          5 |
      Inguinal, Leukemia Mononuclear       |                            X                                             |          1 |
      Lumbar, Leukemia Mononuclear         |                            X                                             |          2 |
      Pancreatic, Leukemia Mononuclear     |                X                                X                        |          7 |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  46                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 5| 6| 6| 6| 4| 6| 6| 5| 6| 5| 7| 7| 7| 7| 6| 3| 7| 6| 7| 6| 6|     |            |
                             DAY ON TEST   | 0| 0| 9| 7| 3| 0| 8| 1| 4| 3| 2| 8| 0| 0| 3| 3| 6| 9| 3| 6| 3| 8| 7|     |            |
                                           | 7| 9| 3| 4| 7| 1| 0| 8| 2| 9| 9| 7| 5| 0| 3| 3| 6| 5| 3| 0| 3| 4| 3|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|     |     A      |
    200 PPM                                | 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 8|     |     L      |
                                           | 2| 4| 5| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 0| 1| 2| 3| 4| 5| 6| 0|     |            |
 __________________________________________________________________________________________________________________________________ 
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
      Renal, Leukemia Mononuclear          |                            X  X                 X                        |          5 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  M  M  +  M  M  +      |  40        |
      Leukemia Mononuclear                 |    X     X     X  X  X  X  X  X        X        X        X        X      |         26 |
      Osteosarcoma, Metastatic, Bone       |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  M  +  +  +  M  +  +  +  +  +  +  +  +  +  +  M      |  45        |
      Leukemia Mononuclear                 |          X     X  X     X  X  X        X        X        X     X         |         23 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +      |  47        |
      Leukemia Mononuclear                 |    X     X     X  X  X  X  X  X        X        X        X     X  X      |         28 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X     X     X  X  X  X  X  X        X        X        X     X  X      |         30 |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X     X  X  X  X  X  X  X  X        X        X        X     X  X      |         35 |
      Osteosarcoma, Metastatic, Bone       |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +      |  47        |
      Leukemia Mononuclear                 |                X  X  X     X           X                 X     X  X      |         15 |
      Thymoma NOS                          |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Carcinoma                            |                                                 X                        |          1 |
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Fibroma, Multiple                    | X                                                                        |          1 |
      Hemangiopericytoma                   |    X                                                                     |          1 |
      Trichoepithelioma                    |                                                 X                        |          1 |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Humerus, Osteosarcoma                |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Meninges, Meningioma Benign          |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Alveolar/Bronchiolar Carcinoma       |                                                                          |          1 |
      Leukemia Mononuclear                 |    X     X     X  X  X  X  X  X        X        X        X     X  X      |         29 |
      Osteosarcoma, Metastatic, Bone       |                                                                          |          1 |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  47                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 5| 6| 6| 6| 4| 6| 6| 5| 6| 5| 7| 7| 7| 7| 6| 3| 7| 6| 7| 6| 6|     |            |
                             DAY ON TEST   | 0| 0| 9| 7| 3| 0| 8| 1| 4| 3| 2| 8| 0| 0| 3| 3| 6| 9| 3| 6| 3| 8| 7|     |            |
                                           | 7| 9| 3| 4| 7| 1| 0| 8| 2| 9| 9| 7| 5| 0| 3| 3| 6| 5| 3| 0| 3| 4| 3|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|     |     A      |
    200 PPM                                | 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 8|     |     L      |
                                           | 2| 4| 5| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 0| 1| 2| 3| 4| 5| 6| 0|     |            |
 __________________________________________________________________________________________________________________________________ 
 RESPIRATORY SYSTEM - cont                 |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |                                                    +                     |   2        |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                            X                                             |          3 |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Transitional Epithelium, Carcinoma   |                                                                          |          1 |
 __________________________________________________________________________________________________________________________________ 
 SYSTEMIC LESIONS                          |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |    X     X  X  X  X  X  X  X  X        X        X        X     X  X      |         35 |
      Mesothelioma NOS                     |                                           X                       X      |          2 |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  48                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 5| 6| 6| 7| 7| 6| 7| 7| 7| 6| 7| 6| 4| 6| 7| 6| 6| 7| 7| 7| 6| 7| 7|             
                             DAY ON TEST   | 3| 3| 8| 2| 5| 1| 3| 9| 2| 3| 3| 2| 3| 7| 8| 6| 3| 3| 4| 3| 3| 3| 4| 3| 3|             
                                           | 3| 3| 8| 3| 0| 6| 3| 1| 7| 3| 3| 8| 3| 2| 3| 5| 3| 2| 1| 3| 3| 3| 9| 3| 3|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|             
    400 PPM                                | 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6|             
                                           | 7| 9| 0| 1| 3| 4| 5| 6| 7| 8| 9| 0| 3| 4| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 8|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  A  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  A  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  A  +  +|             
      Carcinoma                            |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  A  +  +|             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hepatocellular Carcinoma             |                         X                                                |             
      Hepatocellular Carcinoma, Multiple   |                                                                          |             
      Hepatocellular Adenoma               |                         X     X                                X         |             
      Leukemia Mononuclear                 | X  X  X     X  X     X  X     X     X  X        X  X  X  X           X   |             
                                            __________________________________________________________________________|             
   Mesentery                               |       +     +  +           +        +           +                        |             
      Leukemia Mononuclear                 |                                                                          |             
      Mesothelioma NOS                     |                            X                                             |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |                                                          X               |             
                                            __________________________________________________________________________|             
   Pharynx                                 |                                                                          |             
