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TDMS Study 05165-02 Pathology Tables

NTP                                        STATISTICAL ANALYSIS OF PRIMARY TUMORS                              REPORT: PEIRPT08     
LAB: Battelle Columbus                              4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)                           DATE: 11/09/95       
EXPERIMENT: 05165 TEST: 02                                                                                     TIME: 20:39:02       
TEST TYPE:  CHRONIC                             CAGES FROM 0000 TO LAST CAGE                                   PAGE:       1        
CONT: N01-ES-65156                              ROUTE: DOSED FEED                                              NTP C#: 61610B       
PATHOLOGIST: R. PERSING                                                                                        CAS: 96-69-5         
------------------------------------------------------------------------------------------------------------------------------------
               REASONS FOR REMOVAL:    ALL                                                                                          
               REMOVAL DATE RANGE:     ALL                                                                                          
               TREATMENT GROUPS:       INCLUDE ALL                                                                                  
NTP                                        STATISTICAL ANALYSIS OF PRIMARY TUMORS                              REPORT: PEIRPT08     
LAB: Battelle Columbus                              4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)                           DATE: 11/09/95       
EXPERIMENT: 05165 TEST: 02                                                                                     TIME: 20:39:02       
TEST TYPE:  CHRONIC                             CAGES FROM 0000 TO LAST CAGE                                                        
CONT: N01-ES-65156                              ROUTE: DOSED FEED                                              NTP C#: 61610B       
PATHOLOGIST: R. PERSING                                                                                        CAS: 96-69-5         
                                                    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
                                                    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 Columbus                              4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)                           DATE: 11/09/95       
EXPERIMENT: 05165 TEST: 02                                                                                     TIME: 20:39:02       
TEST TYPE:  CHRONIC                             CAGES FROM 0000 TO LAST CAGE                                                        
CONT: N01-ES-65156                              ROUTE: DOSED FEED                                              NTP C#: 61610B       
PATHOLOGIST: R. PERSING                                                                                        CAS: 96-69-5         
                                     SUMMARY OF STATISTICALLY SIGNIFICANT (P<=.05) RESULTS
                                IN THE ANALYSIS OF THE STUDY OF 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
              ====================================================================================================
                                                           MALE MICE
                                                          -------------
                  ORGAN                               MORPHOLOGY
                 -------                             ------------
              Liver                         Hepatocellular Carcinoma
                                            Hepatocellular Carcinoma or Hepatocellular Adenoma
                                            Hepatocellular Carcinoma, Hepatocellular Adenoma, or Hepatoblastoma
              Lung                          Alveolar/Bronchiolar Carcinoma or Alveolar/Bronchiolar Adenoma
              All Organs                    Malignant Lymphoma: Histiocytic, Lymphocytic, Mixed, NOS, or Undifferentiated
                                             Cell Type
                                            Benign Tumors
                                            Malignant and Benign Tumors
              ====================================================================================================
                                                           FEMALE MICE
                                                          -------------
                  ORGAN                               MORPHOLOGY
                 -------                             ------------
              Liver                         Hepatocellular Adenoma
              Ovary                         Teratoma Benign
