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TDMS Study 05181-04 Pathology Tables

NTP                                        STATISTICAL ANALYSIS OF PRIMARY TUMORS                              REPORT: PEIRPT08     
LAB: Battelle Northwest                                     TETRAHYDROFURAN                                    DATE: 02/21/96       
EXPERIMENT: 05181 TEST: 04                                                                                     TIME: 12:48:55       
TEST TYPE:  CHRONIC                             CAGES FROM 0000 TO LAST CAGE                                   PAGE:       1        
CONT: N01-ES-95259                              ROUTE: RESPIRATORY EXPOSURE WHOLE BODY                         NTP C#: 60560C       
PATHOLOGIST: R. MILLER                                                                                         CAS: 0109-99-9       
------------------------------------------------------------------------------------------------------------------------------------
                                                             CORE STUDY                                                             
               REASONS FOR REMOVAL:    ALL                                                                                          
               REMOVAL DATE RANGE:     ALL                                                                                          
               TREATMENT GROUPS:       INCLUDE ALL                                                                                  
NTP                                        STATISTICAL ANALYSIS OF PRIMARY TUMORS                              REPORT: PEIRPT08     
LAB: Battelle Northwest                                     TETRAHYDROFURAN                                    DATE: 02/21/96       
EXPERIMENT: 05181 TEST: 04                                                                                     TIME: 12:48:55       
TEST TYPE:  CHRONIC                             CAGES FROM 0000 TO LAST CAGE                                                        
CONT: N01-ES-95259                              ROUTE: RESPIRATORY EXPOSURE WHOLE BODY                         NTP C#: 60560C       
PATHOLOGIST: R. MILLER                                                                                         CAS: 0109-99-9       
                                                    MICE(B6C3F1)
                                              ----------------------------
             FOR ALL DOSES THE TUMOR RATES IN THE FOLLOWING TISSUES/ORGANS ARE BASED ON NUMBER OF TISSUES EXAMINED.
             IN OTHER TISSUES/ORGANS, RATES ARE BASED ON NUMBER OF ANIMALS NECROPSIED.
                                                    ----------------
                                                    Adrenal Cortex
                                                    Adrenal Medulla
                                                    Bone Marrow
                                                    Brain
                                                    Clitoral Gland
                                                    Epididymis
                                                    Gallbladder
                                                    Heart
                                                    Islets, Pancreatic
                                                    Kidney
                                                    Larynx
                                                    Liver
                                                    Lung
                                                    Nose
                                                    Ovary
                                                    Pancreas
                                                    Parathyroid Gland
                                                    Pituitary Gland
                                                    Preputial Gland
                                                    Prostate
                                                    Salivary Glands
                                                    Spleen
                                                    Testes
                                                    Thymus
                                                    Thyroid Gland
                                                    Urinary Bladder
NTP                                        STATISTICAL ANALYSIS OF PRIMARY TUMORS                              REPORT: PEIRPT08     
LAB: Battelle Northwest                                     TETRAHYDROFURAN                                    DATE: 02/21/96       
EXPERIMENT: 05181 TEST: 04                                                                                     TIME: 12:48:55       
TEST TYPE:  CHRONIC                             CAGES FROM 0000 TO LAST CAGE                                                        
CONT: N01-ES-95259                              ROUTE: RESPIRATORY EXPOSURE WHOLE BODY                         NTP C#: 60560C       
PATHOLOGIST: R. MILLER                                                                                         CAS: 0109-99-9       
                                     SUMMARY OF STATISTICALLY SIGNIFICANT (P<=.05) RESULTS
                                        IN THE ANALYSIS OF THE STUDY OF TETRAHYDROFURAN
              ====================================================================================================
                                                           MALE MICE
                                                          -------------
                  ORGAN                               MORPHOLOGY
                 -------                             ------------
              Liver                         Hepatocellular Adenoma
                                            Hepatocellular Carcinoma or Hepatocellular Adenoma
                                            Hepatocellular Carcinoma, Hepatocellular Adenoma, or Hepatoblastoma
              Lung                          Alveolar/Bronchiolar Adenoma
                                            Alveolar/Bronchiolar Carcinoma or Alveolar/Bronchiolar Adenoma
              All Organs                    Benign Tumors
                                            Malignant Tumors
                                            Malignant and Benign Tumors
              ====================================================================================================
                                                           FEMALE MICE
                                                          -------------
                  ORGAN                               MORPHOLOGY
                 -------                             ------------
              Liver                         Hepatocellular Adenoma
                                            Hepatocellular Carcinoma
                                            Hepatocellular Carcinoma or Hepatocellular Adenoma
                                            Hepatocellular Carcinoma, Hepatocellular Adenoma, or Hepatoblastoma
              Skin                          Sarcoma
              Thyroid Gland: C-Cell         Carcinoma
              All Organs                    Benign Tumors
                                            Malignant Tumors
                                            Malignant and Benign Tumors
              ====================================================================================================
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE   1
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Adrenal Cortex                                                                                                                   |
|     Adenoma                                                                                                                     |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  3/48 (6%)    1/50 (2%)    0/49 (0%)    0/50 (0%)  |  0/50 (0%)    0/50 (0%)    0/50 (0%)    0/46 (0%)  |
