Skip to Main Navigation
Skip to Page Content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it's official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Share This:
https://ntp.niehs.nih.gov/go/3912

TDMS Study 88034-06 Pathology Tables

NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57




       Facility:  Battelle Northwest

       Chemical CAS #:  10028-15-6

       Lock Date:  03/09/93

       Cage Range:  All

       Reasons For Removal:    All

       Removal Date Range:     All

       Treatment Groups:       Include All




































Note:  Animals arranged according to CID number

                                                              Page   1


NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 8| 8| 8| 6| 9| 4| 5| 8| 9| 7| 7| 9| 9| 5| 8| 7| 7| 8| 8| 5| 7| 8| 8| 8|             
                             DAY ON TEST   | 7| 0| 6| 4| 2| 1| 0| 5| 4| 1| 9| 9| 1| 1| 3| 4| 4| 4| 6| 4| 2| 2| 0| 7| 2|             
                                           | 8| 5| 0| 0| 1| 1| 3| 6| 0| 2| 1| 0| 2| 2| 7| 7| 9| 9| 9| 1| 1| 4| 1| 5| 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|             
   B6C3F1 MICE 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   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|             
    CONTROL                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Gallbladder                             | +  +  +  +  +  +  +  +  +  +  +  I  +  +  +  +  +  +  +  A  +  +  +  +  +|             
      Lymphoma Malignant                   | X                                                                        |             
      Sarcoma, Metastatic, Skin            |                                                                   X      |             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  M  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  A  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  A  +  +  +  +  +|             
      Lymphoma Malignant                   |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  A  +  +  +  +  +|             
      Lymphoma Malignant                   |                                                                          |             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hepatocellular Carcinoma             |    X  X                 X                       X     X  X              X|             
      Hepatocellular Carcinoma, Multiple   |                            X                                   X     X   |             
      Hepatocellular Adenoma               |                      X           X                       X     X         |             
      Hepatocellular Adenoma, Multiple     |    X                                                                     |             
      Histiocytic Sarcoma                  |                                              X                          X|             
      Lymphoma Malignant                   | X  X     X                                                               |             
                                            __________________________________________________________________________|             
   Mesentery                               |    +           +                    +                             +      |             
      Lymphoma Malignant                   |                                                                          |             
      Sarcoma, Metastatic, Skin            |                                                                   X      |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Histiocytic Sarcoma                  |                                                                         X|             
      Lymphoma Malignant                   | X  X     X                                                               |             
      Sarcoma, Metastatic, Skin            |                                                                   X      |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |                                                                          |             
      Sarcoma                              |                                                                          |             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Sarcoma, Metastatic, Skin            |                                                                   X      |             
      Squamous Cell Papilloma              |                                                                          |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |                                                                          |             
      Sarcoma, Metastatic, Skin            |                                                                   X      |             
                                            __________________________________________________________________________|             
   Tooth                                   |                                                                          |             
      Adamantinoma Malignant               |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |                                     X                                    |             
 _____________________________________________________________________________________________________________________|             

                                                             Page   2                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 8| 8| 8| 6| 9| 4| 5| 8| 9| 7| 7| 9| 9| 5| 8| 7| 7| 8| 8| 5| 7| 8| 8| 8|             
                             DAY ON TEST   | 7| 0| 6| 4| 2| 1| 0| 5| 4| 1| 9| 9| 1| 1| 3| 4| 4| 4| 6| 4| 2| 2| 0| 7| 2|             
                                           | 8| 5| 0| 0| 1| 1| 3| 6| 0| 2| 1| 0| 2| 2| 7| 7| 9| 9| 9| 1| 1| 4| 1| 5| 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|             
   B6C3F1 MICE 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   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|             
    CONTROL                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
                                           |                                                                          |             
      Capsule, Adenoma                     |                                                          X               |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |                                     X                                    |             
      Pheochromocytoma Benign              |             X              X                                             |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |                                     X                                    |             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  M  +  +  +  +  +  M  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  M|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  I  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pars Distalis, Adenoma               |       X  X                    X     X  X     X  X  X              X  X   |             
      Pars Intermedia, Adenoma             |                         X                                                |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Follicular Cell, Adenoma, Multiple   |                                                    X                     |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  M  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cystadenoma                          |          X                                X                              |             
      Hemangioma                           |                                                                          |             
      Histiocytic Sarcoma                  |                                                                         X|             
      Luteoma                              |                                                                          |             
                                            __________________________________________________________________________|             
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |                                              X                           |             
      Fibroma                              |                                                                          |             
      Hemangioma                           |                                                 X                        |             
      Histiocytic Sarcoma                  |                                              X                          X|             
      Lymphoma Malignant                   | X  X                                                                     |             
      Polyp Stromal                        |    X                                X                                   X|             
      Polyp Stromal, Multiple              |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemangiosarcoma                      |             X                                                            |             
      Histiocytic Sarcoma                  |                                                                         X|             
      Lymphoma Malignant                   |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node                              | +  +     +                 +                 +        +           +     +|             
      Lymphoma Malignant                   |    X     X                                                               |             
      Iliac, Histiocytic Sarcoma           |                                              X                          X|             
      Iliac, Lymphoma Malignant            |    X     X                                                               |             
      Pancreatic, Histiocytic Sarcoma      |                                                                         X|             
      Pancreatic, Lymphoma Malignant       |                                                                          |             
      Renal, Histiocytic Sarcoma           |                                                                         X|             
 _____________________________________________________________________________________________________________________|             

                                                             Page   3                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 8| 8| 8| 6| 9| 4| 5| 8| 9| 7| 7| 9| 9| 5| 8| 7| 7| 8| 8| 5| 7| 8| 8| 8|             
                             DAY ON TEST   | 7| 0| 6| 4| 2| 1| 0| 5| 4| 1| 9| 9| 1| 1| 3| 4| 4| 4| 6| 4| 2| 2| 0| 7| 2|             
                                           | 8| 5| 0| 0| 1| 1| 3| 6| 0| 2| 1| 0| 2| 2| 7| 7| 9| 9| 9| 1| 1| 4| 1| 5| 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|             
   B6C3F1 MICE 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   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|             
    CONTROL                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
                                           |                                                                          |             
      Renal, Lymphoma Malignant            | X        X                                                               |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | +  +  +  +  M  +  +  +  M  +  +  +  +  +  +  +  M  M  +  +  +  +  M  M  M|             
      Histiocytic Sarcoma                  |                                              X                           |             
      Lymphoma Malignant                   | X  X     X                                                               |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  M  +  +  +  M  +  +  M  +  +  +  M  +  +  +  M  +|             
      Histiocytic Sarcoma                  |                                                                         X|             
      Lymphoma Malignant                   |    X     X                                                               |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  M  +  +  +  +  M  +  +  +  +  +  +  +  +  M  +  +  +  +  +|             
      Histiocytic Sarcoma                  |                                                       X                 X|             
      Lymphoma Malignant                   |    X     X                                                               |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  +  +  M  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +|             
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |             
          Metastatic, Lung                 |                                           X                              |             
      Histiocytic Sarcoma                  |                                              X                          X|             
      Lymphoma Malignant                   | X  X     X                                                               |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemangiosarcoma                      |             X                    X                                       |             
      Histiocytic Sarcoma                  |                                                                         X|             
      Lymphoma Malignant                   |    X     X                                                               |             
      Sarcoma, Metastatic, Skin            |                                                                   X      |             
                                            __________________________________________________________________________|             
   Thymus                                  | M  +  M  +  M  +  +  +  M  +  M  +  +  +  +  +  M  +  +  +  +  +  +  +  M|             
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |             
          Metastatic, Lung                 |                                           X                              |             
      Lymphoma Malignant                   |          X                                                               |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |                                                                          |             
      Carcinoma                            |       X                                                                  |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |                                                                          |             
      Subcutaneous Tissue, Hemangiosarcoma |             X                                                            |             
      Subcutaneous Tissue, Histiocytic     |                                                                          |             
          Sarcoma                          |                                                       X                  |             
      Subcutaneous Tissue, Sarcoma         |                                                                          |             
      Subcutaneous Tissue, Sarcoma,        |                                                                          |             
          Multiple                         |                                                                   X      |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Osteosarcoma                         |                   X                                                      |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page   4                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 8| 8| 8| 6| 9| 4| 5| 8| 9| 7| 7| 9| 9| 5| 8| 7| 7| 8| 8| 5| 7| 8| 8| 8|             
                             DAY ON TEST   | 7| 0| 6| 4| 2| 1| 0| 5| 4| 1| 9| 9| 1| 1| 3| 4| 4| 4| 6| 4| 2| 2| 0| 7| 2|             
                                           | 8| 5| 0| 0| 1| 1| 3| 6| 0| 2| 1| 0| 2| 2| 7| 7| 9| 9| 9| 1| 1| 4| 1| 5| 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|             
   B6C3F1 MICE 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   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|             
    CONTROL                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM - cont                     |                                                                          |             
                                           |                                                                          |             
      Carcinoma, Metastatic, Harderian     |                                                                          |             
          Gland                            |                                                 X                        |             
      Histiocytic Sarcoma                  |                                                                         X|             
                                            __________________________________________________________________________|             
   Peripheral Nerve                        |                      +                                                   |             
                                            __________________________________________________________________________|             
   Spinal Cord                             |                      +                                                   |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adamantinoma Malignant, Metastatic,  |                                                                          |             
           Tooth                           |                                                                          |             
      Alveolar/Bronchiolar Adenoma         |                            X                                   X         |             
      Alveolar/Bronchiolar Carcinoma       |                                                                      X   |             
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |             
          Multiple                         |                                           X                 X            |             
      Carcinoma, Metastatic, Harderian     |                                                                          |             
          Gland                            |                                                 X                        |             
      Hepatocellular Carcinoma, Metastatic,|                                                                          |             
           Liver                           |                                                                          |             
      Histiocytic Sarcoma                  |                                                                         X|             
      Lymphoma Malignant                   |    X                                                                     |             
      Osteosarcoma, Metastatic, Bone       |                   X                                                      |             
      Mediastinum, Alveolar/Bronchiolar    |                                                                          |             
          Carcinoma, Metastatic, Lung      |                                           X                 X            |             
      Mediastinum, Lymphoma Malignant      |                                                                          |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma, Metastatic, Harderian     |                                                                          |             
          Gland                            |                                                 X                        |             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Harderian Gland                         |                                                 +           +            |             
      Adenoma                              |                                                             X            |             
      Carcinoma                            |                                                 X                        |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Histiocytic Sarcoma                  |                                                                         X|             
      Lymphoma Malignant                   | X                                                                        |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +|             
      Hemangioma                           |                                                                         X|             
      Lymphoma Malignant                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 SYSTEMIC LESIONS                          |                                                                          |             
                                            __________________________________________________________________________|             
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page   5                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 8| 8| 8| 6| 9| 4| 5| 8| 9| 7| 7| 9| 9| 5| 8| 7| 7| 8| 8| 5| 7| 8| 8| 8|             
                             DAY ON TEST   | 7| 0| 6| 4| 2| 1| 0| 5| 4| 1| 9| 9| 1| 1| 3| 4| 4| 4| 6| 4| 2| 2| 0| 7| 2|             
                                           | 8| 5| 0| 0| 1| 1| 3| 6| 0| 2| 1| 0| 2| 2| 7| 7| 9| 9| 9| 1| 1| 4| 1| 5| 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|             
   B6C3F1 MICE 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   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|             
    CONTROL                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 SYSTEMIC LESIONS - cont                   |                                                                          |             
                                           |                                                                          |             
      Histiocytic Sarcoma                  |                                              X        X                 X|             
      Lymphoma Malignant                   | X  X     X                          X                                    |             
 _____________________________________________________________________________________________________________________|             

                                                             Page   6                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 9| 7| 9| 7| 7| 8| 6| 7| 8| 9| 5| 8| 8| 9| 7| 7| 7| 7| 7| 9| 8| 8| 8| 4| 5|            |
                             DAY ON TEST   | 1| 2| 1| 2| 7| 8| 7| 9| 8| 1| 2| 4| 6| 1| 5| 9| 9| 1| 2| 1| 5| 2| 2| 0| 4|            |
                                           | 1| 1| 2| 1| 5| 4| 8| 1| 3| 1| 7| 9| 5| 2| 4| 1| 6| 7| 2| 2| 7| 6| 4| 8| 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| 0| 0|     O      |
   B6C3F1 MICE 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|     T      |
                               ANIMAL ID   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|     A      |
    CONTROL                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Gallbladder                             | +  +  +  +  A  +  +  +  +  +  +  A  A  +  +  +  +  A  +  +  +  +  +  A  +|  43        |
      Lymphoma Malignant                   |                                                                          |          1 |
      Sarcoma, Metastatic, Skin            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  48        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  47        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  A  +|  45        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  A  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  A  +|  45        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  A  +  +  +  +  +  +  +  A  +  +  +  +  A  +  +  +  +  +  A  +|  44        |
      Lymphoma Malignant                   |                                                       X                  |          1 |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  A  +  +  +  +  +  A  +|  45        |
      Lymphoma Malignant                   |             X                 X                                          |          2 |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  49        |
      Hepatocellular Carcinoma             | X        X                             X  X  X              X     X     X|         15 |
      Hepatocellular Carcinoma, Multiple   |                                     X                                    |          4 |
      Hepatocellular Adenoma               |             X  X              X        X        X              X  X      |         11 |
      Hepatocellular Adenoma, Multiple     |                            X                                             |          2 |
      Histiocytic Sarcoma                  |       X                                                                  |          3 |
      Lymphoma Malignant                   |          X  X  X     X        X                                          |          8 |
                                            __________________________________________________________________________|____________|
   Mesentery                               |       +        +        +  +        +  +  +           +     +            |  13        |
      Lymphoma Malignant                   |                X                                                         |          1 |
      Sarcoma, Metastatic, Skin            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  48        |
      Histiocytic Sarcoma                  |                                                                          |          1 |
      Lymphoma Malignant                   |                      X                                                   |          4 |
      Sarcoma, Metastatic, Skin            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Lymphoma Malignant                   |                X                                                         |          1 |
      Sarcoma                              |                                                    X                     |          1 |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  A  +|  48        |
      Sarcoma, Metastatic, Skin            |                                                                          |          1 |
      Squamous Cell Papilloma              |                            X                                             |          1 |
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  A  +|  48        |
      Lymphoma Malignant                   |                      X                                                   |          1 |
      Sarcoma, Metastatic, Skin            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Tooth                                   |                                                                      +   |   1        |
      Adamantinoma Malignant               |                                                                      X   |          1 |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR 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   7                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 9| 7| 9| 7| 7| 8| 6| 7| 8| 9| 5| 8| 8| 9| 7| 7| 7| 7| 7| 9| 8| 8| 8| 4| 5|            |
                             DAY ON TEST   | 1| 2| 1| 2| 7| 8| 7| 9| 8| 1| 2| 4| 6| 1| 5| 9| 9| 1| 2| 1| 5| 2| 2| 0| 4|            |
                                           | 1| 1| 2| 1| 5| 4| 8| 1| 3| 1| 7| 9| 5| 2| 4| 1| 6| 7| 2| 2| 7| 6| 4| 8| 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| 0| 0|     O      |
   B6C3F1 MICE 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|     T      |
                               ANIMAL ID   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|     A      |
    CONTROL                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 CARDIOVASCULAR SYSTEM - cont              |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  A  +  +  +  +  +  +  +|  48        |
      Lymphoma Malignant                   |                                                                          |          1 |
      Capsule, Adenoma                     |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  A  +  +  +  +  +  +  +|  48        |
      Lymphoma Malignant                   |                                                                          |          1 |
      Pheochromocytoma Benign              |                                                                          |          2 |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  A  M  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  47        |
      Adenoma                              |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | M  +  +  M  M  +  +  M  +  +  +  +  M  +  +  +  M  M  +  M  +  +  +  M  M|  36        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  48        |
      Pars Distalis, Adenoma               | X        X        X     X                             X  X     X  X     X|         19 |
      Pars Intermedia, Adenoma             |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  49        |
      Follicular Cell, Adenoma, Multiple   |          X                                                               |          2 |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  M  M  +  +  +  +  +  +  +  +  +  +  M  +|  45        |
                                            __________________________________________________________________________|____________|
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  49        |
      Cystadenoma                          |    X                                                           X         |          4 |
      Hemangioma                           |                X                                                         |          1 |
      Histiocytic Sarcoma                  |       X                                                                  |          2 |
      Luteoma                              |                X                                                         |          1 |
                                            __________________________________________________________________________|____________|
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  49        |
      Adenoma                              |                                                                          |          1 |
      Fibroma                              |                                           X                              |          1 |
      Hemangioma                           |                                                                          |          1 |
      Histiocytic Sarcoma                  |       X                                                                  |          3 |
      Lymphoma Malignant                   |                      X                                                   |          3 |
      Polyp Stromal                        |                                                                          |          3 |
      Polyp Stromal, Multiple              |                            X                                             |          1 |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  49        |
 __________________________________________________________________________________________________________________________________ 