              All Organs                    Hemangiosarcoma or Hemangioma
              ====================================================================================================
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE   1
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Adrenal Cortex                                                                                                                   |
|     Adenoma                                                                                                                     |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 11/60 (18%)   7/60 (12%)   8/60 (13%)   6/60 (10%) |  1/60 (2%)    0/59 (0%)    0/60 (0%)    2/60 (3%)  |
|ADJUSTED (b)           |  25.3%        16.7%        15.7%        13.0%      |   2.5%         0.0%         0.0%         4.5%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    1/10 (10%)   0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    1/10 (10%) |
|TERMINAL (d)           | 10/42 (24%)   7/42 (17%)   7/49 (14%)   5/45 (11%) |  1/40 (3%)    0/38 (0%)    0/36 (0%)    1/35 (3%)  |
|FIRST INCIDENCE (DAYS) |   508          729 (T)      456 (I)      724       |   729 (T)      ---          ---          457 (I)   |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.109N     P=0.219N     P=0.203N     P=0.116N   |  P=0.237      P=0.510N     P=0.521N     P=0.481    |
|INCIDENTAL TUMOR       |  P=0.150N     P=0.192N     P=0.275N     P=0.192N   |  P=0.237      P=0.510N     P=0.521N     P=0.481    |
|LOGISTIC REGRESSION    |  P=0.130N     P=0.236N     P=0.284N     P=0.131N   |  P=0.252      P=0.510N     P=0.521N     P=0.504    |
|COCHRAN-ARMITAGE       |  P=0.152N                                          |  P=0.247                                           |
|FISHER EXACT           |               P=0.222N     P=0.309N     P=0.148N   |               P=0.504N     P=0.500N     P=0.500    |
|=================================================================================================================================|
|                                                                                                                                 |
|Adrenal Medulla                                                                                                                  |
|     Pheochromocytoma Benign                                                                                                     |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  0/60 (0%)    0/60 (0%)    0/60 (0%)    0/60 (0%)  |  0/58 (0%)    2/59 (3%)    2/60 (3%)    2/60 (3%)  |
|ADJUSTED (b)           |   0.0%         0.0%         0.0%         0.0%      |   0.0%         5.3%         5.6%         5.7%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    0/10 (0%)    0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  0/42 (0%)    0/42 (0%)    0/49 (0%)    0/45 (0%)  |  0/38 (0%)    2/38 (5%)    2/36 (6%)    2/35 (6%)  |
|FIRST INCIDENCE (DAYS) |   ---          ---          ---          ---       |   ---          729 (T)      729 (T)      729 (T)   |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |    (e)          (e)          (e)          (e)      |  P=0.214      P=0.238      P=0.226      P=0.220    |
|INCIDENTAL TUMOR       |    (e)          (e)          (e)          (e)      |  P=0.214      P=0.238      P=0.226      P=0.220    |
|LOGISTIC REGRESSION    |    (e)          (e)          (e)          (e)      |  P=0.214      P=0.238      P=0.226      P=0.220    |
|COCHRAN-ARMITAGE       |    (e)                                             |  P=0.252                                           |
|FISHER EXACT           |                 (e)          (e)          (e)      |               P=0.252      P=0.256      P=0.256    |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE   2
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Adrenal Medulla                                                                                                                  |
|     Pheochromocytoma: Benign, Complex, Malignant, NOS                                                                           |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  0/60 (0%)    0/60 (0%)    1/60 (2%)    0/60 (0%)  |  0/58 (0%)    3/59 (5%)    2/60 (3%)    2/60 (3%)  |
|ADJUSTED (b)           |   0.0%         0.0%         2.0%         0.0%      |   0.0%         6.9%         5.6%         5.7%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    0/10 (0%)    0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  0/42 (0%)    0/42 (0%)    1/49 (2%)    0/45 (0%)  |  0/38 (0%)    2/38 (5%)    2/36 (6%)    2/35 (6%)  |
|FIRST INCIDENCE (DAYS) |   ---          ---          729 (T)      ---       |   ---          450          729 (T)      729 (T)   |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.707        (e)        P=0.531        (e)      |  P=0.297      P=0.125      P=0.226      P=0.220    |