|ADJUSTED (b)           |   9.4%         3.2%         0.0%         0.0%      |   0.0%         0.0%         0.0%         0.0%      |
|TERMINAL (d)           |  3/32 (9%)    1/31 (3%)    0/28 (0%)    0/12 (0%)  |  0/29 (0%)    0/33 (0%)    0/26 (0%)    0/32 (0%)  |
|FIRST INCIDENCE (DAYS) |   733 (T)      733 (T)      ---          ---       |   ---          ---          ---          ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.194N     P=0.316N     P=0.145N     P=0.336N   |    (e)          (e)          (e)          (e)      |
|INCIDENTAL TUMOR       |  P=0.194N     P=0.316N     P=0.145N     P=0.336N   |    (e)          (e)          (e)          (e)      |
|LOGISTIC REGRESSION    |  P=0.194N     P=0.316N     P=0.145N     P=0.336N   |    (e)          (e)          (e)          (e)      |
|COCHRAN-ARMITAGE       |  P=0.094N                                          |    (e)                                             |
|FISHER EXACT           |               P=0.293N     P=0.117N     P=0.114N   |                 (e)          (e)          (e)      |
|=================================================================================================================================|
|                                                                                                                                 |
|Adrenal Medulla                                                                                                                  |
|     Pheochromocytoma Benign                                                                                                     |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  1/48 (2%)    0/50 (0%)    1/49 (2%)    0/50 (0%)  |  0/49 (0%)    1/49 (2%)    0/50 (0%)    2/45 (4%)  |
|ADJUSTED (b)           |   3.1%         0.0%         3.4%         0.0%      |   0.0%         3.0%         0.0%         5.6%      |
|TERMINAL (d)           |  1/32 (3%)    0/31 (0%)    0/28 (0%)    0/12 (0%)  |  0/29 (0%)    1/33 (3%)    0/26 (0%)    1/31 (3%)  |
|FIRST INCIDENCE (DAYS) |   733 (T)      ---          721          ---       |   ---          733 (T)      ---          599       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.661N     P=0.506N     P=0.731      P=0.695N   |  P=0.155      P=0.526        (e)        P=0.253    |
|INCIDENTAL TUMOR       |  P=0.573N     P=0.506N     P=0.669      P=0.695N   |  P=0.202      P=0.526        (e)        P=0.345    |
|LOGISTIC REGRESSION    |  P=0.644N     P=0.506N     P=0.725      P=0.695N   |  P=0.141      P=0.526        (e)        P=0.223    |
|COCHRAN-ARMITAGE       |  P=0.454N                                          |  P=0.130                                           |
|FISHER EXACT           |               P=0.490N     P=0.747N     P=0.490N   |               P=0.500        (e)        P=0.226    |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE   2
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Adrenal Medulla                                                                                                                  |
|     Pheochromocytoma: Benign, Complex, Malignant, NOS                                                                           |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  1/48 (2%)    0/50 (0%)    1/49 (2%)    0/50 (0%)  |  0/49 (0%)    1/49 (2%)    1/50 (2%)    2/45 (4%)  |
|ADJUSTED (b)           |   3.1%         0.0%         3.4%         0.0%      |   0.0%         3.0%         3.8%         5.6%      |
|TERMINAL (d)           |  1/32 (3%)    0/31 (0%)    0/28 (0%)    0/12 (0%)  |  0/29 (0%)    1/33 (3%)    1/26 (4%)    1/31 (3%)  |
|FIRST INCIDENCE (DAYS) |   733 (T)      ---          721          ---       |   ---          733 (T)      733 (T)      599       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.661N     P=0.506N     P=0.731      P=0.695N   |  P=0.200      P=0.526      P=0.478      P=0.253    |
|INCIDENTAL TUMOR       |  P=0.573N     P=0.506N     P=0.669      P=0.695N   |  P=0.246      P=0.526      P=0.478      P=0.345    |
|LOGISTIC REGRESSION    |  P=0.644N     P=0.506N     P=0.725      P=0.695N   |  P=0.188      P=0.526      P=0.478      P=0.223    |
|COCHRAN-ARMITAGE       |  P=0.454N                                          |  P=0.169                                           |
|FISHER EXACT           |               P=0.490N     P=0.747N     P=0.490N   |               P=0.500      P=0.505      P=0.226    |
|=================================================================================================================================|
|                                                                                                                                 |
|Bone                                                                                                                             |
|     Osteosarcoma                                                                                                                |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  0/50 (0%)    0/50 (0%)    0/50 (0%)    0/50 (0%)  |  1/50 (2%)    1/50 (2%)    0/50 (0%)    2/50 (4%)  |
|ADJUSTED (b)           |   0.0%         0.0%         0.0%         0.0%      |   3.4%         3.0%         0.0%         5.5%      |
|TERMINAL (d)           |  0/32 (0%)    0/31 (0%)    0/28 (0%)    0/12 (0%)  |  1/29 (3%)    1/33 (3%)    0/26 (0%)    1/32 (3%)  |
|FIRST INCIDENCE (DAYS) |   ---          ---          ---          ---       |   733 (T)      733 (T)      ---          598       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |    (e)          (e)          (e)          (e)      |  P=0.350      P=0.733N     P=0.522N     P=0.532    |
|INCIDENTAL TUMOR       |    (e)          (e)          (e)          (e)      |  P=0.408      P=0.733N     P=0.522N     P=0.620    |
|LOGISTIC REGRESSION    |    (e)          (e)          (e)          (e)      |  P=0.347      P=0.733N     P=0.522N     P=0.527    |
|COCHRAN-ARMITAGE       |    (e)                                             |  P=0.332                                           |
|FISHER EXACT           |                 (e)          (e)          (e)      |               P=0.753N     P=0.500N     P=0.500    |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE   3
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Harderian Gland                                                                                                                  |
|     Adenoma                                                                                                                     |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  1/50 (2%)    3/50 (6%)    3/50 (6%)    1/50 (2%)  |  2/50 (4%)    1/50 (2%)    2/50 (4%)    1/50 (2%)  |
|ADJUSTED (b)           |   2.5%         9.7%        10.3%         5.6%      |   6.1%         3.0%         7.7%         3.1%      |
|TERMINAL (d)           |  0/32 (0%)    3/31 (10%)   2/28 (7%)    0/12 (0%)  |  1/29 (3%)    1/33 (3%)    2/26 (8%)    1/32 (3%)  |
|FIRST INCIDENCE (DAYS) |   658          733 (T)      721          658       |   604          733 (T)      733 (T)      733 (T)   |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.485      P=0.289      P=0.255      P=0.574    |  P=0.459N     P=0.458N     P=0.669      P=0.471N   |
|INCIDENTAL TUMOR       |  P=0.585      P=0.273      P=0.171      P=0.702    |  P=0.410N     P=0.431N     P=0.683N     P=0.380N   |
|LOGISTIC REGRESSION    |  P=0.533      P=0.284      P=0.262      P=0.664    |  P=0.460N     P=0.473N     P=0.672N     P=0.473N   |
|COCHRAN-ARMITAGE       |  P=0.418N                                          |  P=0.476N                                          |
|FISHER EXACT           |               P=0.309      P=0.309      P=0.753N   |               P=0.500N     P=0.691N     P=0.500N   |
|=================================================================================================================================|
|                                                                                                                                 |