      Squamous Cell Papilloma              |                                                                          |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +|             
      Mesothelioma NOS                     |                            X                                             |             
                                            __________________________________________________________________________|             
   Tongue                                  |                                                                          |             
      Squamous Cell Carcinoma              |                                                                          |             
                                            __________________________________________________________________________|             
   Tooth                                   |                   +                                                      |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pheochromocytoma Malignant           |                         X                                                |             
      Pheochromocytoma Benign              |                                        X           X  X           X      |             
      Bilateral, Pheochromocytoma Benign   |                                                                          |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |                                                          X               |             
      Carcinoma                            |                                                 X                        |             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  M  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  M  +|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  I  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pars Distalis, Adenoma               | X  X  X  X  X  X                       X     X  X           X  X     X   |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  49                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 5| 6| 6| 7| 7| 6| 7| 7| 7| 6| 7| 6| 4| 6| 7| 6| 6| 7| 7| 7| 6| 7| 7|             
                             DAY ON TEST   | 3| 3| 8| 2| 5| 1| 3| 9| 2| 3| 3| 2| 3| 7| 8| 6| 3| 3| 4| 3| 3| 3| 4| 3| 3|             
                                           | 3| 3| 8| 3| 0| 6| 3| 1| 7| 3| 3| 8| 3| 2| 3| 5| 3| 2| 1| 3| 3| 3| 9| 3| 3|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|             
    400 PPM                                | 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6|             
                                           | 7| 9| 0| 1| 3| 4| 5| 6| 7| 8| 9| 0| 3| 4| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 8|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Bilateral, C-Cell, Carcinoma         |                                                                      X   |             
      C-Cell, Adenoma                      |                      X  X                       X                       X|             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Mesothelioma NOS                     |                            X                                             |             
                                            __________________________________________________________________________|             
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma                            |                                                                          |             
                                            __________________________________________________________________________|             
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Bilateral, Mesothelioma NOS          |                            X                                             |             
      Bilateral, Interstitial Cell, Adenoma| X  X        X  X  X  X  X  X  X  X  X     X     X  X  X  X  X  X     X  X|             
      Interstitial Cell, Adenoma           |       X  X                                                        X      |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood                                   | +                 +                                                      |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 |    X  X        X                                   X  X                  |             
                                            __________________________________________________________________________|             
   Lymph Node                              |       +              +                 +                          +  +   |             
      Iliac, Leukemia Mononuclear          |                                        X                                 |             
      Pancreatic, Leukemia Mononuclear     |       X                                                              X   |             
      Renal, Leukemia Mononuclear          |                      X                                                   |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  M  M  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 | X  X  X        X     X  X     X                    X  X                  |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 | X  X  X        X     X  X     X        X        X  X  X              X   |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 | X  X  X        X     X  X                          X  X                  |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 | X  X  X        X     X  X     X        X           X  X                  |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibrosarcoma                         |                                                          X               |             
      Leukemia Mononuclear                 | X  X  X     X  X     X  X     X     X  X        X  X  X  X           X   |             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 | X  X  X              X  X                          X                     |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma                            |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  50                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 5| 6| 6| 7| 7| 6| 7| 7| 7| 6| 7| 6| 4| 6| 7| 6| 6| 7| 7| 7| 6| 7| 7|             
                             DAY ON TEST   | 3| 3| 8| 2| 5| 1| 3| 9| 2| 3| 3| 2| 3| 7| 8| 6| 3| 3| 4| 3| 3| 3| 4| 3| 3|             
                                           | 3| 3| 8| 3| 0| 6| 3| 1| 7| 3| 3| 8| 3| 2| 3| 5| 3| 2| 1| 3| 3| 3| 9| 3| 3|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|             
    400 PPM                                | 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6|             
                                           | 7| 9| 0| 1| 3| 4| 5| 6| 7| 8| 9| 0| 3| 4| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 8|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM - cont               |                                                                          |             
                                           |                                                                          |             
      Fibroadenoma                         |                         X                                                |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Basal Cell Adenoma                   |                                                                          |             
      Fibroma                              |                                                                          |             
      Keratoacanthoma                      |                               X                             X            |             
      Sebaceous Gland, Carcinoma           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Astrocytoma NOS                      |                                           X                              |             
      Glioma NOS                           |                                  X                                       |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma, Metastatic, Thyroid Gland |                                                                      X   |             