|INCIDENTAL TUMOR       |  P=0.707        (e)        P=0.531        (e)      |  P=0.186      P=0.084      P=0.226      P=0.220    |
|LOGISTIC REGRESSION    |  P=0.707        (e)        P=0.531        (e)      |  P=0.325      P=0.118      P=0.226      P=0.220    |
|COCHRAN-ARMITAGE       |  P=0.694                                           |  P=0.337                                           |
|FISHER EXACT           |                 (e)        P=0.500        (e)      |               P=0.125      P=0.256      P=0.256    |
|=================================================================================================================================|
|                                                                                                                                 |
|Harderian Gland                                                                                                                  |
|     Adenoma                                                                                                                     |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  1/60 (2%)    3/60 (5%)    2/60 (3%)    0/60 (0%)  |  0/60 (0%)    1/59 (2%)    1/60 (2%)    1/60 (2%)  |
|ADJUSTED (b)           |   2.4%         7.1%         4.1%         0.0%      |   0.0%         2.6%         2.6%         2.1%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    0/10 (0%)    0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  1/42 (2%)    3/42 (7%)    2/49 (4%)    0/45 (0%)  |  0/40 (0%)    0/38 (0%)    0/36 (0%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |   729 (T)      729 (T)      729 (T)      ---       |   ---          723          701          565       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.216N     P=0.305      P=0.554      P=0.486N   |  P=0.360      P=0.490      P=0.481      P=0.504    |
|INCIDENTAL TUMOR       |  P=0.216N     P=0.305      P=0.554      P=0.486N   |  P=0.522      P=0.669      P=0.695      P=0.581    |
|LOGISTIC REGRESSION    |  P=0.215N     P=0.305      P=0.554      P=0.486N   |  P=0.384      P=0.500      P=0.498      P=0.522    |
|COCHRAN-ARMITAGE       |  P=0.242N                                          |  P=0.386                                           |
|FISHER EXACT           |               P=0.309      P=0.500      P=0.500N   |               P=0.496      P=0.500      P=0.500    |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE   3
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Harderian Gland                                                                                                                  |
|     Carcinoma                                                                                                                   |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  2/60 (3%)    0/60 (0%)    1/60 (2%)    0/60 (0%)  |  1/60 (2%)    2/59 (3%)    0/60 (0%)    0/60 (0%)  |
|ADJUSTED (b)           |   4.5%         0.0%         2.0%         0.0%      |   2.5%         5.3%         0.0%         0.0%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    0/10 (0%)    0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  1/42 (2%)    0/42 (0%)    1/49 (2%)    0/45 (0%)  |  1/40 (3%)    2/38 (5%)    0/36 (0%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |   683          ---          729 (T)      ---       |   729 (T)      729 (T)      ---          ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.175N     P=0.247N     P=0.457N     P=0.230N   |  P=0.211N     P=0.482      P=0.521N     P=0.527N   |
|INCIDENTAL TUMOR       |  P=0.233N     P=0.314N     P=0.640N     P=0.305N   |  P=0.211N     P=0.482      P=0.521N     P=0.527N   |
|LOGISTIC REGRESSION    |  P=0.181N     P=0.242N     P=0.484N     P=0.234N   |  P=0.211N     P=0.482      P=0.521N     P=0.527N   |
|COCHRAN-ARMITAGE       |  P=0.188N                                          |  P=0.188N                                          |
|FISHER EXACT           |               P=0.248N     P=0.500N     P=0.248N   |               P=0.494      P=0.500N     P=0.500N   |
|=================================================================================================================================|
|                                                                                                                                 |
|Harderian Gland                                                                                                                  |
|     Carcinoma or Adenoma                                                                                                        |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  3/60 (5%)    3/60 (5%)    3/60 (5%)    0/60 (0%)  |  1/60 (2%)    3/59 (5%)    1/60 (2%)    1/60 (2%)  |