|Harderian Gland                                                                                                                  |
|     Carcinoma                                                                                                                   |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  3/50 (6%)    0/50 (0%)    0/50 (0%)    1/50 (2%)  |  0/50 (0%)    1/50 (2%)    0/50 (0%)    0/50 (0%)  |
|ADJUSTED (b)           |   8.3%         0.0%         0.0%         8.3%      |   0.0%         3.0%         0.0%         0.0%      |
|TERMINAL (d)           |  2/32 (6%)    0/31 (0%)    0/28 (0%)    1/12 (8%)  |  0/29 (0%)    1/33 (3%)    0/26 (0%)    0/32 (0%)  |
|FIRST INCIDENCE (DAYS) |   582          ---          ---          733 (T)   |   ---          733 (T)      ---          ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.694      P=0.135N     P=0.148N     P=0.669N   |  P=0.575N     P=0.526        (e)          (e)      |
|INCIDENTAL TUMOR       |  P=0.708      P=0.127N     P=0.088N     P=0.690N   |  P=0.575N     P=0.526        (e)          (e)      |
|LOGISTIC REGRESSION    |  P=0.646N     P=0.121N     P=0.121N     P=0.579N   |  P=0.575N     P=0.526        (e)          (e)      |
|COCHRAN-ARMITAGE       |  P=0.442N                                          |  P=0.585N                                          |
|FISHER EXACT           |               P=0.121N     P=0.121N     P=0.309N   |               P=0.500        (e)          (e)      |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE   4
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Harderian Gland                                                                                                                  |
|     Carcinoma or Adenoma                                                                                                        |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  4/50 (8%)    3/50 (6%)    3/50 (6%)    2/50 (4%)  |  2/50 (4%)    2/50 (4%)    2/50 (4%)    1/50 (2%)  |
|ADJUSTED (b)           |  10.6%         9.7%        10.3%        13.4%      |   6.1%         6.1%         7.7%         3.1%      |
|TERMINAL (d)           |  2/32 (6%)    3/31 (10%)   2/28 (7%)    1/12 (8%)  |  1/29 (3%)    2/33 (6%)    2/26 (8%)    1/32 (3%)  |
|FIRST INCIDENCE (DAYS) |   582          733 (T)      721          658       |   604          733 (T)      733 (T)      733 (T)   |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.479      P=0.531N     P=0.578N     P=0.585    |  P=0.364N     P=0.649N     P=0.669      P=0.471N   |
|INCIDENTAL TUMOR       |  P=0.568      P=0.534N     P=0.585N     P=0.651    |  P=0.323N     P=0.628N     P=0.683N     P=0.380N   |
|LOGISTIC REGRESSION    |  P=0.559      P=0.521N     P=0.540N     P=0.653N   |  P=0.365N     P=0.664N     P=0.672N     P=0.473N   |
|COCHRAN-ARMITAGE       |  P=0.304N                                          |  P=0.381N                                          |
|FISHER EXACT           |               P=0.500N     P=0.500N     P=0.339N   |               P=0.691N     P=0.691N     P=0.500N   |
|=================================================================================================================================|
|                                                                                                                                 |
|Liver                                                                                                                            |
|     Hemangiosarcoma                                                                                                             |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  1/50 (2%)    1/50 (2%)    2/50 (4%)    0/50 (0%)  |  0/50 (0%)    1/50 (2%)    0/50 (0%)    0/48 (0%)  |
|ADJUSTED (b)           |   3.1%         3.0%         7.1%         0.0%      |   0.0%         3.0%         0.0%         0.0%      |
|TERMINAL (d)           |  1/32 (3%)    0/31 (0%)    2/28 (7%)    0/12 (0%)  |  0/29 (0%)    1/33 (3%)    0/26 (0%)    0/32 (0%)  |
|FIRST INCIDENCE (DAYS) |   733 (T)      706          733 (T)      ---       |   ---          733 (T)      ---          ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.587N     P=0.753      P=0.453      P=0.695N   |  P=0.575N     P=0.526        (e)          (e)      |
|INCIDENTAL TUMOR       |  P=0.534N     P=0.725      P=0.453      P=0.695N   |  P=0.575N     P=0.526        (e)          (e)      |
|LOGISTIC REGRESSION    |  P=0.566N     P=0.749      P=0.453      P=0.695N   |  P=0.575N     P=0.526        (e)          (e)      |
|COCHRAN-ARMITAGE       |  P=0.332N                                          |  P=0.593N                                          |
|FISHER EXACT           |               P=0.753N     P=0.500      P=0.500N   |               P=0.500        (e)          (e)      |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE   5
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Liver                                                                                                                            |
|     Hepatocellular Adenoma                                                                                                      |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 24/50 (48%)  19/50 (38%)  16/50 (32%)  14/50 (28%) | 12/50 (24%)  17/50 (34%)  18/50 (36%)  31/48 (65%) |
|ADJUSTED (b)           |  60.5%        53.4%        48.7%        59.0%      |  35.9%        47.1%        52.5%        76.8%      |
|TERMINAL (d)           | 17/32 (53%)  15/31 (48%)  12/28 (43%)   4/12 (33%) |  8/29 (28%)  14/33 (42%)  11/26 (42%)  23/32 (72%) |
|FIRST INCIDENCE (DAYS) |   362          324          440          245       |   648          640          469          399       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.097      P=0.273N     P=0.199N     P=0.181    |  P<0.001 **   P=0.313      P=0.119      P=0.001 ** |
|INCIDENTAL TUMOR       |  P=0.389N     P=0.224N     P=0.203N     P=0.395N   |  P<0.001 **   P=0.196      P=0.197      P<0.001 ** |
|LOGISTIC REGRESSION    |  P=0.506N     P=0.211N     P=0.142N     P=0.414N   |  P<0.001 **   P=0.249      P=0.188      P<0.001 ** |
|COCHRAN-ARMITAGE       |  P=0.041N*                                         |  P<0.001 **                                        |
|FISHER EXACT           |               P=0.210N     P=0.076N     P=0.032N*  |               P=0.189      P=0.138      P<0.001 ** |
|=================================================================================================================================|
|                                                                                                                                 |
|Liver                                                                                                                            |
|     Hepatocellular Carcinoma                                                                                                    |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 14/50 (28%)  13/50 (26%)  14/50 (28%)   9/50 (18%) |  6/50 (12%)  10/50 (20%)  10/50 (20%)  16/48 (33%) |
|ADJUSTED (b)           |  33.3%        28.9%        31.4%        50.0%      |  16.5%        26.3%        30.0%        40.8%      |
|TERMINAL (d)           |  6/32 (19%)   3/31 (10%)   2/28 (7%)    4/12 (33%) |  2/29 (7%)    6/33 (18%)   5/26 (19%)  10/32 (31%) |
|FIRST INCIDENCE (DAYS) |   481          441          376          359       |   478          552          544          562       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.161      P=0.557N     P=0.455      P=0.190    |  P=0.027 *    P=0.297      P=0.210      P=0.035 *  |
|INCIDENTAL TUMOR       |  P=0.555N     P=0.425N     P=0.352N     P=0.518    |  P=0.028 *    P=0.242      P=0.319      P=0.042 *  |
|LOGISTIC REGRESSION    |  P=0.459      P=0.412N     P=0.270N     P=0.363    |  P=0.012 *    P=0.234      P=0.229      P=0.014 *  |
|COCHRAN-ARMITAGE       |  P=0.136N                                          |  P=0.009 **                                        |