                         * : 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   8                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 9| 7| 9| 7| 7| 8| 6| 7| 8| 9| 5| 8| 8| 9| 7| 7| 7| 7| 7| 9| 8| 8| 8| 4| 5|            |
                             DAY ON TEST   | 1| 2| 1| 2| 7| 8| 7| 9| 8| 1| 2| 4| 6| 1| 5| 9| 9| 1| 2| 1| 5| 2| 2| 0| 4|            |
                                           | 1| 1| 2| 1| 5| 4| 8| 1| 3| 1| 7| 9| 5| 2| 4| 1| 6| 7| 2| 2| 7| 6| 4| 8| 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| 0| 0|     O      |
   B6C3F1 MICE 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|     T      |
                               ANIMAL ID   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|     A      |
    CONTROL                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
      Hemangiosarcoma                      |                                                                          |          1 |
      Histiocytic Sarcoma                  |       X                                                                  |          2 |
      Lymphoma Malignant                   |          X     X     X        X                                          |          4 |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |             +  +     +        +                 +  +           +         |  15        |
      Lymphoma Malignant                   |                X                                X                        |          4 |
      Iliac, Histiocytic Sarcoma           |                                                                          |          2 |
      Iliac, Lymphoma Malignant            |                X     X        X                    X                     |          6 |
      Pancreatic, Histiocytic Sarcoma      |                                                                          |          1 |
      Pancreatic, Lymphoma Malignant       |                      X                                                   |          1 |
      Renal, Histiocytic Sarcoma           |                                                                          |          1 |
      Renal, Lymphoma Malignant            |             X  X     X        X                 X                        |          7 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | M  +  +  +  +  +  +  +  +  +  +  M  M  +  M  +  +  +  M  M  M  +  +  +  +|  36        |
      Histiocytic Sarcoma                  |                                                                          |          1 |
      Lymphoma Malignant                   |             X  X     X        X                 X  X                     |          9 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  M  +  +  M  +  +  +  +  +  +  +  M  +  +  M  M  A  +  +  +  +  +  M  +|  38        |
      Histiocytic Sarcoma                  |       X                                                                  |          2 |
      Lymphoma Malignant                   |                X     X        X                                          |          5 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  A  +|  45        |
      Histiocytic Sarcoma                  |       X                                                                  |          3 |
      Lymphoma Malignant                   |          X  X  X     X        X                 X                        |          8 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  M  +  +  +  M  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  M  +|  43        |
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |            |
          Metastatic, Lung                 |                                                                          |          1 |
      Histiocytic Sarcoma                  |                                                                          |          2 |
      Lymphoma Malignant                   |             X  X     X        X     X           X  X                     |         10 |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  49        |
      Hemangiosarcoma                      |                                                                          |          2 |
      Histiocytic Sarcoma                  |       X                                                                  |          2 |
      Lymphoma Malignant                   |          X  X  X     X        X                                          |          7 |
      Sarcoma, Metastatic, Skin            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  M  +  +  M  M  +  M  +  +  +  +  +  M  +  +  M  M  +  M  +  +  +|  35        |
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |            |
          Metastatic, Lung                 |                                                                          |          1 |
      Lymphoma Malignant                   |                X                    X           X  X                     |          5 |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Adenoma                              |             X                                                            |          1 |
      Carcinoma                            |                                                          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   9                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 9| 7| 9| 7| 7| 8| 6| 7| 8| 9| 5| 8| 8| 9| 7| 7| 7| 7| 7| 9| 8| 8| 8| 4| 5|            |
                             DAY ON TEST   | 1| 2| 1| 2| 7| 8| 7| 9| 8| 1| 2| 4| 6| 1| 5| 9| 9| 1| 2| 1| 5| 2| 2| 0| 4|            |
                                           | 1| 1| 2| 1| 5| 4| 8| 1| 3| 1| 7| 9| 5| 2| 4| 1| 6| 7| 2| 2| 7| 6| 4| 8| 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| 0| 0|     O      |
   B6C3F1 MICE 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|     T      |
                               ANIMAL ID   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|     A      |
    CONTROL                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 INTEGUMENTARY SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Lymphoma Malignant                   |                                     X                                    |          1 |
      Subcutaneous Tissue, Hemangiosarcoma |                                                                          |          1 |
      Subcutaneous Tissue, Histiocytic     |                                                                          |            |
          Sarcoma                          |                                                                          |          1 |
      Subcutaneous Tissue, Sarcoma         |                                           X                              |          1 |
      Subcutaneous Tissue, Sarcoma,        |                                                                          |            |
          Multiple                         |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Osteosarcoma                         |                                                             X            |          2 |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  49        |
      Carcinoma, Metastatic, Harderian     |                                                                          |            |
          Gland                            |                                                                          |          1 |
      Histiocytic Sarcoma                  |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Peripheral Nerve                        |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Spinal Cord                             |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Adamantinoma Malignant, Metastatic,  |                                                                          |            |
           Tooth                           |                                                                      X   |          1 |
      Alveolar/Bronchiolar Adenoma         |          X                                                               |          3 |
      Alveolar/Bronchiolar Carcinoma       |                                                                          |          1 |
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |            |
          Multiple                         |                                                                          |          2 |
      Carcinoma, Metastatic, Harderian     |                                                                          |            |
          Gland                            |                                                                          |          1 |
      Hepatocellular Carcinoma, Metastatic,|                                                                          |            |
           Liver                           |          X                                   X                           |          2 |
      Histiocytic Sarcoma                  |       X                                                                  |          2 |
      Lymphoma Malignant                   |                      X        X                    X                     |          4 |
      Osteosarcoma, Metastatic, Bone       |                                                                          |          1 |
      Mediastinum, Alveolar/Bronchiolar    |                                                                          |            |
          Carcinoma, Metastatic, Lung      |                                                                          |          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  10                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 9| 7| 9| 7| 7| 8| 6| 7| 8| 9| 5| 8| 8| 9| 7| 7| 7| 7| 7| 9| 8| 8| 8| 4| 5|            |
                             DAY ON TEST   | 1| 2| 1| 2| 7| 8| 7| 9| 8| 1| 2| 4| 6| 1| 5| 9| 9| 1| 2| 1| 5| 2| 2| 0| 4|            |
                                           | 1| 1| 2| 1| 5| 4| 8| 1| 3| 1| 7| 9| 5| 2| 4| 1| 6| 7| 2| 2| 7| 6| 4| 8| 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| 0| 0|     O      |
   B6C3F1 MICE 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|     T      |
                               ANIMAL ID   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|     A      |
    CONTROL                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 RESPIRATORY SYSTEM - cont                 |                                                                          |            |
                                           |                                                                          |            |
      Mediastinum, Lymphoma Malignant      |                                     X                                    |          1 |
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Carcinoma, Metastatic, Harderian     |                                                                          |            |
          Gland                            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  48        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Harderian Gland                         |             +                                +                 +         |   5        |
      Adenoma                              |             X                                X                 X         |          4 |
      Carcinoma                            |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  49        |
      Histiocytic Sarcoma                  |                                                                          |          1 |
      Lymphoma Malignant                   |                      X                                                   |          2 |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|  47        |
      Hemangioma                           |                                                                          |          1 |
      Lymphoma Malignant                   |                X     X                                                   |          2 |
 __________________________________________________________________________________________________________________________________ 
 SYSTEMIC LESIONS                          |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Histiocytic Sarcoma                  |       X                                                                  |          4 |
      Lymphoma Malignant                   |          X  X  X     X        X     X           X  X  X                  |         13 |
 __________________________________________________________________________________________________________________________________ 