|ADJUSTED (b)           |   6.8%         7.1%         6.1%         0.0%      |   2.5%         7.7%         2.6%         2.1%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    0/10 (0%)    0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  2/42 (5%)    3/42 (7%)    3/49 (6%)    0/45 (0%)  |  1/40 (3%)    2/38 (5%)    0/36 (0%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |   683          729 (T)      729 (T)      ---       |   729 (T)      723          701          565       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.077N     P=0.656      P=0.596N     P=0.114N   |  P=0.487N     P=0.289      P=0.738      P=0.748    |
|INCIDENTAL TUMOR       |  P=0.096N     P=0.610      P=0.615      P=0.153N   |  P=0.370N     P=0.364      P=0.673N     P=0.732N   |
|LOGISTIC REGRESSION    |  P=0.081N     P=0.651      P=0.633N     P=0.116N   |  P=0.457N     P=0.296      P=0.757      P=0.762N   |
|COCHRAN-ARMITAGE       |  P=0.093N                                          |  P=0.442N                                          |
|FISHER EXACT           |               P=0.660N     P=0.660N     P=0.122N   |               P=0.303      P=0.752N     P=0.752N   |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE   4
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Liver                                                                                                                            |
|     Hepatocellular Adenoma                                                                                                      |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 17/60 (28%)  24/60 (40%)  26/60 (43%)  14/60 (23%) | 20/60 (33%)  18/59 (31%)  18/60 (30%)  11/60 (18%) |
|ADJUSTED (b)           |  39.5%        52.7%        48.6%        29.1%      |  45.5%        45.7%        48.1%        29.8%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    2/10 (20%)   4/10 (40%)   2/10 (20%) |  3/9 (33%)    1/9 (11%)    1/10 (10%)   1/10 (10%) |
|TERMINAL (d)           | 16/42 (38%)  21/42 (50%)  22/49 (45%)  12/45 (27%) | 17/40 (43%)  17/38 (45%)  17/36 (47%)  10/35 (29%) |
|FIRST INCIDENCE (DAYS) |   690          456 (I)      456 (I)      456 (I)   |   457 (I)      457 (I)      457 (I)      457 (I)   |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.123N     P=0.113      P=0.165      P=0.262N   |  P=0.067N     P=0.489N     P=0.549N     P=0.080N   |
|INCIDENTAL TUMOR       |  P=0.132N     P=0.119      P=0.129      P=0.287N   |  P=0.067N     P=0.489N     P=0.549N     P=0.080N   |
|LOGISTIC REGRESSION    |  P=0.181N     P=0.094      P=0.075      P=0.310N   |  P=0.046N*    P=0.407N     P=0.430N     P=0.054N   |
|COCHRAN-ARMITAGE       |  P=0.210N                                          |  P=0.036N*                                         |
|FISHER EXACT           |               P=0.124      P=0.064      P=0.339N   |               P=0.447N     P=0.422N     P=0.047N*  |
|=================================================================================================================================|
|                                                                                                                                 |
|Liver                                                                                                                            |
|     Hepatocellular Carcinoma                                                                                                    |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 11/60 (18%)  11/60 (18%)  10/60 (17%)   4/60 (7%)  |  4/60 (7%)    8/59 (14%)   7/60 (12%)   5/60 (8%)  |
|ADJUSTED (b)           |  24.2%        22.7%        19.4%         8.6%      |   9.8%        20.1%        18.2%        12.9%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    1/10 (10%)   0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  8/42 (19%)   5/42 (12%)   8/49 (16%)   3/45 (7%)  |  3/40 (8%)    7/38 (18%)   5/36 (14%)   3/35 (9%)  |
|FIRST INCIDENCE (DAYS) |   620          489          456 (I)      638       |   724          521          661          551       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.026N*    P=0.577      P=0.374N     P=0.041N*  |  P=0.466      P=0.159      P=0.213      P=0.426    |
|INCIDENTAL TUMOR       |  P=0.059N     P=0.517N     P=0.509      P=0.034N*  |  P=0.499      P=0.163      P=0.363      P=0.584    |
|LOGISTIC REGRESSION    |  P=0.056N     P=0.591      P=0.495      P=0.043N*  |  P=0.519      P=0.182      P=0.238      P=0.473    |
|COCHRAN-ARMITAGE       |  P=0.033N*                                         |  P=0.553N                                          |
|FISHER EXACT           |               P=0.593N     P=0.500N     P=0.048N*  |               P=0.173      P=0.264      P=0.500    |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE   5
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Liver                                                                                                                            |