|FISHER EXACT           |               P=0.500N     P=0.588N     P=0.171N   |               P=0.207      P=0.207      P=0.011 *  |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE   6
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Liver                                                                                                                            |
|     Hepatocellular Carcinoma or Hepatocellular Adenoma                                                                          |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 35/50 (70%)  31/50 (62%)  30/50 (60%)  18/50 (36%) | 17/50 (34%)  24/50 (48%)  26/50 (52%)  41/48 (85%) |
|ADJUSTED (b)           |  77.2%        67.9%        66.9%        73.4%      |  46.3%        61.3%        69.1%        93.0%      |
|TERMINAL (d)           | 22/32 (69%)  17/31 (55%)  14/28 (50%)   6/12 (50%) | 10/29 (34%)  18/33 (55%)  15/26 (58%)  29/32 (91%) |
|FIRST INCIDENCE (DAYS) |   362          324          376          245       |   478          552          469          399       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.181      P=0.407N     P=0.501N     P=0.237    |  P<0.001 **   P=0.253      P=0.056      P<0.001 ** |
|INCIDENTAL TUMOR       |  P=0.098N     P=0.213N     P=0.185N     P=0.171N   |  P<0.001 **   P=0.149      P=0.118      P<0.001 ** |
|LOGISTIC REGRESSION    |  P=0.105N     P=0.210N     P=0.121N     P=0.175N   |  P<0.001 **   P=0.188      P=0.086      P<0.001 ** |
|COCHRAN-ARMITAGE       |  P<0.001N**                                        |  P<0.001 **                                        |
|FISHER EXACT           |               P=0.263N     P=0.201N     P<0.001N** |               P=0.111      P=0.053      P<0.001 ** |
|=================================================================================================================================|
|                                                                                                                                 |
|Liver                                                                                                                            |
|     Hepatocellular Carcinoma, Hepatocellular Adenoma, or Hepatoblastoma                                                         |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 35/50 (70%)  31/50 (62%)  30/50 (60%)  18/50 (36%) | 17/50 (34%)  24/50 (48%)  26/50 (52%)  41/48 (85%) |
|ADJUSTED (b)           |  77.2%        67.9%        66.9%        73.4%      |  46.3%        61.3%        69.1%        93.0%      |
|TERMINAL (d)           | 22/32 (69%)  17/31 (55%)  14/28 (50%)   6/12 (50%) | 10/29 (34%)  18/33 (55%)  15/26 (58%)  29/32 (91%) |
|FIRST INCIDENCE (DAYS) |   362          324          376          245       |   478          552          469          399       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.181      P=0.407N     P=0.501N     P=0.237    |  P<0.001 **   P=0.253      P=0.056      P<0.001 ** |
|INCIDENTAL TUMOR       |  P=0.098N     P=0.213N     P=0.185N     P=0.171N   |  P<0.001 **   P=0.149      P=0.118      P<0.001 ** |
|LOGISTIC REGRESSION    |  P=0.105N     P=0.210N     P=0.121N     P=0.175N   |  P<0.001 **   P=0.188      P=0.086      P<0.001 ** |
|COCHRAN-ARMITAGE       |  P<0.001N**                                        |  P<0.001 **                                        |
|FISHER EXACT           |               P=0.263N     P=0.201N     P<0.001N** |               P=0.111      P=0.053      P<0.001 ** |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE   7
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Liver                                                                                                                            |
|     Hepatocholangiocarcinoma                                                                                                    |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  3/50 (6%)    0/50 (0%)    1/50 (2%)    0/50 (0%)  |  2/50 (4%)    1/50 (2%)    0/50 (0%)    0/48 (0%)  |
|ADJUSTED (b)           |   8.7%         0.0%         2.4%         0.0%      |   5.6%         2.4%         0.0%         0.0%      |
|TERMINAL (d)           |  2/32 (6%)    0/31 (0%)    0/28 (0%)    0/12 (0%)  |  0/29 (0%)    0/33 (0%)    0/26 (0%)    0/32 (0%)  |
|FIRST INCIDENCE (DAYS) |   675          ---          574          ---       |   630          601          ---          ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.303N     P=0.132N     P=0.362N     P=0.329N   |  P=0.174N     P=0.467N     P=0.231N     P=0.243N   |
|INCIDENTAL TUMOR       |  P=0.260N     P=0.144N     P=0.313N     P=0.276N   |  P=0.114N     P=0.468N     P=0.140N     P=0.215N   |
|LOGISTIC REGRESSION    |  P=0.219N     P=0.130N     P=0.305N     P=0.291N   |  P=0.182N     P=0.511N     P=0.236N     P=0.246N   |
|COCHRAN-ARMITAGE       |  P=0.156N                                          |  P=0.174N                                          |
|FISHER EXACT           |               P=0.121N     P=0.309N     P=0.121N   |               P=0.500N     P=0.247N     P=0.258N   |
|=================================================================================================================================|
|                                                                                                                                 |
|Lung                                                                                                                             |
|     Alveolar/Bronchiolar Adenoma                                                                                                |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 18/50 (36%)   7/50 (14%)   8/50 (16%)   4/50 (8%)  |  1/50 (2%)    2/50 (4%)    4/50 (8%)    3/49 (6%)  |
|ADJUSTED (b)           |  51.0%        19.0%        26.6%        30.8%      |   3.4%         6.1%        14.2%         8.4%      |
|TERMINAL (d)           | 15/32 (47%)   3/31 (10%)   7/28 (25%)   3/12 (25%) |  1/29 (3%)    2/33 (6%)    3/26 (12%)   2/32 (6%)  |
|FIRST INCIDENCE (DAYS) |   582          554          512          721       |   733 (T)      733 (T)      690          574       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.230N     P=0.017N*    P=0.043N*    P=0.183N   |  P=0.332      P=0.545      P=0.158      P=0.344    |
|INCIDENTAL TUMOR       |  P=0.148N     P=0.017N*    P=0.038N*    P=0.129N   |  P=0.342      P=0.545      P=0.182      P=0.410    |
|LOGISTIC REGRESSION    |  P=0.137N     P=0.014N*    P=0.043N*    P=0.110N   |  P=0.321      P=0.545      P=0.186      P=0.330    |
|COCHRAN-ARMITAGE       |  P=0.004N**                                        |  P=0.294                                           |
|FISHER EXACT           |               P=0.010N**   P=0.020N*    P<0.001N** |               P=0.500      P=0.181      P=0.301    |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE   8
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Lung                                                                                                                             |
|     Alveolar/Bronchiolar Carcinoma                                                                                              |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  6/50 (12%)   9/50 (18%)   7/50 (14%)   3/50 (6%)  |  1/50 (2%)    1/50 (2%)    2/50 (4%)    2/49 (4%)  |
|ADJUSTED (b)           |  17.5%        25.4%        21.4%        19.6%      |   3.4%         3.0%         6.3%         5.6%      |
|TERMINAL (d)           |  5/32 (16%)   6/31 (19%)   4/28 (14%)   1/12 (8%)  |  1/29 (3%)    1/33 (3%)    1/26 (4%)    1/32 (3%)  |
|FIRST INCIDENCE (DAYS) |   557          532          554          658       |   733 (T)      733 (T)      610          604       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.538      P=0.261      P=0.408      P=0.509    |  P=0.400      P=0.733N     P=0.484      P=0.529    |