                         * : 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  11                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 5| 8| 8| 8| 7| 8| 8| 8| 9| 9| 8| 9| 9| 7| 8| 9| 5| 9| 7| 7| 6| 8| 8| 6| 7|             
                             DAY ON TEST   | 7| 0| 6| 2| 8| 7| 5| 2| 1| 1| 0| 1| 1| 9| 6| 1| 4| 1| 8| 7| 7| 8| 7| 9| 5|             
                                           | 1| 5| 3| 1| 5| 7| 5| 6| 2| 2| 7| 2| 2| 2| 1| 2| 4| 1| 4| 5| 8| 0| 5| 1| 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|             
   B6C3F1 MICE FEMALE                      | 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|             
                               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|             
    0.5 PPM                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Gallbladder                             | +  +  +  +  A  +  M  A  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  A  A|             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  A  +  +  A  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  A  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  A  A|             
      Lymphoma Malignant                   |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  A  A|             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  A  +|             
      Carcinoma                            |                                                 X                        |             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemangiosarcoma                      |    X                                                                     |             
      Hepatocellular Carcinoma             |             X  X     X     X                 X        X                 X|             
      Hepatocellular Carcinoma, Multiple   |                                                                      X   |             
      Hepatocellular Adenoma               |          X  X  X  X  X     X  X                                   X      |             
      Hepatocellular Adenoma, Multiple     |                         X                    X                 X         |             
      Hepatocholangiocarcinoma             |                                                 X                        |             
      Lymphoma Malignant                   |                               X                       X                  |             
      Osteosarcoma, Metastatic, Bone       |                                                                          |             
                                            __________________________________________________________________________|             
   Mesentery                               |             +     +                                      +               |             
      Hemangiosarcoma                      |                   X                                                      |             
      Lymphoma Malignant                   |             X                                            X               |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +|             
      Lymphoma Malignant                   |             X                 X                          X               |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +|             
      Lymphoma Malignant                   |                                                                          |             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |             X                                            X               |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hepatocholangiocarcinoma, Metastatic,|                                                                          |             
           Liver                           |                                                 X                        |             
      Lymphoma Malignant                   |                                                       X                  |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |             X                                                            |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pheochromocytoma Benign              |                         X                                   X            |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  M  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  M  +  M  M  M  M  M  +  M  +  M  M  +  +  +  +  +  +  M  I  +  +  M  +|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  12                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 5| 8| 8| 8| 7| 8| 8| 8| 9| 9| 8| 9| 9| 7| 8| 9| 5| 9| 7| 7| 6| 8| 8| 6| 7|             
                             DAY ON TEST   | 7| 0| 6| 2| 8| 7| 5| 2| 1| 1| 0| 1| 1| 9| 6| 1| 4| 1| 8| 7| 7| 8| 7| 9| 5|             
                                           | 1| 5| 3| 1| 5| 7| 5| 6| 2| 2| 7| 2| 2| 2| 1| 2| 4| 1| 4| 5| 8| 0| 5| 1| 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|             
   B6C3F1 MICE FEMALE                      | 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|             
                               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|             
    0.5 PPM                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
                                           |                                                                          |             
      Pars Distalis, Adenoma               |       X  X                             X     X     X              X  X   |             
      Pars Distalis, Carcinoma             |    X                                                                     |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Follicular Cell, Adenoma             |                                              X                           |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Clitoral Gland                          | +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cystadenoma                          |                                                                         X|             
      Granulosa Cell Tumor Benign          |                                                                          |             
      Luteoma                              |                                                                          |             
      Lymphoma Malignant                   |             X                                                            |             
                                            __________________________________________________________________________|             
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemangiosarcoma                      |                                                                   X      |             
      Lymphoma Malignant                   |             X                 X                                          |             
      Polyp Stromal                        |    X                                   X                                 |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemangiosarcoma                      | X              X  X                                                      |             
                                            __________________________________________________________________________|             
   Lymph Node                              |             +                                         +  +               |             
      Lymphoma Malignant                   |             X                                            X               |             
      Iliac, Lymphoma Malignant            |             X                                         X                  |             
      Pancreatic, Lymphoma Malignant       |             X                                                            |             
      Renal, Lymphoma Malignant            |             X                                         X                  |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | +  M  +  M  +  +  +  M  M  +  +  +  M  +  M  M  +  +  +  +  +  M  M  M  M|             
      Hepatocholangiocarcinoma, Metastatic,|                                                                          |             
           Liver                           |                                                 X                        |             
      Lymphoma Malignant                   |             X                 X                       X  X               |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  I  +  +  +  +  +  +  +  +  +  +  +  M  +  M  +  +  +  +  +  +  M|             
      Lymphoma Malignant                   |             X                 X                       X                  |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |             X                 X              X        X  X               |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  M  M  M  M  +  +  +  +  +  +  +  M  +  M|             
      Hepatocholangiocarcinoma, Metastatic,|                                                                          |             
           Liver                           |                                                 X                        |             
      Lymphoma Malignant                   |             X                 X                       X  X               |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemangiosarcoma                      | X              X                 X                                       |             
      Lymphoma Malignant                   |             X                 X                       X                  |             
                                            __________________________________________________________________________|             
   Thymus                                  | M  +  +  +  +  M  M  +  +  +  +  +  M  +  +  M  +  +  +  +  M  +  M  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  13                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 5| 8| 8| 8| 7| 8| 8| 8| 9| 9| 8| 9| 9| 7| 8| 9| 5| 9| 7| 7| 6| 8| 8| 6| 7|             
                             DAY ON TEST   | 7| 0| 6| 2| 8| 7| 5| 2| 1| 1| 0| 1| 1| 9| 6| 1| 4| 1| 8| 7| 7| 8| 7| 9| 5|             
                                           | 1| 5| 3| 1| 5| 7| 5| 6| 2| 2| 7| 2| 2| 2| 1| 2| 4| 1| 4| 5| 8| 0| 5| 1| 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|             
   B6C3F1 MICE FEMALE                      | 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|             
                               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|             
    0.5 PPM                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
                                           |                                                                          |             
      Lymphoma Malignant                   |             X                 X                       X  X               |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma                            |             X                                                            |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Schwannoma Malignant                 |                                                                          |             
      Subcutaneous Tissue, Hemangiosarcoma | X                                                                        |             
      Subcutaneous Tissue, Sarcoma         |          X                                                               |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Osteosarcoma                         |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma, Metastatic, Pituitary     |                                                                          |             
          Gland                            |    X                                                                     |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Alveolar/Bronchiolar Adenoma         |                                                          X               |             
      Alveolar/Bronchiolar Carcinoma       |                                     X                             X      |             
      Carcinoma, Metastatic, Harderian     |                                                                          |             
          Gland                            |                                                                          |             
      Hepatocellular Carcinoma, Metastatic,|                                                                          |             
           Liver                           |                                                                      X   |             
      Hepatocholangiocarcinoma, Metastatic,|                                                                          |             
           Liver                           |                                                 X                        |             
      Lymphoma Malignant                   |             X                                         X                  |             
      Osteosarcoma, Metastatic, Bone       |                                                                          |             
      Mediastinum, Hemangiosarcoma         |                                                                          |             
      Mediastinum,                         |                                                                          |             
          Hepatocholangiocarcinoma,        |                                                                          |             
          Metastatic, Liver                |                                                 X                        |             
      Mediastinum, Osteosarcoma,           |                                                                          |             
          Metastatic, Bone                 |                                                                          |             
      Mediastinum, Sarcoma, Metastatic,    |                                                                          |             
           Skin                            |          X                                                               |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  14                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 5| 8| 8| 8| 7| 8| 8| 8| 9| 9| 8| 9| 9| 7| 8| 9| 5| 9| 7| 7| 6| 8| 8| 6| 7|             
                             DAY ON TEST   | 7| 0| 6| 2| 8| 7| 5| 2| 1| 1| 0| 1| 1| 9| 6| 1| 4| 1| 8| 7| 7| 8| 7| 9| 5|             
                                           | 1| 5| 3| 1| 5| 7| 5| 6| 2| 2| 7| 2| 2| 2| 1| 2| 4| 1| 4| 5| 8| 0| 5| 1| 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|             
   B6C3F1 MICE FEMALE                      | 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|             
                               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|             
    0.5 PPM                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM - cont              |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Ear                                     |                                                                          |             
                                            __________________________________________________________________________|             
   Harderian Gland                         |                                     +     +                              |             
      Adenoma                              |                                     X     X                              |             
      Carcinoma                            |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hepatocholangiocarcinoma, Metastatic,|                                                                          |             
           Liver                           |                                                 X                        |             
      Lymphoma Malignant                   |             X                                         X  X               |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +|             
      Lymphoma Malignant                   |             X                 X                                          |             
 _____________________________________________________________________________________________________________________|             
 SYSTEMIC LESIONS                          |                                                                          |             
                                            __________________________________________________________________________|             
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |             X                 X              X        X  X               |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  15                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 9| 9| 9| 8| 6| 5| 6| 7| 8| 9| 9| 7| 8| 8| 9| 8| 7| 6| 8| 7| 7| 7| 6| 8|            |
                             DAY ON TEST   | 2| 1| 1| 1| 7| 2| 9| 1| 6| 5| 1| 1| 8| 8| 8| 1| 7| 5| 2| 1| 6| 9| 2| 1| 5|            |
                                           | 6| 2| 2| 1| 5| 1| 5| 6| 3| 5| 2| 1| 6| 0| 3| 2| 4| 0| 3| 7| 6| 2| 1| 6| 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| 0| 0|     O      |
   B6C3F1 MICE FEMALE                      | 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|     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| 1| 1|     A      |
    0.5 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Gallbladder                             | +  +  +  +  A  A  +  +  +  +  +  +  A  +  +  +  +  +  +  +  A  A  +  A  +|  38        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  48        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  A  +  +  +  +|  47        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  A  +  +  A  +|  43        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  A  +  +  A  +  +  +  +  M  +  +  +  +  +  M  +  A  +  +  +  +|  41        |
      Lymphoma Malignant                   |                                                 X                        |          1 |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  A  A  +  A  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  42        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  A  A  +  +  +  +  +  +  A  +  +  +  +  +  +  +  A  +  +  +  +|  43        |
      Carcinoma                            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemangiosarcoma                      |                                                                          |          1 |
      Hepatocellular Carcinoma             | X  X  X                 X  X           X     X           X               |         15 |
      Hepatocellular Carcinoma, Multiple   |          X                                                     X         |          3 |
      Hepatocellular Adenoma               |                      X     X              X                             X|         12 |
      Hepatocellular Adenoma, Multiple     |                               X                                          |          4 |
      Hepatocholangiocarcinoma             |                                                                          |          1 |
      Lymphoma Malignant                   |                                           X           X     X        X   |          6 |
      Osteosarcoma, Metastatic, Bone       |                                     X                                    |          1 |
                                            __________________________________________________________________________|____________|
   Mesentery                               |          +                       +                                       |   5        |
      Hemangiosarcoma                      |                                                                          |          1 |
      Lymphoma Malignant                   |                                                                          |          2 |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  48        |
      Lymphoma Malignant                   |                                                                          |          3 |
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  48        |
      Lymphoma Malignant                   |                                                                      X   |          1 |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  49        |
      Lymphoma Malignant                   |                                                                          |          2 |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hepatocholangiocarcinoma, Metastatic,|                                                                          |            |
           Liver                           |                                                                          |          1 |
      Lymphoma Malignant                   |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  49        |
      Lymphoma Malignant                   |                                                                          |          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  16                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 9| 9| 9| 8| 6| 5| 6| 7| 8| 9| 9| 7| 8| 8| 9| 8| 7| 6| 8| 7| 7| 7| 6| 8|            |
                             DAY ON TEST   | 2| 1| 1| 1| 7| 2| 9| 1| 6| 5| 1| 1| 8| 8| 8| 1| 7| 5| 2| 1| 6| 9| 2| 1| 5|            |
                                           | 6| 2| 2| 1| 5| 1| 5| 6| 3| 5| 2| 1| 6| 0| 3| 2| 4| 0| 3| 7| 6| 2| 1| 6| 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| 0| 0|     O      |
   B6C3F1 MICE FEMALE                      | 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|     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| 1| 1|     A      |
    0.5 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  49        |
      Pheochromocytoma Benign              |                                                                          |          2 |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  47        |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  M  M  +  M  +  M  +  +  +  +  +  M  +  M  M  +  +  +  +  M  +  +  M  M|  28        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  A  +  +  +  +|  48        |
      Pars Distalis, Adenoma               |    X  X     X                                            X               |         11 |
      Pars Distalis, Carcinoma             |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  49        |
      Follicular Cell, Adenoma             |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Clitoral Gland                          | +  +  M  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  M  M  +  +  +|  44        |
                                            __________________________________________________________________________|____________|
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  I  +  +|  48        |
      Cystadenoma                          |                                                                         X|          2 |
      Granulosa Cell Tumor Benign          |       X                                                                  |          1 |
      Luteoma                              |                                                                         X|          1 |
      Lymphoma Malignant                   |                                                                         X|          2 |
                                            __________________________________________________________________________|____________|
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemangiosarcoma                      |                                                                          |          1 |
      Lymphoma Malignant                   |                                                                         X|          3 |
      Polyp Stromal                        |                                                                          |          2 |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  49        |
      Hemangiosarcoma                      |                                                                          |          3 |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |                                           +           +              +   |   6        |
      Lymphoma Malignant                   |                                                                          |          2 |
      Iliac, Lymphoma Malignant            |                                           X                          X   |          4 |
      Pancreatic, Lymphoma Malignant       |                                                                          |          1 |
      Renal, Lymphoma Malignant            |                                           X           X              X   |          5 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | M  +  +  I  +  M  M  M  +  +  +  +  +  +  +  +  +  +  +  +  A  +  M  +  +|  32        |
      Hepatocholangiocarcinoma, Metastatic,|                                                                          |            |
           Liver                           |                                                                          |          1 |
      Lymphoma Malignant                   |                                           X     X     X              X  X|          9 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | M  +  I  +  +  M  +  +  M  +  +  +  +  M  +  +  +  +  +  +  A  +  +  +  +|  40        |
      Lymphoma Malignant                   |                                           X     X                    X   |          6 |
 __________________________________________________________________________________________________________________________________ 

                         * : 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  17                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 9| 9| 9| 8| 6| 5| 6| 7| 8| 9| 9| 7| 8| 8| 9| 8| 7| 6| 8| 7| 7| 7| 6| 8|            |
                             DAY ON TEST   | 2| 1| 1| 1| 7| 2| 9| 1| 6| 5| 1| 1| 8| 8| 8| 1| 7| 5| 2| 1| 6| 9| 2| 1| 5|            |
                                           | 6| 2| 2| 1| 5| 1| 5| 6| 3| 5| 2| 1| 6| 0| 3| 2| 4| 0| 3| 7| 6| 2| 1| 6| 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| 0| 0|     O      |
   B6C3F1 MICE FEMALE                      | 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|     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| 1| 1|     A      |
    0.5 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  M  +  +  +|  48        |
      Lymphoma Malignant                   |                                  X        X     X                    X   |          9 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  M  M  +  +  +  M  M  +  +  M  M  +  M  +  +  +  +  +  +  A  +  +  +  +|  36        |
      Hepatocholangiocarcinoma, Metastatic,|                                                                          |            |
           Liver                           |                                                                          |          1 |
      Lymphoma Malignant                   |                                           X     X     X              X  X|          9 |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemangiosarcoma                      |                                                                          |          3 |
      Lymphoma Malignant                   |                                           X     X           X        X   |          7 |
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  I  +  +  +  +  +  M  M  +  +  +  +  +  M  M  +  M  +  A  +  +  +  M|  35        |
      Lymphoma Malignant                   |                                           X                          X   |          6 |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Carcinoma                            |                                                                         X|          2 |
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Schwannoma Malignant                 |                               X                                          |          1 |
      Subcutaneous Tissue, Hemangiosarcoma |          X                                                               |          2 |
      Subcutaneous Tissue, Sarcoma         |                   X                                                      |          2 |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Osteosarcoma                         |                                     X                                    |          1 |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  49        |
      Carcinoma, Metastatic, Pituitary     |                                                                          |            |
          Gland                            |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  49        |
      Alveolar/Bronchiolar Adenoma         |                            X                                         X   |          3 |
      Alveolar/Bronchiolar Carcinoma       |                               X                                   X     X|          5 |
      Carcinoma, Metastatic, Harderian     |                                                                          |            |
          Gland                            |          X                                                               |          1 |
      Hepatocellular Carcinoma, Metastatic,|                                                                          |            |
           Liver                           | X                       X  X           X                                 |          5 |
      Hepatocholangiocarcinoma, Metastatic,|                                                                          |            |
 __________________________________________________________________________________________________________________________________ 

                         * : 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  18                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 9| 9| 9| 8| 6| 5| 6| 7| 8| 9| 9| 7| 8| 8| 9| 8| 7| 6| 8| 7| 7| 7| 6| 8|            |
                             DAY ON TEST   | 2| 1| 1| 1| 7| 2| 9| 1| 6| 5| 1| 1| 8| 8| 8| 1| 7| 5| 2| 1| 6| 9| 2| 1| 5|            |
                                           | 6| 2| 2| 1| 5| 1| 5| 6| 3| 5| 2| 1| 6| 0| 3| 2| 4| 0| 3| 7| 6| 2| 1| 6| 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| 0| 0|     O      |
   B6C3F1 MICE FEMALE                      | 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|     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| 1| 1|     A      |
    0.5 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 RESPIRATORY SYSTEM - cont                 |                                                                          |            |
                                           |                                                                          |            |
           Liver                           |                                                                          |          1 |
      Lymphoma Malignant                   |                                                                      X  X|          4 |
      Osteosarcoma, Metastatic, Bone       |                                     X                                    |          1 |
      Mediastinum, Hemangiosarcoma         |          X                                                               |          1 |
      Mediastinum,                         |                                                                          |            |
          Hepatocholangiocarcinoma,        |                                                                          |            |
          Metastatic, Liver                |                                                                          |          1 |
      Mediastinum, Osteosarcoma,           |                                                                          |            |
          Metastatic, Bone                 |                                     X                                    |          1 |
      Mediastinum, Sarcoma, Metastatic,    |                                                                          |            |
           Skin                            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  48        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Ear                                     |                                        +                                 |   1        |
                                            __________________________________________________________________________|____________|
   Harderian Gland                         |    +     +     +                                                         |   5        |
      Adenoma                              |    X           X                                                         |          4 |
      Carcinoma                            |          X                                                               |          1 |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  49        |
      Hepatocholangiocarcinoma, Metastatic,|                                                                          |            |
           Liver                           |                                                                          |          1 |
      Lymphoma Malignant                   |                                                                      X   |          4 |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  48        |
      Lymphoma Malignant                   |                                                                         X|          3 |
 __________________________________________________________________________________________________________________________________ 
 SYSTEMIC LESIONS                          |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Lymphoma Malignant                   |                                  X        X     X     X     X        X  X|         12 |
 __________________________________________________________________________________________________________________________________ 