|     Hepatocellular Carcinoma or Hepatocellular Adenoma                                                                          |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 25/60 (42%)  32/60 (53%)  31/60 (52%)  18/60 (30%) | 23/60 (38%)  24/59 (41%)  25/60 (42%)  15/60 (25%) |
|ADJUSTED (b)           |  55.4%        63.6%        57.1%        36.9%      |  51.5%        59.5%        63.7%        38.5%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    2/10 (20%)   4/10 (40%)   2/10 (20%) |  3/9 (33%)    1/9 (11%)    1/10 (10%)   1/10 (10%) |
|TERMINAL (d)           | 22/42 (52%)  24/42 (57%)  26/49 (53%)  15/45 (33%) | 19/40 (48%)  22/38 (58%)  22/36 (61%)  12/35 (34%) |
|FIRST INCIDENCE (DAYS) |   620          456 (I)      456 (I)      456 (I)   |   457 (I)      457 (I)      457 (I)      457 (I)   |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.024N*    P=0.139      P=0.416      P=0.081N   |  P=0.122N     P=0.415      P=0.271      P=0.157N   |
|INCIDENTAL TUMOR       |  P=0.047N*    P=0.159      P=0.196      P=0.076N   |  P=0.108N     P=0.421      P=0.374      P=0.106N   |
|LOGISTIC REGRESSION    |  P=0.040N*    P=0.105      P=0.212      P=0.104N   |  P=0.071N     P=0.518      P=0.409      P=0.097N   |
|COCHRAN-ARMITAGE       |  P=0.052N                                          |  P=0.056N                                          |
|FISHER EXACT           |               P=0.136      P=0.180      P=0.127N   |               P=0.470      P=0.426      P=0.085N   |
|=================================================================================================================================|
|                                                                                                                                 |
|Liver                                                                                                                            |
|     Hepatocellular Carcinoma, Hepatocellular Adenoma, or Hepatoblastoma                                                         |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 25/60 (42%)  32/60 (53%)  31/60 (52%)  18/60 (30%) | 23/60 (38%)  24/59 (41%)  25/60 (42%)  15/60 (25%) |
|ADJUSTED (b)           |  55.4%        63.6%        57.1%        36.9%      |  51.5%        59.5%        63.7%        38.5%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    2/10 (20%)   4/10 (40%)   2/10 (20%) |  3/9 (33%)    1/9 (11%)    1/10 (10%)   1/10 (10%) |
|TERMINAL (d)           | 22/42 (52%)  24/42 (57%)  26/49 (53%)  15/45 (33%) | 19/40 (48%)  22/38 (58%)  22/36 (61%)  12/35 (34%) |
|FIRST INCIDENCE (DAYS) |   620          456 (I)      456 (I)      456 (I)   |   457 (I)      457 (I)      457 (I)      457 (I)   |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.024N*    P=0.139      P=0.416      P=0.081N   |  P=0.122N     P=0.415      P=0.271      P=0.157N   |
|INCIDENTAL TUMOR       |  P=0.047N*    P=0.159      P=0.196      P=0.076N   |  P=0.108N     P=0.421      P=0.374      P=0.106N   |
|LOGISTIC REGRESSION    |  P=0.040N*    P=0.105      P=0.212      P=0.104N   |  P=0.071N     P=0.518      P=0.409      P=0.097N   |
|COCHRAN-ARMITAGE       |  P=0.052N                                          |  P=0.056N                                          |
|FISHER EXACT           |               P=0.136      P=0.180      P=0.127N   |               P=0.470      P=0.426      P=0.085N   |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE   6
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Lung                                                                                                                             |
|     Alveolar/Bronchiolar Adenoma                                                                                                |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  7/60 (12%)   8/60 (13%)   9/60 (15%)   3/60 (5%)  |  2/60 (3%)    3/59 (5%)    1/60 (2%)    3/60 (5%)  |
|ADJUSTED (b)           |  15.1%        18.1%        17.7%         6.7%      |   5.0%         7.6%         2.8%         7.8%      |
|INTERIM SACRIFICE 1 (c)|  1/10 (10%)   1/10 (10%)   1/10 (10%)   0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  4/42 (10%)   7/42 (17%)   8/49 (16%)   3/45 (7%)  |  2/40 (5%)    2/38 (5%)    1/36 (3%)    2/35 (6%)  |
|FIRST INCIDENCE (DAYS) |   456 (I)      456 (I)      456 (I)      729 (T)   |   729 (T)      718          729 (T)      597       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.097N     P=0.497      P=0.504      P=0.142N   |  P=0.422      P=0.479      P=0.537N     P=0.452    |
|INCIDENTAL TUMOR       |  P=0.123N     P=0.427      P=0.339      P=0.196N   |  P=0.486      P=0.555      P=0.537N     P=0.488    |
|LOGISTIC REGRESSION    |  P=0.119N     P=0.491      P=0.405      P=0.156N   |  P=0.449      P=0.492      P=0.537N     P=0.482    |
|COCHRAN-ARMITAGE       |  P=0.127N                                          |  P=0.480                                           |
|FISHER EXACT           |               P=0.500      P=0.395      P=0.161N   |               P=0.492      P=0.500N     P=0.500    |