|INCIDENTAL TUMOR       |  P=0.519N     P=0.283      P=0.532      P=0.574    |  P=0.499      P=0.733N     P=0.528      P=0.620    |
|LOGISTIC REGRESSION    |  P=0.455N     P=0.263      P=0.455      P=0.619    |  P=0.396      P=0.733N     P=0.523      P=0.524    |
|COCHRAN-ARMITAGE       |  P=0.097N                                          |  P=0.375                                           |
|FISHER EXACT           |               P=0.288      P=0.500      P=0.243N   |               P=0.753N     P=0.500      P=0.492    |
|=================================================================================================================================|
|                                                                                                                                 |
|Lung                                                                                                                             |
|     Alveolar/Bronchiolar Carcinoma or Alveolar/Bronchiolar Adenoma                                                              |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 21/50 (42%)  16/50 (32%)  15/50 (30%)   7/50 (14%) |  2/50 (4%)    3/50 (6%)    5/50 (10%)   5/49 (10%) |
|ADJUSTED (b)           |  57.7%        41.1%        45.5%        46.0%      |   6.9%         9.1%        16.4%        13.7%      |
|TERMINAL (d)           | 17/32 (53%)   9/31 (29%)  11/28 (39%)   4/12 (33%) |  2/29 (7%)    3/33 (9%)    3/26 (12%)   3/32 (9%)  |
|FIRST INCIDENCE (DAYS) |   557          532          512          658       |   733 (T)      733 (T)      610          574       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.437N     P=0.270N     P=0.288N     P=0.444N   |  P=0.220      P=0.559      P=0.196      P=0.259    |
|INCIDENTAL TUMOR       |  P=0.250N     P=0.258N     P=0.199N     P=0.318N   |  P=0.279      P=0.559      P=0.241      P=0.354    |
|LOGISTIC REGRESSION    |  P=0.213N     P=0.248N     P=0.248N     P=0.280N   |  P=0.212      P=0.559      P=0.241      P=0.245    |
|COCHRAN-ARMITAGE       |  P=0.002N**                                        |  P=0.183                                           |
|FISHER EXACT           |               P=0.204N     P=0.149N     P=0.002N** |               P=0.500      P=0.218      P=0.210    |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE   9
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Ovary                                                                                                                            |
|     Cystadenoma                                                                                                                 |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |                                                    |  0/49 (0%)    0/50 (0%)    2/50 (4%)    1/46 (2%)  |
|ADJUSTED (b)           |                                                    |   0.0%         0.0%         7.7%         3.3%      |
|TERMINAL (d)           |                                                    |  0/29 (0%)    0/33 (0%)    2/26 (8%)    1/30 (3%)  |
|FIRST INCIDENCE (DAYS) |                                                    |   ---          ---          733 (T)      733 (T)   |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |                                                    |  P=0.351        (e)        P=0.214      P=0.507    |
|INCIDENTAL TUMOR       |                                                    |  P=0.351        (e)        P=0.214      P=0.507    |
|LOGISTIC REGRESSION    |                                                    |  P=0.351        (e)        P=0.214      P=0.507    |
|COCHRAN-ARMITAGE       |                                                    |  P=0.332                                           |
|FISHER EXACT           |                                                    |                 (e)        P=0.253      P=0.484    |
|=================================================================================================================================|
|                                                                                                                                 |
|Pituitary Gland: Pars Distalis or Unspecified Site                                                                               |
|     Adenoma                                                                                                                     |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  1/45 (2%)    0/47 (0%)    1/45 (2%)    0/47 (0%)  | 10/47 (21%)   8/48 (17%)  14/48 (29%)   8/48 (17%) |
|ADJUSTED (b)           |   3.2%         0.0%         2.3%         0.0%      |  32.7%        23.4%        47.3%        23.4%      |
|TERMINAL (d)           |  1/31 (3%)    0/30 (0%)    0/27 (0%)    0/12 (0%)  |  7/27 (26%)   6/31 (19%)  11/26 (42%)   6/32 (19%) |
|FIRST INCIDENCE (DAYS) |   733 (T)      ---          560          ---       |   651          582          599          631       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.648N     P=0.507N     P=0.740      P=0.689N   |  P=0.306N     P=0.292N     P=0.222      P=0.287N   |
|INCIDENTAL TUMOR       |  P=0.635N     P=0.507N     P=0.667N     P=0.689N   |  P=0.308N     P=0.331N     P=0.338      P=0.342N   |
|LOGISTIC REGRESSION    |  P=0.485N     P=0.507N     P=0.735N     P=0.689N   |  P=0.298N     P=0.285N     P=0.330      P=0.267N   |
|COCHRAN-ARMITAGE       |  P=0.454N                                          |  P=0.386N                                          |
|FISHER EXACT           |               P=0.489N     P=0.753N     P=0.489N   |               P=0.378N     P=0.259      P=0.378N   |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE  10
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Skin                                                                                                                             |
|     Sarcoma                                                                                                                     |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  0/50 (0%)    1/50 (2%)    0/50 (0%)    0/50 (0%)  |  0/50 (0%)    0/50 (0%)    1/50 (2%)    3/50 (6%)  |
|ADJUSTED (b)           |   0.0%         3.2%         0.0%         0.0%      |   0.0%         0.0%         2.4%         8.9%      |
|TERMINAL (d)           |  0/32 (0%)    1/31 (3%)    0/28 (0%)    0/12 (0%)  |  0/29 (0%)    0/33 (0%)    0/26 (0%)    2/32 (6%)  |
|FIRST INCIDENCE (DAYS) |   ---          733 (T)      ---          ---       |   ---          ---          574          631       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.749N     P=0.494        (e)          (e)      |  P=0.025 *      (e)        P=0.515      P=0.136    |
|INCIDENTAL TUMOR       |  P=0.749N     P=0.494        (e)          (e)      |  P=0.054        (e)        P=0.594      P=0.186    |
|LOGISTIC REGRESSION    |  P=0.749N     P=0.494        (e)          (e)      |  P=0.022 *      (e)        P=0.476      P=0.135    |
|COCHRAN-ARMITAGE       |  P=0.585N                                          |  P=0.021 *                                         |
|FISHER EXACT           |               P=0.500        (e)          (e)      |                 (e)        P=0.500      P=0.121    |
|=================================================================================================================================|
|                                                                                                                                 |
|Stomach, Forestomach                                                                                                             |
|     Squamous Cell Papilloma                                                                                                     |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  0/50 (0%)    0/50 (0%)    0/50 (0%)    0/50 (0%)  |  1/50 (2%)    2/50 (4%)    0/50 (0%)    0/50 (0%)  |
|ADJUSTED (b)           |   0.0%         0.0%         0.0%         0.0%      |   3.4%         6.1%         0.0%         0.0%      |