                         * : 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: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 8| 8| 8| 5| 9| 6| 9| 6| 7| 9| 5| 9| 5| 6| 7| 8| 6| 6| 7| 7| 7| 8|             
                             DAY ON TEST   | 4| 8| 9| 5| 7| 6| 8| 0| 6| 1| 9| 3| 1| 5| 1| 8| 5| 7| 4| 7| 6| 2| 6| 4| 3|             
                                           | 1| 6| 6| 5| 4| 9| 8| 3| 0| 1| 7| 5| 1| 9| 2| 6| 1| 4| 7| 8| 5| 2| 7| 9| 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|             
   B6C3F1 MICE FEMALE                      | 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|             
                               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|             
    1.0 PPM                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Gallbladder                             | A  +  +  +  +  +  +  +  I  +  +  +  +  +  +  +  +  A  +  +  +  +  A  +  +|             
      Histiocytic Sarcoma                  |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | A  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  A  +  +  +  +  A  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  A  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | A  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Leiomyosarcoma                       |                      X                                                   |             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | A  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  M  +  +  +  +  A  +  +|             
      Lymphoma Malignant                   |       X                                                                  |             
      Peyer's Patch, Histiocytic Sarcoma   |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  A  +  +|             
      Peyer's Patch, Lymphoma Malignant    |                      X                                                   |             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | A  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  A  +  +  +  +  A  +  +|             
      Lymphoma Malignant                   |                                                 X                        |             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemangiosarcoma                      | X                                                                        |             
      Hepatocellular Carcinoma             |                               X     X     X     X                        |             
      Hepatocellular Carcinoma, Multiple   |                                                                          |             
      Hepatocellular Adenoma               |    X              X     X                                         X     X|             
      Hepatocellular Adenoma, Multiple     |             X              X                                             |             
      Histiocytic Sarcoma                  |                                                                          |             
      Lymphoma Malignant                   |       X                          X                                      X|             
                                            __________________________________________________________________________|             
   Mesentery                               |       +                 +  +  +              +                       +  +|             
      Histiocytic Sarcoma                  |                                                                          |             
      Lymphoma Malignant                   |       X                 X     X                                         X|             
                                            __________________________________________________________________________|             
   Oral Mucosa                             |                +                                                         |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |                         X     X                                         X|             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |                               X                                          |             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |                                                                         X|             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Histiocytic Sarcoma                  |                                                                          |             
      Lymphoma Malignant                   |                         X     X                                         X|             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |                                     X                                    |             
      Histiocytic Sarcoma                  |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  20                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 8| 8| 8| 5| 9| 6| 9| 6| 7| 9| 5| 9| 5| 6| 7| 8| 6| 6| 7| 7| 7| 8|             
                             DAY ON TEST   | 4| 8| 9| 5| 7| 6| 8| 0| 6| 1| 9| 3| 1| 5| 1| 8| 5| 7| 4| 7| 6| 2| 6| 4| 3|             
                                           | 1| 6| 6| 5| 4| 9| 8| 3| 0| 1| 7| 5| 1| 9| 2| 6| 1| 4| 7| 8| 5| 2| 7| 9| 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|             
   B6C3F1 MICE FEMALE                      | 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|             
                               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|             
    1.0 PPM                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pheochromocytoma Malignant           |                                                                          |             
      Pheochromocytoma Benign              |                                                                          |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | M  +  +  M  +  +  +  +  M  +  M  +  M  +  +  M  M  +  +  +  +  M  +  M  M|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  I  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pars Distalis, Adenoma               |    X                       X     X        X                             X|             
      Pars Intermedia, Adenoma             |                                     X     X           X                  |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Follicular Cell, Adenoma             |                                           X                              |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Clitoral Gland                          | M  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  I  +  M  +  +  M  M|             
                                            __________________________________________________________________________|             
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cystadenoma                          |                                                                          |             
      Hemangioma                           |                            X                                X            |             
      Histiocytic Sarcoma                  |                                                                X         |             
      Luteoma                              |                                                                          |             
      Lymphoma Malignant                   |                         X     X                                         X|             
                                            __________________________________________________________________________|             
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemangioma                           |                X                                                         |             
      Histiocytic Sarcoma                  |                                                                          |             
      Leiomyoma                            |                                                                          |             
      Lymphoma Malignant                   |                               X                                         X|             
      Polyp Stromal                        | X                                                  X  X        X         |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemangiosarcoma                      |                                                                          |             
      Histiocytic Sarcoma                  |                                                                X         |             
      Lymphoma Malignant                   |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node                              |       +           +     +        +                                       |             
      Lymphoma Malignant                   |                         X                                                |             
      Iliac, Lymphoma Malignant            |       X                 X        X                                       |             
      Pancreatic, Lymphoma Malignant       |                         X                                                |             
      Renal, Histiocytic Sarcoma           |                                                                          |             
      Renal, Lymphoma Malignant            |       X                 X        X                                       |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | M  M  +  +  M  M  +  M  +  +  +  M  M  +  +  M  M  +  +  +  M  M  M  M  +|             
      Histiocytic Sarcoma                  |                                                                          |             
      Lymphoma Malignant                   |       X                 X     X                                         X|             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | M  +  +  +  +  +  +  M  +  +  +  +  M  M  +  M  +  +  +  M  +  M  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  21                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 8| 8| 8| 5| 9| 6| 9| 6| 7| 9| 5| 9| 5| 6| 7| 8| 6| 6| 7| 7| 7| 8|             
                             DAY ON TEST   | 4| 8| 9| 5| 7| 6| 8| 0| 6| 1| 9| 3| 1| 5| 1| 8| 5| 7| 4| 7| 6| 2| 6| 4| 3|             
                                           | 1| 6| 6| 5| 4| 9| 8| 3| 0| 1| 7| 5| 1| 9| 2| 6| 1| 4| 7| 8| 5| 2| 7| 9| 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|             
   B6C3F1 MICE FEMALE                      | 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|             
                               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|             
    1.0 PPM                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
                                           |                                                                          |             
      Lymphoma Malignant                   |       X                 X     X  X                                      X|             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  M  +  +  +  +  +  M  +  +  +  +  +  +  M  +  +  +  +  +  +  +  A  +  +|             
      Histiocytic Sarcoma                  |                                                                          |             
      Lymphoma Malignant                   |       X                 X     X  X                                      X|             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  M  +  M  +  +  M  +  +  +  +  +  +  M  M  +  +  M  +|             
      Histiocytic Sarcoma                  |                                                                          |             
      Lymphoma Malignant                   |       X                 X     X                                         X|             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemangiosarcoma                      |                                     X                                    |             
      Histiocytic Sarcoma                  |                                                                          |             
      Lymphoma Malignant                   |                                  X                                      X|             
                                            __________________________________________________________________________|             
   Thymus                                  | M  M  +  M  M  +  +  M  +  +  +  +  M  +  M  M  +  +  M  +  M  +  +  +  +|             
      Lymphoma Malignant                   |       X                 X     X                                         X|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Carcinoma                            |                                                    X                 X   |             
      Carcinoma, Multiple                  |                                                                          |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Subcutaneous Tissue, Histiocytic     |                                                                          |             
          Sarcoma                          |                                                                          |             
      Subcutaneous Tissue, Sarcoma         |    X                                X                                    |             
      Subcutaneous Tissue, Sarcoma,        |                                                                          |             
          Multiple                         |                                        X                                 |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemangiosarcoma                      |                                                                          |             
                                            __________________________________________________________________________|             
   Skeletal Muscle                         |                                                                          |             
      Histiocytic Sarcoma                  |                                                                          |             
      Rhabdomyosarcoma                     |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Alveolar/Bronchiolar Adenoma         |             X              X        X     X           X  X               |             
      Alveolar/Bronchiolar Adenoma,        |                                                                          |             
          Multiple                         |                X                                                         |             
      Alveolar/Bronchiolar Carcinoma       |                                     X                                    |             
      Hepatocellular Carcinoma, Metastatic,|                                                                          |             
           Liver                           |                               X                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  22                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 8| 8| 8| 5| 9| 6| 9| 6| 7| 9| 5| 9| 5| 6| 7| 8| 6| 6| 7| 7| 7| 8|             
                             DAY ON TEST   | 4| 8| 9| 5| 7| 6| 8| 0| 6| 1| 9| 3| 1| 5| 1| 8| 5| 7| 4| 7| 6| 2| 6| 4| 3|             
                                           | 1| 6| 6| 5| 4| 9| 8| 3| 0| 1| 7| 5| 1| 9| 2| 6| 1| 4| 7| 8| 5| 2| 7| 9| 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|             
   B6C3F1 MICE FEMALE                      | 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|             
                               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|             
    1.0 PPM                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM - cont                 |                                                                          |             
                                           |                                                                          |             
      Histiocytic Sarcoma                  |                                                                X         |             
      Lymphoma Malignant                   |       X                 X     X  X                                      X|             
      Sarcoma, Metastatic, Skin            |                                        X                                 |             
      Mediastinum, Lymphoma Malignant      |                                                                          |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |                                                                          |             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Harderian Gland                         |                +                                                         |             
      Adenoma                              |                                                                          |             
      Carcinoma                            |                X                                                         |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Histiocytic Sarcoma                  |                                                                          |             
      Lymphoma Malignant                   |       X                          X                                       |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  A  +  +|             
      Lymphoma Malignant                   |                                                                         X|             
 _____________________________________________________________________________________________________________________|             
 SYSTEMIC LESIONS                          |                                                                          |             
                                            __________________________________________________________________________|             
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Histiocytic Sarcoma                  |                                                                X         |             
      Lymphoma Malignant                   |       X              X  X     X  X              X                       X|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  23                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 9| 7| 7| 8| 9| 4| 9| 7| 8| 6| 8| 8| 4| 8| 9| 7| 6| 9| 9| 9| 8| 5| 6| 6| 9|            |
                             DAY ON TEST   | 1| 7| 4| 5| 0| 5| 1| 0| 7| 8| 3| 8| 1| 4| 1| 5| 4| 1| 1| 1| 6| 3| 4| 9| 1|            |
                                           | 1| 8| 9| 2| 3| 5| 2| 3| 4| 0| 3| 0| 6| 7| 2| 5| 7| 1| 2| 1| 9| 0| 6| 3| 2|            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 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|     O      |
   B6C3F1 MICE FEMALE                      | 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|     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| 3| 3|     A      |
    1.0 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Gallbladder                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  A  +  +  +|  44        |
      Histiocytic Sarcoma                  |                                                 X                        |          1 |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  46        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  47        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  47        |
      Leiomyosarcoma                       |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  46        |
      Lymphoma Malignant                   |                                                                          |          1 |
      Peyer's Patch, Histiocytic Sarcoma   |                                                 X                        |          1 |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  47        |
      Peyer's Patch, Lymphoma Malignant    |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  46        |
      Lymphoma Malignant                   |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemangiosarcoma                      |             X                                                            |          2 |
      Hepatocellular Carcinoma             |             X              X                                             |          6 |
      Hepatocellular Carcinoma, Multiple   | X                                                                    X   |          2 |
      Hepatocellular Adenoma               |                   X                 X     X              X               |          9 |
      Hepatocellular Adenoma, Multiple     |                                                       X                 X|          4 |
      Histiocytic Sarcoma                  |                      X                          X                        |          2 |
      Lymphoma Malignant                   |    X  X  X              X        X                                       |          8 |
                                            __________________________________________________________________________|____________|
   Mesentery                               |                               +                 +  +                     |  10        |
      Histiocytic Sarcoma                  |                                                 X                        |          1 |
      Lymphoma Malignant                   |                                                    X                     |          5 |
                                            __________________________________________________________________________|____________|
   Oral Mucosa                             |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +|  49        |
      Lymphoma Malignant                   |    X     X                                         X                     |          6 |
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +|  49        |
      Lymphoma Malignant                   |       X  X                                                               |          3 |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Lymphoma Malignant                   |       X                                                                  |          2 |
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  48        |
      Histiocytic Sarcoma                  |                                                 X                        |          1 |
      Lymphoma Malignant                   |       X                                                                  |          4 |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Lymphoma Malignant                   |       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  24                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 9| 7| 7| 8| 9| 4| 9| 7| 8| 6| 8| 8| 4| 8| 9| 7| 6| 9| 9| 9| 8| 5| 6| 6| 9|            |
                             DAY ON TEST   | 1| 7| 4| 5| 0| 5| 1| 0| 7| 8| 3| 8| 1| 4| 1| 5| 4| 1| 1| 1| 6| 3| 4| 9| 1|            |
                                           | 1| 8| 9| 2| 3| 5| 2| 3| 4| 0| 3| 0| 6| 7| 2| 5| 7| 1| 2| 1| 9| 0| 6| 3| 2|            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 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|     O      |
   B6C3F1 MICE FEMALE                      | 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|     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| 3| 3|     A      |
    1.0 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 CARDIOVASCULAR SYSTEM - cont              |                                                                          |            |
                                           |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Adenoma                              |                                                                          |          1 |
      Histiocytic Sarcoma                  |                                                 X                        |          1 |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Pheochromocytoma Malignant           |                                  X                                       |          1 |
      Pheochromocytoma Benign              |                                                       X                  |          1 |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +|  48        |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | M  M  +  M  +  +  +  M  M  M  +  M  +  +  +  +  +  M  +  I  +  +  M  M  +|  29        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Pars Distalis, Adenoma               |             X     X     X  X              X        X                    X|         12 |
      Pars Intermedia, Adenoma             |                                                                          |          3 |
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Follicular Cell, Adenoma             |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Clitoral Gland                          | +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +|  42        |
                                            __________________________________________________________________________|____________|
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cystadenoma                          | X                                                                       X|          2 |
      Hemangioma                           |                                                                          |          2 |
      Histiocytic Sarcoma                  |                                                 X                        |          2 |
      Luteoma                              |                                                       X                  |          1 |
      Lymphoma Malignant                   |       X  X                                         X                     |          6 |
                                            __________________________________________________________________________|____________|
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemangioma                           |                                           X                              |          2 |
      Histiocytic Sarcoma                  |                      X                                                   |          1 |
      Leiomyoma                            |       X                                                                  |          1 |
      Lymphoma Malignant                   |       X                                            X                     |          4 |
      Polyp Stromal                        |                                        X                             X   |          6 |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemangiosarcoma                      |                                                                   X      |          1 |
      Histiocytic Sarcoma                  |                                                                          |          1 |
      Lymphoma Malignant                   |       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  25                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 9| 7| 7| 8| 9| 4| 9| 7| 8| 6| 8| 8| 4| 8| 9| 7| 6| 9| 9| 9| 8| 5| 6| 6| 9|            |
                             DAY ON TEST   | 1| 7| 4| 5| 0| 5| 1| 0| 7| 8| 3| 8| 1| 4| 1| 5| 4| 1| 1| 1| 6| 3| 4| 9| 1|            |
                                           | 1| 8| 9| 2| 3| 5| 2| 3| 4| 0| 3| 0| 6| 7| 2| 5| 7| 1| 2| 1| 9| 0| 6| 3| 2|            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 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|     O      |
   B6C3F1 MICE FEMALE                      | 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|     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| 3| 3|     A      |
    1.0 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |          +           +           +                 +              +      |   9        |
      Lymphoma Malignant                   |                                  X                 X                     |          3 |
      Iliac, Lymphoma Malignant            |          X                       X                 X                     |          6 |
      Pancreatic, Lymphoma Malignant       |                                                                          |          1 |
      Renal, Histiocytic Sarcoma           |                      X                                                   |          1 |
      Renal, Lymphoma Malignant            |          X                       X                                       |          5 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | +  +  +  +  +  +  +  +  +  M  +  M  +  +  +  M  +  +  +  +  +  +  +  M  +|  33        |
      Histiocytic Sarcoma                  |                                                 X                        |          1 |
      Lymphoma Malignant                   |    X  X  X                                         X                     |          8 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  I  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +|  41        |
      Lymphoma Malignant                   |       X  X              X        X                                       |          9 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  M  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  44        |
      Histiocytic Sarcoma                  |                                                 X                        |          1 |
      Lymphoma Malignant                   |       X  X                                         X                     |          8 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | M  +  +  +  M  M  +  +  M  +  +  +  M  +  +  M  +  +  +  +  +  +  +  +  +|  38        |
      Histiocytic Sarcoma                  |                                                 X                        |          1 |
      Lymphoma Malignant                   |    X  X  X                       X                 X                     |          9 |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemangiosarcoma                      |                                                       X           X      |          3 |
      Histiocytic Sarcoma                  |                                                 X                        |          1 |
      Lymphoma Malignant                   |       X  X                       X                 X                     |          6 |
                                            __________________________________________________________________________|____________|
   Thymus                                  | M  +  +  +  M  +  M  +  M  M  +  M  +  +  +  M  +  +  +  +  +  +  +  +  +|  33        |
      Lymphoma Malignant                   |    X  X  X                                         X                     |          8 |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Carcinoma                            |                                                                          |          2 |
      Carcinoma, Multiple                  |                                                             X            |          1 |
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Subcutaneous Tissue, Histiocytic     |                                                                          |            |
          Sarcoma                          |                                                 X                        |          1 |
      Subcutaneous Tissue, Sarcoma         |                X                       X                    X            |          5 |
      Subcutaneous Tissue, Sarcoma,        |                                                                          |            |
          Multiple                         |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemangiosarcoma                      |                                                                   X      |          1 |
                                            __________________________________________________________________________|____________|
   Skeletal Muscle                         |                               +                 +                        |   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  26                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 9| 7| 7| 8| 9| 4| 9| 7| 8| 6| 8| 8| 4| 8| 9| 7| 6| 9| 9| 9| 8| 5| 6| 6| 9|            |
                             DAY ON TEST   | 1| 7| 4| 5| 0| 5| 1| 0| 7| 8| 3| 8| 1| 4| 1| 5| 4| 1| 1| 1| 6| 3| 4| 9| 1|            |
                                           | 1| 8| 9| 2| 3| 5| 2| 3| 4| 0| 3| 0| 6| 7| 2| 5| 7| 1| 2| 1| 9| 0| 6| 3| 2|            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 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|     O      |
   B6C3F1 MICE FEMALE                      | 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|     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| 3| 3|     A      |
    1.0 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 MUSCULOSKELETAL SYSTEM - cont             |                                                                          |            |
                                           |                                                                          |            |
      Histiocytic Sarcoma                  |                                                 X                        |          1 |
      Rhabdomyosarcoma                     |                               X                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Alveolar/Bronchiolar Adenoma         |                X  X                                         X     X      |         10 |
      Alveolar/Bronchiolar Adenoma,        |                                                                          |            |
          Multiple                         |                                                                          |          1 |
      Alveolar/Bronchiolar Carcinoma       |                               X                                          |          2 |
      Hepatocellular Carcinoma, Metastatic,|                                                                          |            |
           Liver                           |                                                                          |          1 |
      Histiocytic Sarcoma                  |                      X                                                   |          2 |
      Lymphoma Malignant                   |    X  X  X              X        X                 X                     |         11 |
      Sarcoma, Metastatic, Skin            |                                                                          |          1 |
      Mediastinum, Lymphoma Malignant      |    X                                                                     |          1 |
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Adenoma                              |                   X                                                      |          1 |
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Harderian Gland                         |                                                          +     +         |   3        |
      Adenoma                              |                                                          X     X         |          2 |
      Carcinoma                            |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Histiocytic Sarcoma                  |                      X                                                   |          1 |
      Lymphoma Malignant                   |       X  X              X        X                                       |          6 |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  I  +  +  +  +  +  +  +  +  +  +  +  +|  46        |
      Lymphoma Malignant                   |       X  X              X                                                |          4 |
 __________________________________________________________________________________________________________________________________ 
 SYSTEMIC LESIONS                          |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Histiocytic Sarcoma                  |                      X                          X                        |          3 |
      Lymphoma Malignant                   |    X  X  X              X        X                 X                     |         13 |
 __________________________________________________________________________________________________________________________________ 