|=================================================================================================================================|
|                                                                                                                                 |
|Lung                                                                                                                             |
|     Alveolar/Bronchiolar Carcinoma                                                                                              |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  3/60 (5%)    2/60 (3%)    1/60 (2%)    0/60 (0%)  |  0/60 (0%)    0/59 (0%)    0/60 (0%)    1/60 (2%)  |
|ADJUSTED (b)           |   7.0%         4.5%         2.0%         0.0%      |   0.0%         0.0%         0.0%         2.6%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    0/10 (0%)    0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  2/42 (5%)    0/42 (0%)    1/49 (2%)    0/45 (0%)  |  0/40 (0%)    0/38 (0%)    0/36 (0%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |   712          661          729 (T)      ---       |   ---          ---          ---          680       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.054N     P=0.504N     P=0.256N     P=0.111N   |  P=0.187        (e)          (e)        P=0.481    |
|INCIDENTAL TUMOR       |  P=0.113N     P=0.692      P=0.390N     P=0.153N   |  P=0.242        (e)          (e)        P=0.669    |
|LOGISTIC REGRESSION    |  P=0.058N     P=0.510N     P=0.276N     P=0.113N   |  P=0.196        (e)          (e)        P=0.496    |
|COCHRAN-ARMITAGE       |  P=0.062N                                          |  P=0.199                                           |
|FISHER EXACT           |               P=0.500N     P=0.309N     P=0.122N   |                 (e)          (e)        P=0.500    |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE   7
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Lung                                                                                                                             |
|     Alveolar/Bronchiolar Carcinoma or Alveolar/Bronchiolar Adenoma                                                              |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  9/60 (15%)  10/60 (17%)  10/60 (17%)   3/60 (5%)  |  2/60 (3%)    3/59 (5%)    1/60 (2%)    4/60 (7%)  |
|ADJUSTED (b)           |  19.5%        21.7%        19.7%         6.7%      |   5.0%         7.6%         2.8%        10.2%      |
|INTERIM SACRIFICE 1 (c)|  1/10 (10%)   1/10 (10%)   1/10 (10%)   0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  6/42 (14%)   7/42 (17%)   9/49 (18%)   3/45 (7%)  |  2/40 (5%)    2/38 (5%)    1/36 (3%)    2/35 (6%)  |
|FIRST INCIDENCE (DAYS) |   456 (I)      456 (I)      456 (I)      729 (T)   |   729 (T)      718          729 (T)      597       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.033N*    P=0.497      P=0.571N     P=0.054N   |  P=0.245      P=0.479      P=0.537N     P=0.293    |
|INCIDENTAL TUMOR       |  P=0.055N     P=0.366      P=0.472      P=0.078N   |  P=0.321      P=0.555      P=0.537N     P=0.389    |
|LOGISTIC REGRESSION    |  P=0.042N*    P=0.487      P=0.520      P=0.060N   |  P=0.268      P=0.492      P=0.537N     P=0.320    |
|COCHRAN-ARMITAGE       |  P=0.048N*                                         |  P=0.295                                           |
|FISHER EXACT           |               P=0.500      P=0.500      P=0.063N   |               P=0.492      P=0.500N     P=0.340    |
|=================================================================================================================================|
|                                                                                                                                 |
|Ovary                                                                                                                            |
|     Cystadenoma                                                                                                                 |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |                                                    |  0/59 (0%)    3/59 (5%)    3/59 (5%)    2/60 (3%)  |
|ADJUSTED (b)           |                                                    |   0.0%         7.9%         8.6%         5.4%      |
|INTERIM SACRIFICE 1 (c)|                                                    |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |                                                    |  0/39 (0%)    3/38 (8%)    3/35 (9%)    1/35 (3%)  |
|FIRST INCIDENCE (DAYS) |                                                    |   ---          729 (T)      729 (T)      692       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |                                                    |  P=0.270      P=0.116      P=0.102      P=0.215    |