|TERMINAL (d)           |  0/32 (0%)    0/31 (0%)    0/28 (0%)    0/12 (0%)  |  1/29 (3%)    2/33 (6%)    0/26 (0%)    0/32 (0%)  |
|FIRST INCIDENCE (DAYS) |   ---          ---          ---          ---       |   733 (T)      733 (T)      ---          ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |    (e)          (e)          (e)          (e)      |  P=0.209N     P=0.545      P=0.522N     P=0.480N   |
|INCIDENTAL TUMOR       |    (e)          (e)          (e)          (e)      |  P=0.209N     P=0.545      P=0.522N     P=0.480N   |
|LOGISTIC REGRESSION    |    (e)          (e)          (e)          (e)      |  P=0.209N     P=0.545      P=0.522N     P=0.480N   |
|COCHRAN-ARMITAGE       |    (e)                                             |  P=0.214N                                          |
|FISHER EXACT           |                 (e)          (e)          (e)      |               P=0.500      P=0.500N     P=0.500N   |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE  11
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Thyroid Gland: C-Cell                                                                                                            |
|     Carcinoma                                                                                                                   |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  0/49 (0%)    0/50 (0%)    0/49 (0%)    0/49 (0%)  |  0/50 (0%)    0/50 (0%)    0/49 (0%)    2/47 (4%)  |
|ADJUSTED (b)           |   0.0%         0.0%         0.0%         0.0%      |   0.0%         0.0%         0.0%         6.3%      |
|TERMINAL (d)           |  0/32 (0%)    0/31 (0%)    0/28 (0%)    0/12 (0%)  |  0/29 (0%)    0/33 (0%)    0/26 (0%)    2/32 (6%)  |
|FIRST INCIDENCE (DAYS) |   ---          ---          ---          ---       |   ---          ---          ---          733 (T)   |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |    (e)          (e)          (e)          (e)      |  P=0.049 *      (e)          (e)        P=0.260    |
|INCIDENTAL TUMOR       |    (e)          (e)          (e)          (e)      |  P=0.049 *      (e)          (e)        P=0.260    |
|LOGISTIC REGRESSION    |    (e)          (e)          (e)          (e)      |  P=0.049 *      (e)          (e)        P=0.260    |
|COCHRAN-ARMITAGE       |    (e)                                             |  P=0.037 *                                         |
|FISHER EXACT           |                 (e)          (e)          (e)      |                 (e)          (e)        P=0.232    |
|=================================================================================================================================|
|                                                                                                                                 |
|Thyroid Gland: C-Cell                                                                                                            |
|     Carcinoma or Adenoma                                                                                                        |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  0/49 (0%)    0/50 (0%)    0/49 (0%)    0/49 (0%)  |  1/50 (2%)    0/50 (0%)    0/49 (0%)    2/47 (4%)  |
|ADJUSTED (b)           |   0.0%         0.0%         0.0%         0.0%      |   3.4%         0.0%         0.0%         6.3%      |
|TERMINAL (d)           |  0/32 (0%)    0/31 (0%)    0/28 (0%)    0/12 (0%)  |  1/29 (3%)    0/33 (0%)    0/26 (0%)    2/32 (6%)  |
|FIRST INCIDENCE (DAYS) |   ---          ---          ---          ---       |   733 (T)      ---          ---          733 (T)   |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |    (e)          (e)          (e)          (e)      |  P=0.206      P=0.474N     P=0.522N     P=0.535    |
|INCIDENTAL TUMOR       |    (e)          (e)          (e)          (e)      |  P=0.206      P=0.474N     P=0.522N     P=0.535    |
|LOGISTIC REGRESSION    |    (e)          (e)          (e)          (e)      |  P=0.206      P=0.474N     P=0.522N     P=0.535    |
|COCHRAN-ARMITAGE       |    (e)                                             |  P=0.177                                           |
|FISHER EXACT           |                 (e)          (e)          (e)      |               P=0.500N     P=0.505N     P=0.477    |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE  12
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Thyroid Gland: Follicular Cell                                                                                                   |
|     Adenoma                                                                                                                     |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  4/49 (8%)    0/50 (0%)    1/49 (2%)    1/49 (2%)  |  2/50 (4%)    1/50 (2%)    3/49 (6%)    1/47 (2%)  |
|ADJUSTED (b)           |  12.5%         0.0%         3.6%         7.1%      |   6.9%         3.0%         9.1%         3.1%      |
|TERMINAL (d)           |  4/32 (13%)   0/31 (0%)    1/28 (4%)    0/12 (0%)  |  2/29 (7%)    1/33 (3%)    1/26 (4%)    1/32 (3%)  |
|FIRST INCIDENCE (DAYS) |   733 (T)      ---          733 (T)      715       |   733 (T)      733 (T)      599          733 (T)   |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.613N     P=0.066N     P=0.220N     P=0.548N   |  P=0.451N     P=0.455N     P=0.481      P=0.465N   |
|INCIDENTAL TUMOR       |  P=0.567N     P=0.066N     P=0.220N     P=0.492N   |  P=0.443N     P=0.455N     P=0.558      P=0.465N   |
|LOGISTIC REGRESSION    |  P=0.590N     P=0.066N     P=0.220N     P=0.517N   |  P=0.460N     P=0.455N     P=0.530      P=0.465N   |
|COCHRAN-ARMITAGE       |  P=0.299N                                          |  P=0.494N                                          |
|FISHER EXACT           |               P=0.056N     P=0.181N     P=0.181N   |               P=0.500N     P=0.490      P=0.523N   |
|=================================================================================================================================|
|                                                                                                                                 |
|Thyroid Gland: Follicular Cell                                                                                                   |
|     Carcinoma or Adenoma                                                                                                        |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  4/49 (8%)    0/50 (0%)    1/49 (2%)    1/49 (2%)  |  3/50 (6%)    1/50 (2%)    3/49 (6%)    1/47 (2%)  |
|ADJUSTED (b)           |  12.5%         0.0%         3.6%         7.1%      |  10.3%         3.0%         9.1%         3.1%      |
|TERMINAL (d)           |  4/32 (13%)   0/31 (0%)    1/28 (4%)    0/12 (0%)  |  3/29 (10%)   1/33 (3%)    1/26 (4%)    1/32 (3%)  |
|FIRST INCIDENCE (DAYS) |   733 (T)      ---          733 (T)      715       |   733 (T)      733 (T)      599          733 (T)   |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.613N     P=0.066N     P=0.220N     P=0.548N   |  P=0.325N     P=0.259N     P=0.637      P=0.269N   |
|INCIDENTAL TUMOR       |  P=0.567N     P=0.066N     P=0.220N     P=0.492N   |  P=0.317N     P=0.259N     P=0.622N     P=0.269N   |
|LOGISTIC REGRESSION    |  P=0.590N     P=0.066N     P=0.220N     P=0.517N   |  P=0.331N     P=0.259N     P=0.633N     P=0.269N   |
|COCHRAN-ARMITAGE       |  P=0.299N                                          |  P=0.365N                                          |
|FISHER EXACT           |               P=0.056N     P=0.181N     P=0.181N   |               P=0.309N     P=0.651      P=0.332N   |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE  13
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Uterus                                                                                                                           |
|     Polyp Stromal                                                                                                               |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |                                                    |  1/50 (2%)    4/50 (8%)    2/50 (4%)    1/50 (2%)  |