      Leukemia Mononuclear                 | X     X        X     X  X     X        X           X  X                  |             
      Pheochromocytoma Malignant,          |                                                                          |             
          Metastatic, Adrenal Medulla      |                         X                                                |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                                                 +                        |             
                                            __________________________________________________________________________|             
   Lacrimal Gland                          |                   +                                                      |             
                                            __________________________________________________________________________|             
   Zymbal's Gland                          |                                                                          |             
      Carcinoma                            |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SYSTEMIC LESIONS                          |                                                                          |             
                                            __________________________________________________________________________|             
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Leukemia Mononuclear                 | X  X  X     X  X     X  X     X     X  X        X  X  X  X           X   |             
      Mesothelioma NOS                     |                            X                                             |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  51                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 4| 7| 7| 5| 5| 6| 6| 7| 7| 7| 7| 6| 7| 5| 7| 5| 6| 5| 6| 5| 6| 5|     |            |
                             DAY ON TEST   | 9| 8| 3| 3| 4| 6| 7| 9| 2| 3| 3| 2| 7| 3| 9| 2| 6| 5| 7| 7| 8| 9| 8|     |            |
                                           | 2| 5| 3| 3| 7| 0| 9| 3| 3| 3| 3| 7| 9| 3| 7| 7| 7| 2| 6| 2| 6| 2| 8|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|     |     A      |
    400 PPM                                | 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9|     |     L      |
                                           | 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 2|     |            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +      |  45        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +      |  46        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +      |  44        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +      |  47        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  A  +      |  44        |
      Carcinoma                            |             X                                                            |          1 |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  A  +      |  43        |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Hepatocellular Carcinoma             |                      X                                                   |          2 |
      Hepatocellular Carcinoma, Multiple   |                            X                                             |          1 |
      Hepatocellular Adenoma               |                                                                          |          3 |
      Leukemia Mononuclear                 | X     X  X  X  X  X     X  X  X  X  X  X  X  X        X  X        X      |         32 |
                                            __________________________________________________________________________|____________|
   Mesentery                               |       +           +     +     +                    +                     |  11        |
      Leukemia Mononuclear                 |                         X                                                |          1 |
      Mesothelioma NOS                     |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Adenoma                              |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Pharynx                                 |                            +                                             |   1        |
      Squamous Cell Papilloma              |                            X                                             |          1 |
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Mesothelioma NOS                     |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Tongue                                  |       +                                                                  |   1        |
      Squamous Cell Carcinoma              |       X                                                                  |          1 |
                                            __________________________________________________________________________|____________|
   Tooth                                   |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Pheochromocytoma Malignant           |                                                                          |          1 |
      Pheochromocytoma Benign              | X                 X                                                      |          6 |
      Bilateral, Pheochromocytoma Benign   |                                              X                           |          1 |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  52                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 4| 7| 7| 5| 5| 6| 6| 7| 7| 7| 7| 6| 7| 5| 7| 5| 6| 5| 6| 5| 6| 5|     |            |
                             DAY ON TEST   | 9| 8| 3| 3| 4| 6| 7| 9| 2| 3| 3| 2| 7| 3| 9| 2| 6| 5| 7| 7| 8| 9| 8|     |            |
                                           | 2| 5| 3| 3| 7| 0| 9| 3| 3| 3| 3| 7| 9| 3| 7| 7| 7| 2| 6| 2| 6| 2| 8|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|     |     A      |
    400 PPM                                | 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9|     |     L      |
                                           | 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 2|     |            |
 __________________________________________________________________________________________________________________________________ 
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
                                           |                                                                          |            |
      Adenoma                              |                                                                          |          1 |
      Carcinoma                            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  45        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Pars Distalis, Adenoma               | X  X     X                    X  X        X  X  X  X        X  X         |         23 |
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Bilateral, C-Cell, Carcinoma         |                                                                          |          1 |
      C-Cell, Adenoma                      |                               X                          X               |          6 |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Mesothelioma NOS                     |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Carcinoma                            |    X                                                                     |          1 |
                                            __________________________________________________________________________|____________|
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Bilateral, Mesothelioma NOS          |                                                                          |          1 |
      Bilateral, Interstitial Cell, Adenoma| X     X  X     X  X  X  X  X  X  X  X  X              X  X               |         34 |
      Interstitial Cell, Adenoma           |                                              X  X           X  X  X      |          8 |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood                                   |                                                                          |   2        |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 | X           X     X     X           X                 X                  |         11 |