                         * : 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: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 9| 7| 8| 7| 7| 4| 8| 5| 8| 8| 3| 8| 7| 4| 9| 9| 9| 0| 9| 8| 9| 7| 6| 6| 8|             
                             DAY ON TEST   | 1| 8| 8| 7| 0| 5| 0| 7| 0| 0| 9| 0| 6| 8| 1| 0| 1| 9| 1| 4| 1| 4| 9| 9| 4|             
                                           | 2| 1| 3| 8| 1| 4| 7| 8| 7| 5| 1| 7| 7| 2| 1| 1| 2| 5| 2| 5| 1| 9| 3| 4| 7|             
 _____________________________________________________________________________________________________________________|             
                                           | 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|             
   B6C3F1 MICE 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   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
    CONTROL                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Gallbladder                             | +  A  +  +  +  +  +  A  +  +  A  +  +  +  +  +  +  A  M  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | +  A  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  A  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  A  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  A  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  A  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  A  +|             
      Carcinoma                            |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  A  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Cholangiocarcinoma                   |                            X                                             |             
      Hepatocellular Carcinoma             |                X                                X                        |             
      Hepatocellular Carcinoma, Multiple   |    X  X                          X           X                       X  X|             
      Hepatocellular Adenoma               |                                                       X                  |             
      Hepatocellular Adenoma, Multiple     | X                          X                                X            |             
      Histiocytic Sarcoma                  |                         X                                                |             
      Lymphoma Malignant                   |                      X                                                   |             
      Sarcoma, Metastatic, Seminal Vesicle |                                     X                                    |             
      Squamous Cell Carcinoma, Metastatic, |                                                                          |             
           Uncertain Primary Site          |                                                                          |             
      Squamous Cell Carcinoma, Metastatic, |                                                                          |             
           Stomach, Forestomach            |             X                                                            |             
                                            __________________________________________________________________________|             
   Mesentery                               |             +                       +                                    |             
      Sarcoma, Metastatic, Seminal Vesicle |                                     X                                    |             
      Squamous Cell Carcinoma, Metastatic, |                                                                          |             
           Stomach, Forestomach            |             X                                                            |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +|             
      Squamous Cell Carcinoma, Metastatic, |                                                                          |             
           Stomach, Forestomach            |             X                                                            |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |             
          Metastatic, Lung                 |                            X                                             |             
      Carcinoma                            |                                                                          |             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Sarcoma, Metastatic, Seminal Vesicle |                                     X                                    |             
      Squamous Cell Carcinoma              |             X                                                            |             
      Squamous Cell Papilloma              |                                                                          |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Sarcoma, Metastatic, Seminal Vesicle |                                     X                                    |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |             
          Metastatic, Lung                 |                            X                                             |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  28                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 9| 7| 8| 7| 7| 4| 8| 5| 8| 8| 3| 8| 7| 4| 9| 9| 9| 0| 9| 8| 9| 7| 6| 6| 8|             
                             DAY ON TEST   | 1| 8| 8| 7| 0| 5| 0| 7| 0| 0| 9| 0| 6| 8| 1| 0| 1| 9| 1| 4| 1| 4| 9| 9| 4|             
                                           | 2| 1| 3| 8| 1| 4| 7| 8| 7| 5| 1| 7| 7| 2| 1| 1| 2| 5| 2| 5| 1| 9| 3| 4| 7|             
 _____________________________________________________________________________________________________________________|             
                                           | 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|             
   B6C3F1 MICE 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   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
    CONTROL                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM - cont              |                                                                          |             
                                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  A  I  +  +  +  +  +  +|             
      Adenoma                              |                                                 X                        |             
      Sarcoma, Metastatic, Seminal Vesicle |                                     X                                    |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Pheochromocytoma Benign              |                                                       X                  |             
      Sarcoma, Metastatic, Seminal Vesicle |                                     X                                    |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  A  +  M  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  I  +  +  +  +  +|             
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |             
          Metastatic, Lung                 |                            X                                             |             
      Pars Intermedia, Adenoma             |       X                                                                  |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Follicular Cell, Adenoma             |                                                                          |             
      Follicular Cell, Carcinoma           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Histiocytic Sarcoma                  |                         X                                                |             
                                            __________________________________________________________________________|             
   Penis                                   |                +                                         +               |             
                                            __________________________________________________________________________|             
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Histiocytic Sarcoma                  |                         X                                                |             
                                            __________________________________________________________________________|             
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  M  +|             
                                            __________________________________________________________________________|             
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Sarcoma                              |                                     X                                    |             
                                            __________________________________________________________________________|             
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Histiocytic Sarcoma                  |                         X                                                |             
      Interstitial Cell, Adenoma           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |             
          Metastatic, Lung                 |                            X                                             |             
      Hemangiosarcoma                      |                                                                          |             
      Histiocytic Sarcoma                  |                         X                                                |             
                                            __________________________________________________________________________|             
   Lymph Node                              |                      +                 +                                 |             
      Iliac, Lymphoma Malignant            |                      X                                                   |             
      Renal, Lymphoma Malignant            |                      X                                                   |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | +  M  +  M  M  +  +  +  M  M  +  +  +  +  M  M  +  A  +  M  M  M  M  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  29                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 9| 7| 8| 7| 7| 4| 8| 5| 8| 8| 3| 8| 7| 4| 9| 9| 9| 0| 9| 8| 9| 7| 6| 6| 8|             
                             DAY ON TEST   | 1| 8| 8| 7| 0| 5| 0| 7| 0| 0| 9| 0| 6| 8| 1| 0| 1| 9| 1| 4| 1| 4| 9| 9| 4|             
                                           | 2| 1| 3| 8| 1| 4| 7| 8| 7| 5| 1| 7| 7| 2| 1| 1| 2| 5| 2| 5| 1| 9| 3| 4| 7|             
 _____________________________________________________________________________________________________________________|             
                                           | 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|             
   B6C3F1 MICE 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   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
    CONTROL                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
                                           |                                                                          |             
      Lymphoma Malignant                   |                      X                                                   |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | M  M  M  M  +  +  +  +  +  I  +  +  +  M  +  +  +  M  +  +  +  +  M  +  M|             
      Lymphoma Malignant                   |                      X                                                   |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |                      X                                                   |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  M  +  +  +  +  +  +  +  M  M  +  +  +  +  +  A  +  +  +  M  +  +  +|             
      Lymphoma Malignant                   |                      X                                                   |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +|             
      Hemangiosarcoma                      |                                                                          |             
      Lymphoma Malignant                   |                      X                                                   |             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  M  +  +  M  M  +  M  +  +  M  +  +  M  M  +  A  +  M  +  +  +  M  M|             
      Lymphoma Malignant                   |                      X                                                   |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M|             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Subcutaneous Tissue, Hemangiosarcoma |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Skeletal Muscle                         |                            +        +                                    |             
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |             
          Metastatic, Lung                 |                            X                                             |             
      Sarcoma, Metastatic, Seminal Vesicle |                                     X                                    |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Choristoma                           |                                              X                           |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Alveolar/Bronchiolar Adenoma         |                      X        X                             X            |             
      Alveolar/Bronchiolar Adenoma,        |                                                                          |             
          Multiple                         |                                                                          |             
      Alveolar/Bronchiolar Carcinoma       |                                                 X                       X|             
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |             
          Multiple                         |                            X                                             |             
      Carcinoma, Metastatic, Salivary      |                                                                          |             
          Glands                           |                                                                          |             
      Hepatocellular Carcinoma, Metastatic,|                                                                          |             
           Liver                           |    X                                                                     |             
      Mediastinum, Alveolar/Bronchiolar    |                                                                          |             
          Carcinoma, Metastatic, Lung      |                            X                                             |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  30                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 9| 7| 8| 7| 7| 4| 8| 5| 8| 8| 3| 8| 7| 4| 9| 9| 9| 0| 9| 8| 9| 7| 6| 6| 8|             
                             DAY ON TEST   | 1| 8| 8| 7| 0| 5| 0| 7| 0| 0| 9| 0| 6| 8| 1| 0| 1| 9| 1| 4| 1| 4| 9| 9| 4|             
                                           | 2| 1| 3| 8| 1| 4| 7| 8| 7| 5| 1| 7| 7| 2| 1| 1| 2| 5| 2| 5| 1| 9| 3| 4| 7|             
 _____________________________________________________________________________________________________________________|             
                                           | 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|             
   B6C3F1 MICE 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   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
    CONTROL                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM - cont                 |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Histiocytic Sarcoma                  |                         X                                                |             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                   +                                                      |             
                                            __________________________________________________________________________|             
   Harderian Gland                         |          +        +              +     +                    +            |             
      Adenoma                              |          X        X              X     X                                 |             
                                            __________________________________________________________________________|             
   Lacrimal Gland                          |                         +                                                |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +|             
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |             
          Metastatic, Lung                 |                            X                                             |             
      Histiocytic Sarcoma                  |                         X                                                |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  A  +  +  +  +  M  +  +  +  +  A  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SYSTEMIC LESIONS                          |                                                                          |             
                                            __________________________________________________________________________|             
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Histiocytic Sarcoma                  |                         X                                                |             
      Lymphoma Malignant                   |                      X                                                   |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  31                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 3| 9| 3| 9| 8| 9| 8| 8| 9| 9| 6| 7| 8| 7| 9| 7| 7| 9| 9| 6| 8| 3| 9| 9|            |
                             DAY ON TEST   | 2| 8| 1| 2| 1| 8| 1| 4| 1| 1| 1| 0| 2| 1| 9| 1| 0| 2| 1| 1| 6| 6| 9| 1| 0|            |
                                           | 7| 7| 2| 8| 1| 2| 1| 0| 7| 1| 2| 5| 1| 0| 1| 1| 7| 2| 2| 1| 5| 9| 2| 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| 0| 0|     O      |
   B6C3F1 MICE 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|     T      |
                               ANIMAL ID   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     A      |
    CONTROL                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Gallbladder                             | +  +  +  +  +  +  +  M  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  43        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  A  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  45        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  46        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  A  +  A  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  44        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  A  +  A  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  44        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  A  +  A  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  43        |
      Carcinoma                            |                      X                                                   |          1 |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  A  +  A  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  44        |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Cholangiocarcinoma                   |                                                                          |          1 |
      Hepatocellular Carcinoma             |    X                 X                          X                    X  X|          7 |
      Hepatocellular Carcinoma, Multiple   | X        X     X                    X  X  X        X                     |         13 |
      Hepatocellular Adenoma               |             X              X     X     X                    X            |          6 |
      Hepatocellular Adenoma, Multiple     |       X           X                          X                          X|          7 |
      Histiocytic Sarcoma                  |                                                                          |          1 |
      Lymphoma Malignant                   |                                                                          |          1 |
      Sarcoma, Metastatic, Seminal Vesicle |                                                                          |          1 |
      Squamous Cell Carcinoma, Metastatic, |                                                                          |            |
           Uncertain Primary Site          |                                                                      X   |          1 |
      Squamous Cell Carcinoma, Metastatic, |                                                                          |            |
           Stomach, Forestomach            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Mesentery                               |                                              +                           |   3        |
      Sarcoma, Metastatic, Seminal Vesicle |                                                                          |          1 |
      Squamous Cell Carcinoma, Metastatic, |                                                                          |            |
           Stomach, Forestomach            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Squamous Cell Carcinoma, Metastatic, |                                                                          |            |
           Stomach, Forestomach            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |            |
          Metastatic, Lung                 |                                                                          |          1 |
      Carcinoma                            |                                                                   X      |          1 |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Sarcoma, Metastatic, Seminal Vesicle |                                                                          |          1 |
      Squamous Cell Carcinoma              |                                                                          |          1 |
      Squamous Cell Papilloma              |                      X                                               X   |          2 |
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Sarcoma, Metastatic, Seminal Vesicle |                                                                          |          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  32                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 3| 9| 3| 9| 8| 9| 8| 8| 9| 9| 6| 7| 8| 7| 9| 7| 7| 9| 9| 6| 8| 3| 9| 9|            |
                             DAY ON TEST   | 2| 8| 1| 2| 1| 8| 1| 4| 1| 1| 1| 0| 2| 1| 9| 1| 0| 2| 1| 1| 6| 6| 9| 1| 0|            |
                                           | 7| 7| 2| 8| 1| 2| 1| 0| 7| 1| 2| 5| 1| 0| 1| 1| 7| 2| 2| 1| 5| 9| 2| 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| 0| 0|     O      |
   B6C3F1 MICE 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|     T      |
                               ANIMAL ID   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     A      |
    CONTROL                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM - cont                  |                                                                          |            |
                                           |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |            |
          Metastatic, Lung                 |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  47        |
      Adenoma                              |                                                                         X|          2 |
      Sarcoma, Metastatic, Seminal Vesicle |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  48        |
      Pheochromocytoma Benign              |                                                                          |          1 |
      Sarcoma, Metastatic, Seminal Vesicle |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  M  +  M  +  +  +  +  +  +  +  M  +  +  +  +  M  +|  43        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  47        |
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |            |
          Metastatic, Lung                 |                                                                          |          1 |
      Pars Intermedia, Adenoma             |                                  X                                       |          2 |
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Follicular Cell, Adenoma             |                                                                         X|          1 |
      Follicular Cell, Carcinoma           |                                                                X         |          1 |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Histiocytic Sarcoma                  |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Penis                                   |                         +                                +               |   4        |
                                            __________________________________________________________________________|____________|
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Histiocytic Sarcoma                  |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  48        |
                                            __________________________________________________________________________|____________|
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +|  48        |
      Sarcoma                              |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Histiocytic Sarcoma                  |                                                                          |          1 |
      Interstitial Cell, Adenoma           |                                           X              X               |          2 |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC 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  33                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 3| 9| 3| 9| 8| 9| 8| 8| 9| 9| 6| 7| 8| 7| 9| 7| 7| 9| 9| 6| 8| 3| 9| 9|            |
                             DAY ON TEST   | 2| 8| 1| 2| 1| 8| 1| 4| 1| 1| 1| 0| 2| 1| 9| 1| 0| 2| 1| 1| 6| 6| 9| 1| 0|            |
                                           | 7| 7| 2| 8| 1| 2| 1| 0| 7| 1| 2| 5| 1| 0| 1| 1| 7| 2| 2| 1| 5| 9| 2| 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| 0| 0|     O      |
   B6C3F1 MICE 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|     T      |
                               ANIMAL ID   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     A      |
    CONTROL                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |            |
          Metastatic, Lung                 |                                                                          |          1 |
      Hemangiosarcoma                      |                                           X                              |          1 |
      Histiocytic Sarcoma                  |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |                                                                          |   2        |
      Iliac, Lymphoma Malignant            |                                                                          |          1 |
      Renal, Lymphoma Malignant            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | +  +  M  +  +  M  M  +  +  +  +  M  M  +  M  M  +  +  M  M  M  +  +  M  M|  26        |
      Lymphoma Malignant                   |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  +  M  +  M  M  +  M  +  +  +  +  +  +  +  M  +  M  +  M  +  +|  34        |
      Lymphoma Malignant                   |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  48        |
      Lymphoma Malignant                   |                   X                                                      |          2 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  M  +  M  M  +  +  +  +  +  M  +  M  +  +  +  +  +  +  +  M  +  M  +  M|  37        |
      Lymphoma Malignant                   |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Hemangiosarcoma                      |                                           X                              |          1 |
      Lymphoma Malignant                   |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  M  M  M  +  M  +  M  +  +  +  I  +  M  M  +  +  M  +  +  M|  29        |
      Lymphoma Malignant                   |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M|            |
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Subcutaneous Tissue, Hemangiosarcoma |       X                                                                  |          1 |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Skeletal Muscle                         |                                                                          |   2        |
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |            |
          Metastatic, Lung                 |                                                                          |          1 |
      Sarcoma, Metastatic, Seminal Vesicle |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Choristoma                           |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY 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  34                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 3| 9| 3| 9| 8| 9| 8| 8| 9| 9| 6| 7| 8| 7| 9| 7| 7| 9| 9| 6| 8| 3| 9| 9|            |
                             DAY ON TEST   | 2| 8| 1| 2| 1| 8| 1| 4| 1| 1| 1| 0| 2| 1| 9| 1| 0| 2| 1| 1| 6| 6| 9| 1| 0|            |
                                           | 7| 7| 2| 8| 1| 2| 1| 0| 7| 1| 2| 5| 1| 0| 1| 1| 7| 2| 2| 1| 5| 9| 2| 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| 0| 0|     O      |
   B6C3F1 MICE 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|     T      |
                               ANIMAL ID   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     A      |
    CONTROL                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 RESPIRATORY SYSTEM - cont                 |                                                                          |            |
                                           |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Alveolar/Bronchiolar Adenoma         |                         X  X        X                          X         |          7 |
      Alveolar/Bronchiolar Adenoma,        |                                                                          |            |
          Multiple                         |       X                                                                  |          1 |
      Alveolar/Bronchiolar Carcinoma       |                X  X                          X                          X|          6 |
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |            |
          Multiple                         |                                                                      X   |          2 |
      Carcinoma, Metastatic, Salivary      |                                                                          |            |
          Glands                           |                                                                   X      |          1 |
      Hepatocellular Carcinoma, Metastatic,|                                                                          |            |
           Liver                           | X  X     X                                X        X                     |          6 |
      Mediastinum, Alveolar/Bronchiolar    |                                                                          |            |
          Carcinoma, Metastatic, Lung      |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Histiocytic Sarcoma                  |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |             +                                +                           |   3        |
                                            __________________________________________________________________________|____________|
   Harderian Gland                         |             +                                +                           |   7        |
      Adenoma                              |             X                                X                           |          6 |
                                            __________________________________________________________________________|____________|
   Lacrimal Gland                          |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |            |
          Metastatic, Lung                 |                                                                          |          1 |
      Histiocytic Sarcoma                  |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  47        |
 __________________________________________________________________________________________________________________________________ 
 SYSTEMIC LESIONS                          |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Histiocytic Sarcoma                  |                                                                          |          1 |
      Lymphoma Malignant                   |                   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  35                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 9| 7| 8| 6| 9| 6| 6| 6| 4| 9| 8| 9| 9| 8| 5| 7| 7| 6| 7| 7| 9| 7| 9| 6| 9|             
                             DAY ON TEST   | 1| 9| 6| 9| 1| 1| 9| 5| 7| 1| 2| 1| 1| 0| 6| 9| 0| 3| 7| 2| 1| 2| 0| 7| 1|             
                                           | 2| 8| 9| 3| 1| 0| 3| 1| 1| 1| 3| 1| 2| 4| 8| 9| 9| 2| 3| 1| 2| 2| 1| 8| 2|             
 _____________________________________________________________________________________________________________________|             
                                           | 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|             
   B6C3F1 MICE MALE                        | 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|             
                               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|             
    0.5 PPM                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Gallbladder                             | +  +  +  +  +  A  +  +  +  +  M  +  +  +  +  +  +  +  +  A  +  +  +  A  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  A  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  A  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  A  +|             
      Lymphoma Malignant                   |                                                                         X|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  A  +  A  +  +  +  A  +|             
      Carcinoma                            |                                                                          |             
      Lymphoma Malignant                   |                                                       X                 X|             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  A  +|             
      Lymphoma Malignant                   |                                                                         X|             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemangiosarcoma                      |                                           X                              |             
      Hepatocellular Carcinoma             |                X        X        X     X                    X        X   |             
      Hepatocellular Carcinoma, Multiple   |    X                                                                     |             
      Hepatocellular Adenoma               |       X  X           X              X        X     X        X            |             
      Hepatocellular Adenoma, Multiple     | X           X                                                            |             
      Histiocytic Sarcoma                  |                                                 X                        |             
      Lymphoma Malignant                   |                                                                          |             
                                            __________________________________________________________________________|             
   Mesentery                               |                   +                          +                          +|             
      Hemangioma                           |                                                                         X|             
      Hemangiosarcoma                      |                                              X                           |             
                                            __________________________________________________________________________|             
   Oral Mucosa                             |                                                                   +      |             
      Pharyngeal, Squamous Cell Carcinoma  |                                                                   X      |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
      Lymphoma Malignant                   |                                                                         X|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  A  +|             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
      Adenoma                              |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  A  +|             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
      Adenoma                              |                               X                                          |             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | M  M  M  M  M  +  +  +  M  +  +  +  M  +  +  +  +  +  +  M  +  +  M  M  +|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +|             
      Pars Distalis, Adenoma               |                      X                                                   |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  36                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 9| 7| 8| 6| 9| 6| 6| 6| 4| 9| 8| 9| 9| 8| 5| 7| 7| 6| 7| 7| 9| 7| 9| 6| 9|             
                             DAY ON TEST   | 1| 9| 6| 9| 1| 1| 9| 5| 7| 1| 2| 1| 1| 0| 6| 9| 0| 3| 7| 2| 1| 2| 0| 7| 1|             
                                           | 2| 8| 9| 3| 1| 0| 3| 1| 1| 1| 3| 1| 2| 4| 8| 9| 9| 2| 3| 1| 2| 2| 1| 8| 2|             
 _____________________________________________________________________________________________________________________|             
                                           | 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|             
   B6C3F1 MICE MALE                        | 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|             
                               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|             
    0.5 PPM                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  I  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
      Histiocytic Sarcoma                  |                                                 X                        |             
      Sarcoma                              |                                                                          |             
                                            __________________________________________________________________________|             
   Penis                                   |          +                                         +                     |             
                                            __________________________________________________________________________|             
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
      Sarcoma                              |                   X                                                      |             
                                            __________________________________________________________________________|             
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  A  +|             
      Lymphoma Malignant                   |                                                                          |             
                                            __________________________________________________________________________|             
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
                                            __________________________________________________________________________|             
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
      Interstitial Cell, Adenoma           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
      Hemangiosarcoma                      |                                                                          |             
      Lymphoma Malignant                   |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node                              |                                                                         +|             
      Iliac, Lymphoma Malignant            |                                                                         X|             
      Pancreatic, Lymphoma Malignant       |                                                                          |             
      Renal, Lymphoma Malignant            |                                                                         X|             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | M  +  +  +  M  M  M  M  +  +  M  +  M  +  +  M  +  +  +  +  M  M  M  M  +|             
      Lymphoma Malignant                   |                                                                         X|             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | M  +  +  M  +  +  M  I  +  M  +  M  +  +  M  +  M  +  M  +  +  +  +  M  +|             