|ADJUSTED (b)           |                                                    |   2.9%        10.6%         6.7%         2.3%      |
|TERMINAL (d)           |                                                    |  0/29 (0%)    2/33 (6%)    1/26 (4%)    0/32 (0%)  |
|FIRST INCIDENCE (DAYS) |                                                    |   651          526          680          577       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |                                                    |  P=0.328N     P=0.221      P=0.501      P=0.747N   |
|INCIDENTAL TUMOR       |                                                    |  P=0.371N     P=0.135      P=0.606      P=0.759N   |
|LOGISTIC REGRESSION    |                                                    |  P=0.336N     P=0.186      P=0.522      P=0.753    |
|COCHRAN-ARMITAGE       |                                                    |  P=0.340N                                          |
|FISHER EXACT           |                                                    |               P=0.181      P=0.500      P=0.753N   |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Hemangiosarcoma                                                                                                             |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  1/50 (2%)    2/50 (4%)    2/50 (4%)    1/50 (2%)  |  1/50 (2%)    3/50 (6%)    2/50 (4%)    0/50 (0%)  |
|ADJUSTED (b)           |   3.1%         6.2%         7.1%         8.3%      |   2.6%         8.5%         7.7%         0.0%      |
|TERMINAL (d)           |  1/32 (3%)    1/31 (3%)    2/28 (7%)    1/12 (8%)  |  0/29 (0%)    2/33 (6%)    2/26 (8%)    0/32 (0%)  |
|FIRST INCIDENCE (DAYS) |   733 (T)      706          733 (T)      733 (T)   |   599          640          733 (T)      ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.448      P=0.489      P=0.453      P=0.529    |  P=0.183N     P=0.347      P=0.481      P=0.490N   |
|INCIDENTAL TUMOR       |  P=0.490      P=0.459      P=0.453      P=0.529    |  P=0.127N     P=0.390      P=0.528      P=0.326N   |
|LOGISTIC REGRESSION    |  P=0.473      P=0.477      P=0.453      P=0.529    |  P=0.175N     P=0.324      P=0.522      P=0.525N   |
|COCHRAN-ARMITAGE       |  P=0.524N                                          |  P=0.187N                                          |
|FISHER EXACT           |               P=0.500      P=0.500      P=0.753N   |               P=0.309      P=0.500      P=0.500N   |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE  14
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Hemangiosarcoma or Hemangioma                                                                                               |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  2/50 (4%)    2/50 (4%)    3/50 (6%)    1/50 (2%)  |  2/50 (4%)    3/50 (6%)    3/50 (6%)    0/50 (0%)  |
|ADJUSTED (b)           |   5.9%         6.2%        10.7%         8.3%      |   4.9%         8.5%        11.5%         0.0%      |
|TERMINAL (d)           |  1/32 (3%)    1/31 (3%)    3/28 (11%)   1/12 (8%)  |  0/29 (0%)    2/33 (6%)    3/26 (12%)   0/32 (0%)  |
|FIRST INCIDENCE (DAYS) |   699          706          733 (T)      733 (T)   |   495          640          733 (T)      ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.529      P=0.679      P=0.434      P=0.673    |  P=0.124N     P=0.549      P=0.483      P=0.220N   |
|INCIDENTAL TUMOR       |  P=0.596      P=0.637      P=0.391      P=0.724    |  P=0.095N     P=0.564      P=0.512      P=0.191N   |
|LOGISTIC REGRESSION    |  P=0.559      P=0.673      P=0.422      P=0.698    |  P=0.121N     P=0.497      P=0.513      P=0.283N   |
|COCHRAN-ARMITAGE       |  P=0.378N                                          |  P=0.128N                                          |
|FISHER EXACT           |               P=0.691N     P=0.500      P=0.500N   |               P=0.500      P=0.500      P=0.247N   |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Histiocytic Sarcoma                                                                                                         |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  1/50 (2%)    0/50 (0%)    1/50 (2%)    0/50 (0%)  |  3/50 (6%)    0/50 (0%)    2/50 (4%)    0/50 (0%)  |
|ADJUSTED (b)           |   3.1%         0.0%         3.6%         0.0%      |   7.6%         0.0%         6.2%         0.0%      |
|TERMINAL (d)           |  1/32 (3%)    0/31 (0%)    1/28 (4%)    0/12 (0%)  |  0/29 (0%)    0/33 (0%)    1/26 (4%)    0/32 (0%)  |
|FIRST INCIDENCE (DAYS) |   733 (T)      ---          733 (T)      ---       |   442          ---          594          ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.668N     P=0.506N     P=0.732      P=0.695N   |  P=0.170N     P=0.109N     P=0.487N     P=0.113N   |
|INCIDENTAL TUMOR       |  P=0.668N     P=0.506N     P=0.732      P=0.695N   |  P=0.134N     P=0.139N     P=0.381N     P=0.131N   |
|LOGISTIC REGRESSION    |  P=0.668N     P=0.506N     P=0.732      P=0.695N   |  P=0.194N     P=0.140N     P=0.528N     P=0.145N   |
|COCHRAN-ARMITAGE       |  P=0.459N                                          |  P=0.173N                                          |
|FISHER EXACT           |               P=0.500N     P=0.753N     P=0.500N   |               P=0.121N     P=0.500N     P=0.121N   |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE  15
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Malignant Lymphoma: Histiocytic, Lymphocytic, Mixed, NOS, or Undifferentiated                                               |
|     Cell Type                                                                                                                   |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  2/50 (4%)    1/50 (2%)    2/50 (4%)    0/50 (0%)  |  7/50 (14%)   2/50 (4%)    4/50 (8%)    5/50 (10%) |
|ADJUSTED (b)           |   6.3%         3.2%         7.1%         0.0%      |  21.4%         5.5%        12.7%        13.3%      |
|TERMINAL (d)           |  2/32 (6%)    1/31 (3%)    2/28 (7%)    0/12 (0%)  |  5/29 (17%)   1/33 (3%)    2/26 (8%)    2/32 (6%)  |
|FIRST INCIDENCE (DAYS) |   733 (T)      733 (T)      733 (T)      ---       |   502          635          631          599       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.445N     P=0.511N     P=0.647      P=0.471N   |  P=0.573N     P=0.059N     P=0.288N     P=0.324N   |
|INCIDENTAL TUMOR       |  P=0.445N     P=0.511N     P=0.647      P=0.471N   |  P=0.426N     P=0.054N     P=0.229N     P=0.192N   |
|LOGISTIC REGRESSION    |  P=0.445N     P=0.511N     P=0.647      P=0.471N   |  P=0.576N     P=0.066N     P=0.227N     P=0.343N   |
|COCHRAN-ARMITAGE       |  P=0.209N                                          |  P=0.570                                           |
|FISHER EXACT           |               P=0.500N     P=0.691N     P=0.247N   |               P=0.080N     P=0.262N     P=0.380N   |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Osteosarcoma                                                                                                                |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  0/50 (0%)    0/50 (0%)    0/50 (0%)    0/50 (0%)  |  1/50 (2%)    1/50 (2%)    0/50 (0%)    2/50 (4%)  |
|ADJUSTED (b)           |   0.0%         0.0%         0.0%         0.0%      |   3.4%         3.0%         0.0%         5.5%      |
|TERMINAL (d)           |  0/32 (0%)    0/31 (0%)    0/28 (0%)    0/12 (0%)  |  1/29 (3%)    1/33 (3%)    0/26 (0%)    1/32 (3%)  |
|FIRST INCIDENCE (DAYS) |   ---          ---          ---          ---       |   733 (T)      733 (T)      ---          598       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |    (e)          (e)          (e)          (e)      |  P=0.350      P=0.733N     P=0.522N     P=0.532    |
|INCIDENTAL TUMOR       |    (e)          (e)          (e)          (e)      |  P=0.408      P=0.733N     P=0.522N     P=0.620    |