                                            __________________________________________________________________________|____________|
   Lymph Node                              | +  +        +           +  +                       +              +      |  12        |
      Iliac, Leukemia Mononuclear          |                                                                          |          1 |
      Pancreatic, Leukemia Mononuclear     |                         X                                                |          3 |
      Renal, Leukemia Mononuclear          | X                          X                                      X      |          4 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | +  +  +  +  +  +  +  M  +  +  +  +  M  +  +  +  +  M  M  +  +  +  +      |  41        |
      Leukemia Mononuclear                 | X           X  X  X     X  X                 X           X        X      |         18 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Leukemia Mononuclear                 | X        X  X     X     X  X  X  X  X        X        X  X        X      |         25 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 | X     X     X     X     X  X  X  X  X        X        X  X        X      |         21 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  53                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 4| 7| 7| 5| 5| 6| 6| 7| 7| 7| 7| 6| 7| 5| 7| 5| 6| 5| 6| 5| 6| 5|     |            |
                             DAY ON TEST   | 9| 8| 3| 3| 4| 6| 7| 9| 2| 3| 3| 2| 7| 3| 9| 2| 6| 5| 7| 7| 8| 9| 8|     |            |
                                           | 2| 5| 3| 3| 7| 0| 9| 3| 3| 3| 3| 7| 9| 3| 7| 7| 7| 2| 6| 2| 6| 2| 8|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|     |     A      |
    400 PPM                                | 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9|     |     L      |
                                           | 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 2|     |            |
 __________________________________________________________________________________________________________________________________ 
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
      Leukemia Mononuclear                 | X     X     X  X  X     X  X  X  X     X     X        X  X        X      |         24 |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Fibrosarcoma                         |                                                                          |          1 |
      Leukemia Mononuclear                 | X     X  X  X  X  X     X  X  X  X  X  X  X  X        X  X        X      |         32 |
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 |                   X     X                                X               |          9 |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Carcinoma                            |                               X                                          |          1 |
      Fibroadenoma                         |          X                                                               |          2 |
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Basal Cell Adenoma                   |                                              X                           |          1 |
      Fibroma                              |                X                    X        X                           |          3 |
      Keratoacanthoma                      |                            X           X                                 |          4 |
      Sebaceous Gland, Carcinoma           |                X                                                         |          1 |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Astrocytoma NOS                      |                                                                          |          1 |
      Glioma NOS                           |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Carcinoma, Metastatic, Thyroid Gland |                                                                          |          1 |
      Leukemia Mononuclear                 | X           X  X  X     X  X  X  X           X        X  X        X      |         21 |
      Pheochromocytoma Malignant,          |                                                                          |            |
          Metastatic, Adrenal Medulla      |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |                                                       +                  |   2        |
                                            __________________________________________________________________________|____________|
   Lacrimal Gland                          |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Zymbal's Gland                          |                                           +                              |   1        |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  54                                                               
NTP Experiment-Test: 05133-03                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC                                            ACETONITRILE                                       Date: 03/18/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 15:02:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 4| 7| 7| 5| 5| 6| 6| 7| 7| 7| 7| 6| 7| 5| 7| 5| 6| 5| 6| 5| 6| 5|     |            |
                             DAY ON TEST   | 9| 8| 3| 3| 4| 6| 7| 9| 2| 3| 3| 2| 7| 3| 9| 2| 6| 5| 7| 7| 8| 9| 8|     |            |
                                           | 2| 5| 3| 3| 7| 0| 9| 3| 3| 3| 3| 7| 9| 3| 7| 7| 7| 2| 6| 2| 6| 2| 8|     |            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     O      |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |     T      |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|     |     A      |
    400 PPM                                | 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9|     |     L      |
                                           | 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 2|     |            |
 __________________________________________________________________________________________________________________________________ 
 SPECIAL SENSES SYSTEM - cont              |                                                                          |            |
                                           |                                                                          |            |
      Carcinoma                            |                                           X                              |          1 |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 __________________________________________________________________________________________________________________________________ 
 SYSTEMIC LESIONS                          |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Leukemia Mononuclear                 | X     X  X  X  X  X     X  X  X  X  X  X  X  X        X  X        X      |         32 |
      Mesothelioma NOS                     |                                                                          |          1 |
 __________________________________________________________________________________________________________________________________ 

                         * : Total animals with tissue examined microscopically; total animals with tumor                           
                         + : Tissue examined microscopically                      M : Missing tissue                                
                         X : Lesion present                                       A : Autolysis precludes evaluation                
                         I : Insufficient tissue                              BLANK : Not examined microscopically                  

                                                             Page  55                                                               
                                  ------------------------------------------------------------                                      
                                  ----------              END OF REPORT             ----------                                      
                                  ------------------------------------------------------------                                      
NTP is located at the National Institute of Environmental Health Sciences, part of the National Institutes of Health.