      Lymphoma Malignant                   |                                                                         X|             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  M  +|             
      Histiocytic Sarcoma                  |                                                 X                        |             
      Lymphoma Malignant                   |                                                       X                 X|             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  +  +  M  +  +  M  +  +  I  +  +  M  +  M  +  +  M  +  +  +  +  A  +|             
      Lymphoma Malignant                   |                                                                         X|             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
      Hemangiosarcoma                      |                                              X                           |             
      Lymphoma Malignant                   |                                                                         X|             
                                            __________________________________________________________________________|             
   Thymus                                  | +  M  M  +  M  +  +  +  +  +  +  +  M  M  M  +  +  M  M  +  +  M  M  A  +|             
      Lymphoma Malignant                   |                                                                         X|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M|             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  37                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 9| 7| 8| 6| 9| 6| 6| 6| 4| 9| 8| 9| 9| 8| 5| 7| 7| 6| 7| 7| 9| 7| 9| 6| 9|             
                             DAY ON TEST   | 1| 9| 6| 9| 1| 1| 9| 5| 7| 1| 2| 1| 1| 0| 6| 9| 0| 3| 7| 2| 1| 2| 0| 7| 1|             
                                           | 2| 8| 9| 3| 1| 0| 3| 1| 1| 1| 3| 1| 2| 4| 8| 9| 9| 2| 3| 1| 2| 2| 1| 8| 2|             
 _____________________________________________________________________________________________________________________|             
                                           | 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|             
   B6C3F1 MICE MALE                        | 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|             
                               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|             
    0.5 PPM                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM - cont               |                                                                          |             
                                           |                                                                          |             
      Subcutaneous Tissue, Hemangiosarcoma |                                                                      X   |             
      Subcutaneous Tissue, Sarcoma         |       X                                                                  |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
      Alveolar/Bronchiolar Adenoma         |                                     X  X        X     X                  |             
      Alveolar/Bronchiolar Carcinoma       |       X     X                                            X  X            |             
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |             
          Multiple                         |          X                                                               |             
      Carcinoma, Metastatic, Harderian     |                                                                          |             
          Gland                            |                            X                                             |             
      Hepatocellular Carcinoma, Metastatic,|                                                                          |             
           Liver                           |                X        X                                                |             
      Histiocytic Sarcoma                  |                                                 X                        |             
      Lymphoma Malignant                   |                                                                          |             
      Mediastinum, Alveolar/Bronchiolar    |                                                                          |             
          Carcinoma, Metastatic, Lung      |       X                                                                  |             
      Mediastinum, Hemangioma              |                                                                          |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                                                                          |             
                                            __________________________________________________________________________|             
   Harderian Gland                         |       +                    +                                   +         |             
      Adenoma                              |                                                                X         |             
      Carcinoma                            |                            X                                             |             
                                            __________________________________________________________________________|             
   Zymbal's Gland                          |                                                 +                        |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
      Histiocytic Sarcoma                  |                                                 X                        |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +|             
      Lymphoma Malignant                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 SYSTEMIC LESIONS                          |                                                                          |             
                                            __________________________________________________________________________|             
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Histiocytic Sarcoma                  |                                                 X                        |             
      Lymphoma Malignant                   |                                                       X                 X|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  38                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 3| 6| 7| 6| 8| 7| 9| 8| 8| 9| 4| 7| 8| 8| 7| 8| 8| 8| 9| 9| 8| 7| 7| 6|            |
                             DAY ON TEST   | 1| 8| 7| 9| 4| 4| 3| 1| 4| 4| 1| 4| 0| 2| 1| 3| 0| 8| 7| 1| 1| 3| 8| 2| 1|            |
                                           | 6| 6| 8| 1| 9| 7| 5| 1| 5| 7| 2| 6| 7| 6| 2| 5| 5| 0| 5| 1| 2| 8| 7| 1| 6|            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 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|     O      |
   B6C3F1 MICE MALE                        | 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|     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| 0| 0|     A      |
    0.5 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Gallbladder                             | +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +|  44        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  47        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +|  48        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +|  45        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +|  45        |
      Lymphoma Malignant                   |    X                                                                     |          2 |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +|  44        |
      Carcinoma                            |                                                    X                     |          1 |
      Lymphoma Malignant                   |                                                                          |          2 |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +|  45        |
      Lymphoma Malignant                   |    X                                                                     |          2 |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemangiosarcoma                      |                                                                          |          1 |
      Hepatocellular Carcinoma             |       X  X  X  X                 X  X                 X        X         |         14 |
      Hepatocellular Carcinoma, Multiple   |                                                                   X  X   |          3 |
      Hepatocellular Adenoma               | X  X                       X                             X              X|         12 |
      Hepatocellular Adenoma, Multiple     |                               X        X        X  X                     |          6 |
      Histiocytic Sarcoma                  |                                                                          |          1 |
      Lymphoma Malignant                   |    X                                                                     |          1 |
                                            __________________________________________________________________________|____________|
   Mesentery                               |                                                                          |   3        |
      Hemangioma                           |                                                                          |          1 |
      Hemangiosarcoma                      |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Oral Mucosa                             |                                                                          |   1        |
      Pharyngeal, Squamous Cell Carcinoma  |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Lymphoma Malignant                   |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  47        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Lymphoma Malignant                   |    X                                                                     |          1 |
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Adenoma                              |                                                                X         |          1 |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  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  39                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 3| 6| 7| 6| 8| 7| 9| 8| 8| 9| 4| 7| 8| 8| 7| 8| 8| 8| 9| 9| 8| 7| 7| 6|            |
                             DAY ON TEST   | 1| 8| 7| 9| 4| 4| 3| 1| 4| 4| 1| 4| 0| 2| 1| 3| 0| 8| 7| 1| 1| 3| 8| 2| 1|            |
                                           | 6| 6| 8| 1| 9| 7| 5| 1| 5| 7| 2| 6| 7| 6| 2| 5| 5| 0| 5| 1| 2| 8| 7| 1| 6|            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 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|     O      |
   B6C3F1 MICE MALE                        | 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|     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| 0| 0|     A      |
    0.5 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Adenoma                              |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  M  +  +  M  +  M  M  +  +  +  +  +  +  +  +  +  M  M  +  M  +  M  +|  32        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Pars Distalis, Adenoma               |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  48        |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Histiocytic Sarcoma                  |                                                                          |          1 |
      Sarcoma                              |                      X                                                   |          1 |
                                            __________________________________________________________________________|____________|
   Penis                                   |                                                                          |   2        |
                                            __________________________________________________________________________|____________|
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Sarcoma                              |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +|  47        |
      Lymphoma Malignant                   |    X                                                                     |          1 |
                                            __________________________________________________________________________|____________|
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Interstitial Cell, Adenoma           |                         X                                                |          1 |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Hemangiosarcoma                      |                                                    X              X      |          2 |
      Lymphoma Malignant                   |    X                                                                     |          1 |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |    +                                                           +         |   3        |
      Iliac, Lymphoma Malignant            |    X                                                                     |          2 |
      Pancreatic, Lymphoma Malignant       |    X                                                                     |          1 |
      Renal, Lymphoma Malignant            |    X                                                                     |          2 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | M  +  +  +  M  +  M  M  M  +  M  +  M  +  M  +  +  M  +  +  +  M  +  M  +|  27        |
      Lymphoma Malignant                   |    X                                                                     |          2 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | M  +  +  M  +  +  +  +  +  M  +  +  +  M  +  M  M  M  +  M  M  +  +  +  +|  31        |
      Lymphoma Malignant                   |    X                                                                     |          2 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  46        |
      Histiocytic Sarcoma                  |                                                                          |          1 |
      Lymphoma Malignant                   |    X                                                                     |          3 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  +  +  +  M  +  +  +  +  +  +  +  +  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  40                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 3| 6| 7| 6| 8| 7| 9| 8| 8| 9| 4| 7| 8| 8| 7| 8| 8| 8| 9| 9| 8| 7| 7| 6|            |
                             DAY ON TEST   | 1| 8| 7| 9| 4| 4| 3| 1| 4| 4| 1| 4| 0| 2| 1| 3| 0| 8| 7| 1| 1| 3| 8| 2| 1|            |
                                           | 6| 6| 8| 1| 9| 7| 5| 1| 5| 7| 2| 6| 7| 6| 2| 5| 5| 0| 5| 1| 2| 8| 7| 1| 6|            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 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|     O      |
   B6C3F1 MICE MALE                        | 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|     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| 0| 0|     A      |
    0.5 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
      Lymphoma Malignant                   |    X                                                                     |          2 |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Hemangiosarcoma                      |                                                    X              X      |          3 |
      Lymphoma Malignant                   |    X                                                                     |          2 |
                                            __________________________________________________________________________|____________|
   Thymus                                  | M  +  +  +  M  M  M  M  +  M  M  +  M  +  M  +  M  M  +  +  +  +  M  M  +|  26        |
      Lymphoma Malignant                   |    X                                                                     |          2 |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M|            |
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Subcutaneous Tissue, Hemangiosarcoma |                                                    X                     |          2 |
      Subcutaneous Tissue, Sarcoma         | X                                                                        |          2 |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Alveolar/Bronchiolar Adenoma         |       X                                                  X        X  X   |          8 |
      Alveolar/Bronchiolar Carcinoma       |                   X  X     X                 X           X  X            |         10 |
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |            |
          Multiple                         | X                                         X     X  X                     |          5 |
      Carcinoma, Metastatic, Harderian     |                                                                          |            |
          Gland                            |                                        X                                 |          2 |
      Hepatocellular Carcinoma, Metastatic,|                                                                          |            |
           Liver                           |                                  X  X                                    |          4 |
      Histiocytic Sarcoma                  |                                                                          |          1 |
      Lymphoma Malignant                   |    X                                                                     |          1 |
      Mediastinum, Alveolar/Bronchiolar    |                                                                          |            |
          Carcinoma, Metastatic, Lung      |                                                                          |          1 |
      Mediastinum, Hemangioma              |                   X                                                      |          1 |
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +|  48        |
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES 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  41                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 3| 6| 7| 6| 8| 7| 9| 8| 8| 9| 4| 7| 8| 8| 7| 8| 8| 8| 9| 9| 8| 7| 7| 6|            |
                             DAY ON TEST   | 1| 8| 7| 9| 4| 4| 3| 1| 4| 4| 1| 4| 0| 2| 1| 3| 0| 8| 7| 1| 1| 3| 8| 2| 1|            |
                                           | 6| 6| 8| 1| 9| 7| 5| 1| 5| 7| 2| 6| 7| 6| 2| 5| 5| 0| 5| 1| 2| 8| 7| 1| 6|            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 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|     O      |
   B6C3F1 MICE MALE                        | 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|     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| 0| 0|     A      |
    0.5 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 SPECIAL SENSES SYSTEM - cont              |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |                                                                         +|   1        |
                                            __________________________________________________________________________|____________|
   Harderian Gland                         |                +                       +     +                 +        +|   8        |
      Adenoma                              |                X                             X                 X        X|          5 |
      Carcinoma                            |                                        X                                 |          2 |
                                            __________________________________________________________________________|____________|
   Zymbal's Gland                          |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Histiocytic Sarcoma                  |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Lymphoma Malignant                   |    X                                                                     |          1 |
 __________________________________________________________________________________________________________________________________ 
 SYSTEMIC LESIONS                          |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Histiocytic Sarcoma                  |                                                                          |          1 |
      Lymphoma Malignant                   |    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  42                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 9| 9| 6| 7| 9| 8| 6| 4| 7| 6| 8| 9| 8| 6| 7| 9| 7| 9| 8| 5| 6| 8| 5| 5| 7|             
                             DAY ON TEST   | 1| 1| 7| 4| 1| 1| 6| 6| 3| 2| 3| 1| 0| 2| 7| 1| 8| 1| 0| 8| 7| 7| 6| 7| 9|             
                                           | 1| 2| 7| 9| 2| 9| 5| 9| 2| 8| 8| 2| 7| 0| 8| 2| 6| 1| 7| 1| 0| 4| 1| 2| 1|             
 _____________________________________________________________________________________________________________________|             
                                           | 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|             
   B6C3F1 MICE MALE                        | 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|             
                               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|             
    1.0 PPM                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Gallbladder                             | +  +  A  +  +  +  +  +  A  +  +  +  +  +  +  +  A  +  +  +  +  +  +  A  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  M  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  A  +  +  +  +  +  A  +  A  +  +  +  +  +  A  +  +  +  +  +  +  +  +|             
      Carcinoma                            |                                           X                              |             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  A  +  +  +  +  +  M  A  A  +  +  +  +  +  A  +  +  +  +  +  +  A  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  A  +  +  +  +  +  A  +  A  +  +  +  +  +  A  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |                                                                         X|             
      Sarcoma, Metastatic, Uncertain       |                                                                          |             
          Primary Site                     |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  A  +  +  +  +  +  A  A  A  +  +  +  +  +  A  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |                                                                         X|             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hepatocellular Carcinoma             |       X              X                 X  X                 X        X   |             
      Hepatocellular Carcinoma, Multiple   |                   X           X                                          |             
      Hepatocellular Adenoma               |             X  X     X                                X        X        X|             
      Hepatocellular Adenoma, Multiple     |                                              X                           |             
      Hepatocholangiocarcinoma             |                               X                                          |             
      Sarcoma, Metastatic, Uncertain       |                                                                          |             
          Primary Site                     |                                                                          |             
                                            __________________________________________________________________________|             
   Mesentery                               | +                                +                       +        +      |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Lymphoma Malignant                   |                                                                          |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Squamous Cell Papilloma              |                                                                          |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Tooth                                   |                                                                          |             
      Odontoma                             |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            |                                                                          |             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |                                              X                           |             
      Hepatocellular Carcinoma, Metastatic,|                                                                          |             
           Liver                           |                               X                                          |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  M  +  +  +  +  +  +  M  +  M  +  M  M  +  M  M  +  +  +  +  M  +  I  M|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  I  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  43                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 9| 9| 6| 7| 9| 8| 6| 4| 7| 6| 8| 9| 8| 6| 7| 9| 7| 9| 8| 5| 6| 8| 5| 5| 7|             
                             DAY ON TEST   | 1| 1| 7| 4| 1| 1| 6| 6| 3| 2| 3| 1| 0| 2| 7| 1| 8| 1| 0| 8| 7| 7| 6| 7| 9|             
                                           | 1| 2| 7| 9| 2| 9| 5| 9| 2| 8| 8| 2| 7| 0| 8| 2| 6| 1| 7| 1| 0| 4| 1| 2| 1|             
 _____________________________________________________________________________________________________________________|             
                                           | 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|             
   B6C3F1 MICE MALE                        | 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|             
                               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|             
    1.0 PPM                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Histiocytic Sarcoma                  |                                                                          |             
                                            __________________________________________________________________________|             
   Penis                                   |    +     +        +                                   +  +     +         |             
                                            __________________________________________________________________________|             
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +|             
      Adenoma                              |                                                                          |             
                                            __________________________________________________________________________|             
   Prostate                                | +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Interstitial Cell, Adenoma           |             X                                                            |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemangiosarcoma                      |                                                 X                        |             
      Femoral, Mast Cell Tumor NOS         |                                                                X         |             
                                            __________________________________________________________________________|             
   Lymph Node                              |                         +                                   +           +|             
      Iliac, Lymphoma Malignant            |                                                                          |             
      Renal, Lymphoma Malignant            |                                                                         X|             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | M  M  M  M  +  +  M  +  +  M  +  +  +  +  M  +  M  +  M  +  M  M  +  M  M|             
      Lymphoma Malignant                   |                                                                          |             
      Sarcoma, Metastatic, Uncertain       |                                                                          |             
          Primary Site                     |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | M  +  +  M  +  +  M  +  M  +  M  +  +  M  +  +  +  +  M  +  +  +  +  +  M|             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  M  I  +  +|             
      Lymphoma Malignant                   |                                                                         X|             
      Sarcoma, Metastatic, Uncertain       |                                                                          |             
          Primary Site                     |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  M  +  +  +  +  +  +  +  M  +|             
      Carcinoma, Metastatic, Harderian     |                                                                          |             
          Gland                            |                X                                                         |             
      Lymphoma Malignant                   |                                                                         X|             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemangiosarcoma                      |                                                 X                        |             
      Lymphoma Malignant                   |                                                                         X|             
      Mast Cell Tumor NOS                  |                                                                X         |             
                                            __________________________________________________________________________|             
   Thymus                                  | M  M  M  +  +  M  M  +  M  +  M  +  M  +  M  M  M  +  M  M  M  +  M  I  +|             
      Lymphoma Malignant                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  44                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 9| 9| 6| 7| 9| 8| 6| 4| 7| 6| 8| 9| 8| 6| 7| 9| 7| 9| 8| 5| 6| 8| 5| 5| 7|             
                             DAY ON TEST   | 1| 1| 7| 4| 1| 1| 6| 6| 3| 2| 3| 1| 0| 2| 7| 1| 8| 1| 0| 8| 7| 7| 6| 7| 9|             
                                           | 1| 2| 7| 9| 2| 9| 5| 9| 2| 8| 8| 2| 7| 0| 8| 2| 6| 1| 7| 1| 0| 4| 1| 2| 1|             
 _____________________________________________________________________________________________________________________|             
                                           | 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|             
   B6C3F1 MICE MALE                        | 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|             
                               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|             
    1.0 PPM                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM - cont               |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  I|             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemangiosarcoma                      |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Osteosarcoma                         |                                                                          |             
                                            __________________________________________________________________________|             
   Skeletal Muscle                         |                                                                          |             
      Sarcoma, Metastatic, Uncertain       |                                                                          |             
          Primary Site                     |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Alveolar/Bronchiolar Adenoma         |                                        X        X                        |             
      Alveolar/Bronchiolar Adenoma,        |                                                                          |             
          Multiple                         | X                                                                        |             
      Alveolar/Bronchiolar Carcinoma       | X        X                 X                    X     X                  |             
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |             
          Multiple                         |                   X                                            X         |             
      Carcinoma, Metastatic, Harderian     |                                                                          |             
          Gland                            |                X                                                         |             
      Hepatocellular Carcinoma, Metastatic,|                                                                          |             
           Liver                           |       X                                                                  |             
      Hepatocholangiocarcinoma, Metastatic,|                                                                          |             
           Liver                           |                               X                                          |             
      Lymphoma Malignant                   |                                                                         X|             
      Osteosarcoma, Metastatic, Bone       |                                                                          |             
      Sarcoma, Metastatic, Uncertain       |                                                                          |             
          Primary Site                     |                                                                          |             
      Mediastinum,                         |                                                                          |             
          Hepatocholangiocarcinoma,        |                                                                          |             
          Metastatic, Liver                |                                                                          |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                                                                          |             
                                            __________________________________________________________________________|             
   Harderian Gland                         |                +                                               +         |             
      Adenoma                              |                                                                X         |             
      Carcinoma                            |                X                                                         |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  45                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 9| 9| 6| 7| 9| 8| 6| 4| 7| 6| 8| 9| 8| 6| 7| 9| 7| 9| 8| 5| 6| 8| 5| 5| 7|             
                             DAY ON TEST   | 1| 1| 7| 4| 1| 1| 6| 6| 3| 2| 3| 1| 0| 2| 7| 1| 8| 1| 0| 8| 7| 7| 6| 7| 9|             
                                           | 1| 2| 7| 9| 2| 9| 5| 9| 2| 8| 8| 2| 7| 0| 8| 2| 6| 1| 7| 1| 0| 4| 1| 2| 1|             
 _____________________________________________________________________________________________________________________|             
                                           | 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|             
   B6C3F1 MICE MALE                        | 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|             
                               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|             
    1.0 PPM                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM - cont              |                                                                          |             
                                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SYSTEMIC LESIONS                          |                                                                          |             
                                            __________________________________________________________________________|             
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Histiocytic Sarcoma                  |                                                                          |             
      Lymphoma Malignant                   |                                                                         X|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  46                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 8| 2| 6| 6| 9| 9| 5| 8| 6| 8| 4| 9| 7| 6| 9| 8| 9| 7| 8| 6| 6| 8| 4| 9| 7|            |
                             DAY ON TEST   | 3| 9| 1| 2| 1| 1| 5| 0| 8| 1| 3| 1| 4| 7| 1| 7| 1| 3| 2| 0| 7| 7| 0| 1| 1|            |
                                           | 2| 7| 6| 3| 2| 2| 0| 8| 5| 2| 5| 1| 1| 7| 2| 7| 1| 0| 8| 9| 8| 5| 8| 2| 9|            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 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|     O      |
   B6C3F1 MICE MALE                        | 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|     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| 2| 2|     A      |
    1.0 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Gallbladder                             | A  +  +  +  +  +  A  +  +  +  +  +  +  A  +  +  +  +  +  +  A  +  A  +  A|  40        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | A  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  A  +  A|  43        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  A  +  A|  44        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | A  +  +  +  +  +  A  A  +  +  +  +  +  +  +  +  +  +  +  +  A  +  A  +  A|  40        |
      Carcinoma                            |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  A  A  +  +  A  +  +  +  +  +  +  +  +  +  A  +  A  +  A|  38        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  A  +  +  +  A  +  +  +  +  +  +  +  +  +  A  +  A  +  A|  41        |
      Lymphoma Malignant                   |                                                                          |          1 |
      Sarcoma, Metastatic, Uncertain       |                                                                          |            |
          Primary Site                     |       X                                                                  |          1 |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | A  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  A  +  A|  40        |
      Lymphoma Malignant                   |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hepatocellular Carcinoma             | X  X  X     X     X           X              X                          X|         14 |
      Hepatocellular Carcinoma, Multiple   |                         X                             X  X  X        X   |          7 |
      Hepatocellular Adenoma               |                X                 X                 X  X        X         |         11 |
      Hepatocellular Adenoma, Multiple     |                                                                          |          1 |
      Hepatocholangiocarcinoma             |                                                    X                     |          2 |
      Sarcoma, Metastatic, Uncertain       |                                                                          |            |
          Primary Site                     |       X                                                                  |          1 |
                                            __________________________________________________________________________|____________|
   Mesentery                               |                                                                          |   4        |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +|  49        |
      Lymphoma Malignant                   |                      X                                                   |          1 |
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Squamous Cell Papilloma              |                                                                X         |          1 |
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  48        |
                                            __________________________________________________________________________|____________|
   Tooth                                   |                                                                      +   |   1        |
      Odontoma                             |                                                                      X   |          1 |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            |       +                                                                  |   1        |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +|  49        |
      Adenoma                              |                                                                          |          1 |
      Hepatocellular Carcinoma, Metastatic,|                                                                          |            |
 __________________________________________________________________________________________________________________________________ 