|LOGISTIC REGRESSION    |    (e)          (e)          (e)          (e)      |  P=0.347      P=0.733N     P=0.522N     P=0.527    |
|COCHRAN-ARMITAGE       |    (e)                                             |  P=0.332                                           |
|FISHER EXACT           |                 (e)          (e)          (e)      |               P=0.753N     P=0.500N     P=0.500    |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE  16
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Osteosarcoma or Osteoma                                                                                                     |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  0/50 (0%)    0/50 (0%)    0/50 (0%)    0/50 (0%)  |  1/50 (2%)    1/50 (2%)    0/50 (0%)    2/50 (4%)  |
|ADJUSTED (b)           |   0.0%         0.0%         0.0%         0.0%      |   3.4%         3.0%         0.0%         5.5%      |
|TERMINAL (d)           |  0/32 (0%)    0/31 (0%)    0/28 (0%)    0/12 (0%)  |  1/29 (3%)    1/33 (3%)    0/26 (0%)    1/32 (3%)  |
|FIRST INCIDENCE (DAYS) |   ---          ---          ---          ---       |   733 (T)      733 (T)      ---          598       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |    (e)          (e)          (e)          (e)      |  P=0.350      P=0.733N     P=0.522N     P=0.532    |
|INCIDENTAL TUMOR       |    (e)          (e)          (e)          (e)      |  P=0.408      P=0.733N     P=0.522N     P=0.620    |
|LOGISTIC REGRESSION    |    (e)          (e)          (e)          (e)      |  P=0.347      P=0.733N     P=0.522N     P=0.527    |
|COCHRAN-ARMITAGE       |    (e)                                             |  P=0.332                                           |
|FISHER EXACT           |                 (e)          (e)          (e)      |               P=0.753N     P=0.500N     P=0.500    |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Benign Tumors                                                                                                               |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 36/50 (72%)  27/50 (54%)  26/50 (52%)  17/50 (34%) | 21/50 (42%)  29/50 (58%)  31/50 (62%)  37/50 (74%) |
|ADJUSTED (b)           |  85.4%        70.5%        75.7%        71.6%      |  56.6%        72.4%        85.6%        85.7%      |
|TERMINAL (d)           | 26/32 (81%)  20/31 (65%)  20/28 (71%)   6/12 (50%) | 13/29 (45%)  22/33 (67%)  21/26 (81%)  26/32 (81%) |
|FIRST INCIDENCE (DAYS) |   362          324          440          245       |   495          526          469          399       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.187      P=0.109N     P=0.176N     P=0.336    |  P=0.014 *    P=0.235      P=0.031 *    P=0.016 *  |
|INCIDENTAL TUMOR       |  P=0.161N     P=0.066N     P=0.157N     P=0.136N   |  P=0.005 **   P=0.072      P=0.062      P=0.004 ** |
|LOGISTIC REGRESSION    |  P=0.327N     P=0.056N     P=0.103N     P=0.167N   |  P=0.005 **   P=0.159      P=0.064      P=0.004 ** |
|COCHRAN-ARMITAGE       |  P<0.001N**                                        |  P=0.002 **                                        |
|FISHER EXACT           |               P=0.048N*    P=0.032N*    P<0.001N** |               P=0.081      P=0.036 *    P=0.001 ** |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE  17
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   CONTROL      200 PPM      600 PPM      1800 PPM  |   CONTROL      200 PPM      600 PPM      1800 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Malignant Tumors                                                                                                            |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 24/50 (48%)  25/50 (50%)  26/50 (52%)  12/50 (24%) | 21/50 (42%)  18/50 (36%)  21/50 (42%)  28/50 (56%) |
|ADJUSTED (b)           |  56.0%        55.7%        57.5%        65.2%      |  51.6%        44.4%        54.8%        64.6%      |
|TERMINAL (d)           | 14/32 (44%)  12/31 (39%)  10/28 (36%)   6/12 (50%) | 10/29 (34%)  11/33 (33%)  10/26 (38%)  17/32 (53%) |
|FIRST INCIDENCE (DAYS) |   481          441          376          359       |   442          552          544          562       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.290      P=0.424      P=0.261      P=0.306    |  P=0.091      P=0.227N     P=0.537      P=0.258    |
|INCIDENTAL TUMOR       |  P=0.348N     P=0.516      P=0.490N     P=0.552N   |  P=0.171      P=0.235N     P=0.318N     P=0.388    |
|LOGISTIC REGRESSION    |  P=0.430N     P=0.504      P=0.547N     P=0.570    |  P=0.098      P=0.211N     P=0.344N     P=0.280    |
|COCHRAN-ARMITAGE       |  P=0.002N**                                        |  P=0.036 *                                         |
|FISHER EXACT           |               P=0.500      P=0.421      P=0.011N*  |               P=0.341N     P=0.580N     P=0.115    |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Malignant and Benign Tumors                                                                                                 |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 47/50 (94%)  39/50 (78%)  44/50 (88%)  21/50 (42%) | 34/50 (68%)  38/50 (76%)  41/50 (82%)  44/50 (88%) |
|ADJUSTED (b)           |  95.9%        82.7%        93.4%        86.7%      |  79.0%        86.3%        95.3%        93.5%      |
|TERMINAL (d)           | 30/32 (94%)  23/31 (74%)  25/28 (89%)   9/12 (75%) | 20/29 (69%)  27/33 (82%)  24/26 (92%)  29/32 (91%) |
|FIRST INCIDENCE (DAYS) |   362          324          376          245       |   442          526          469          399       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.224      P=0.216N     P=0.388      P=0.386    |  P=0.131      P=0.546N     P=0.115      P=0.188    |
|INCIDENTAL TUMOR       |  P=0.013N*    P=0.023N*    P=0.300N     P=0.010N*  |  P=0.124      P=0.415      P=0.272      P=0.151    |
|LOGISTIC REGRESSION    |  P=0.017N*    P=0.020N*    P=0.225N     P=0.011N*  |  P=0.049 *    P=0.490      P=0.204      P=0.059    |
|COCHRAN-ARMITAGE       |  P<0.001N**                                        |  P=0.016 *                                         |
|FISHER EXACT           |               P=0.020N*    P=0.243N     P<0.001N** |               P=0.252      P=0.083      P=0.014 *  |
|=================================================================================================================================|
         DATE: 02/21/96                     EXPERIMENT: 05181 TEST: 04                                                 PAGE  18
                               STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- TETRAHYDROFURAN
                                                 TERMINAL SACRIFICE AT 105 WEEKS
 (a)  Number of tumor-bearing animals / number of animals examined at site.
 (b)  Kaplan-Meier estimated lifetime tumor incidence after adjustment for 
      intercurrent mortality.
 (d)  Observed incidence at terminal kill.
 (f)  Beneath the control incidence are the P-values associated with the trend 
      test.  Beneath the dosed group incidence are the P-values corresponding to 
      pairwise comparisons between the controls and that dosed group.  The life
      table analysis regards tumors in animals dying  prior to terminal kill as
      being (directly or indirectly) the cause of death.  The incidental tumor 
      test regards these lesions as non-fatal.  Logistic regression is an alternative
      method for analyzing the incidence of non-fatal tumors.  The Cochran-Armitage
      and Fisher's exact tests compare directly the overall incidence rates.  
      For all tests, a negative trend is indicated by "N".
 (e)  Value of Statistic cannot be computed. 
 (I)  Interim sacrifice
 (T)  Terminal sacrifice
  #   Tumor rates based on number of animals necropsied.
  *   To the right of any statistical result, indicates significance at (P<=0.05).
  **  To the right of any statistical result, indicates significance at (P<=0.01).