                         * : 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: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 8| 2| 6| 6| 9| 9| 5| 8| 6| 8| 4| 9| 7| 6| 9| 8| 9| 7| 8| 6| 6| 8| 4| 9| 7|            |
                             DAY ON TEST   | 3| 9| 1| 2| 1| 1| 5| 0| 8| 1| 3| 1| 4| 7| 1| 7| 1| 3| 2| 0| 7| 7| 0| 1| 1|            |
                                           | 2| 7| 6| 3| 2| 2| 0| 8| 5| 2| 5| 1| 1| 7| 2| 7| 1| 0| 8| 9| 8| 5| 8| 2| 9|            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 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|     O      |
   B6C3F1 MICE MALE                        | 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|     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| 2| 2|     A      |
    1.0 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
                                           |                                                                          |            |
           Liver                           |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  M  M  +  M  M  M  +  +  M  M  M  M  M  M  +  +  M  +  M  M  M|  25        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +|  48        |
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Histiocytic Sarcoma                  |                X                                                         |          1 |
                                            __________________________________________________________________________|____________|
   Penis                                   |                                     +                                    |   7        |
                                            __________________________________________________________________________|____________|
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Adenoma                              |                            X                                             |          1 |
                                            __________________________________________________________________________|____________|
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  A|  47        |
                                            __________________________________________________________________________|____________|
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A|  49        |
                                            __________________________________________________________________________|____________|
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Interstitial Cell, Adenoma           |                      X                                                   |          2 |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemangiosarcoma                      |                                        X                                 |          2 |
      Femoral, Mast Cell Tumor NOS         |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |          +     +     +                                +                  |   7        |
      Iliac, Lymphoma Malignant            |                      X                                                   |          1 |
      Renal, Lymphoma Malignant            |          X           X                                                   |          3 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | +  +  +  +  +  +  +  +  M  +  +  +  +  +  M  M  +  +  +  +  +  M  +  +  M|  32        |
      Lymphoma Malignant                   |                      X                                                   |          1 |
      Sarcoma, Metastatic, Uncertain       |                                                                          |            |
          Primary Site                     |       X                                                                  |          1 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  M  +  +  +  +  M  M  +  +  I  M  M  +  M  M  M  +  +  +  +  M  +|  32        |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  M  +  A  +  +|  44        |
      Lymphoma Malignant                   |                      X                                                   |          2 |
      Sarcoma, Metastatic, Uncertain       |                                                                          |            |
          Primary Site                     |       X                                                                  |          1 |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  M  +  +  +  +  +  +  M  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  M|  43        |
      Carcinoma, Metastatic, Harderian     |                                                                          |            |
 __________________________________________________________________________________________________________________________________ 

                         * : 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: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 8| 2| 6| 6| 9| 9| 5| 8| 6| 8| 4| 9| 7| 6| 9| 8| 9| 7| 8| 6| 6| 8| 4| 9| 7|            |
                             DAY ON TEST   | 3| 9| 1| 2| 1| 1| 5| 0| 8| 1| 3| 1| 4| 7| 1| 7| 1| 3| 2| 0| 7| 7| 0| 1| 1|            |
                                           | 2| 7| 6| 3| 2| 2| 0| 8| 5| 2| 5| 1| 1| 7| 2| 7| 1| 0| 8| 9| 8| 5| 8| 2| 9|            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 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|     O      |
   B6C3F1 MICE MALE                        | 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|     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| 2| 2|     A      |
    1.0 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
          Gland                            |                                                                          |          1 |
      Lymphoma Malignant                   |                      X                                                   |          2 |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemangiosarcoma                      |                            X           X                             X   |          4 |
      Lymphoma Malignant                   |          X                                                               |          2 |
      Mast Cell Tumor NOS                  |                                                                          |          1 |
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  M  +  +  M  +  +  I  +  +  +  +  M  M  +  M  +  M  M  +  I  +  +|  25        |
      Lymphoma Malignant                   |                      X                                                   |          1 |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | M  M  +  M  M  M  M  M  +  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M|   2        |
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemangiosarcoma                      |                                                       X                  |          1 |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Osteosarcoma                         |                                     X                                    |          1 |
                                            __________________________________________________________________________|____________|
   Skeletal Muscle                         |       +                                                                  |   1        |
      Sarcoma, Metastatic, Uncertain       |                                                                          |            |
          Primary Site                     |       X                                                                  |          1 |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Alveolar/Bronchiolar Adenoma         |          X     X                          X     X              X     X   |          8 |
      Alveolar/Bronchiolar Adenoma,        |                                                                          |            |
          Multiple                         |                                                                          |          1 |
      Alveolar/Bronchiolar Carcinoma       |             X  X                 X     X  X     X     X  X     X         |         14 |
      Alveolar/Bronchiolar Carcinoma,      |                                                                          |            |
          Multiple                         | X                          X                                             |          4 |
      Carcinoma, Metastatic, Harderian     |                                                                          |            |
          Gland                            |                                                                          |          1 |
      Hepatocellular Carcinoma, Metastatic,|                                                                          |            |
           Liver                           | X                       X                    X           X  X        X   |          7 |
      Hepatocholangiocarcinoma, Metastatic,|                                                                          |            |
           Liver                           |                                                    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  49                                                               
NTP Experiment-Test: 88034-06                        NEOPLASMS BY INDIVIDUAL ANIMAL                               Report: PEIRPT04
Study Type: CHRONIC 30-MONTH                                      OZONE                                           Date: 03/27/96  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 14:41:57  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 8| 2| 6| 6| 9| 9| 5| 8| 6| 8| 4| 9| 7| 6| 9| 8| 9| 7| 8| 6| 6| 8| 4| 9| 7|            |
                             DAY ON TEST   | 3| 9| 1| 2| 1| 1| 5| 0| 8| 1| 3| 1| 4| 7| 1| 7| 1| 3| 2| 0| 7| 7| 0| 1| 1|            |
                                           | 2| 7| 6| 3| 2| 2| 0| 8| 5| 2| 5| 1| 1| 7| 2| 7| 1| 0| 8| 9| 8| 5| 8| 2| 9|            |
 _____________________________________________________________________________________________________________________|     T (*)  |
                                           | 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|     O      |
   B6C3F1 MICE MALE                        | 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|     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| 2| 2|     A      |
    1.0 PPM                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|     L      |
                                           | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 RESPIRATORY SYSTEM - cont                 |                                                                          |            |
                                           |                                                                          |            |
      Lymphoma Malignant                   |                                                                          |          1 |
      Osteosarcoma, Metastatic, Bone       |                                     X                                    |          1 |
      Sarcoma, Metastatic, Uncertain       |                                                                          |            |
          Primary Site                     |       X                                                                  |          1 |
      Mediastinum,                         |                                                                          |            |
          Hepatocholangiocarcinoma,        |                                                                          |            |
          Metastatic, Liver                |                                                    X                     |          1 |
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +|  49        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |                                                       +                  |   1        |
                                            __________________________________________________________________________|____________|
   Harderian Gland                         |             +                                +        +                  |   5        |
      Adenoma                              |             X                                X        X                  |          4 |
      Carcinoma                            |                                                                          |          1 |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|  48        |
 __________________________________________________________________________________________________________________________________ 
 SYSTEMIC LESIONS                          |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Multiple Organs                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Histiocytic Sarcoma                  |                X                                                         |          1 |
      Lymphoma Malignant                   |          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  50                                                               
                                  ------------------------------------------------------------                                      
                                  ----------              END OF REPORT             ----------                                      
                                  ------------------------------------------------------------