|INCIDENTAL TUMOR       |                                                    |  P=0.298      P=0.116      P=0.102      P=0.315    |
|LOGISTIC REGRESSION    |                                                    |  P=0.278      P=0.116      P=0.102      P=0.231    |
|COCHRAN-ARMITAGE       |                                                    |  P=0.320                                           |
|FISHER EXACT           |                                                    |               P=0.122      P=0.122      P=0.252    |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE   8
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Ovary                                                                                                                            |
|     Luteoma                                                                                                                     |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |                                                    |  0/59 (0%)    2/59 (3%)    0/59 (0%)    0/60 (0%)  |
|ADJUSTED (b)           |                                                    |   0.0%         4.3%         0.0%         0.0%      |
|INTERIM SACRIFICE 1 (c)|                                                    |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |                                                    |  0/39 (0%)    1/38 (3%)    0/35 (0%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |                                                    |   ---          450          ---          ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |                                                    |  P=0.416N     P=0.241        (e)          (e)      |
|INCIDENTAL TUMOR       |                                                    |  P=0.674N     P=0.164        (e)          (e)      |
|LOGISTIC REGRESSION    |                                                    |  P=0.381N     P=0.214        (e)          (e)      |
|COCHRAN-ARMITAGE       |                                                    |  P=0.402N                                          |
|FISHER EXACT           |                                                    |               P=0.248        (e)          (e)      |
|=================================================================================================================================|
|                                                                                                                                 |
|Ovary                                                                                                                            |
|     Teratoma Benign                                                                                                             |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |                                                    |  0/59 (0%)    0/59 (0%)    0/59 (0%)    2/60 (3%)  |
|ADJUSTED (b)           |                                                    |   0.0%         0.0%         0.0%         3.3%      |
|INTERIM SACRIFICE 1 (c)|                                                    |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |                                                    |  0/39 (0%)    0/38 (0%)    0/35 (0%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |                                                    |   ---          ---          ---          113       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |                                                    |  P=0.047 *      (e)          (e)        P=0.238    |
|INCIDENTAL TUMOR       |                                                    |  P=0.362        (e)          (e)          (e)      |
|LOGISTIC REGRESSION    |                                                    |  P=0.170        (e)          (e)          (e)      |
|COCHRAN-ARMITAGE       |                                                    |  P=0.048 *                                         |
|FISHER EXACT           |                                                    |                 (e)          (e)        P=0.252    |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE   9
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Pituitary Gland: Pars Distalis or Unspecified Site                                                                               |
|     Adenoma                                                                                                                     |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  0/55 (0%)    0/56 (0%)    1/58 (2%)    0/57 (0%)  |  6/57 (11%)   6/58 (10%)   9/59 (15%)   4/58 (7%)  |
|ADJUSTED (b)           |   0.0%         0.0%         2.1%         0.0%      |  14.4%        14.8%        22.9%        11.0%      |
|INTERIM SACRIFICE 1 (c)|  0/8 (0%)     0/10 (0%)    0/9 (0%)     0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  0/40 (0%)    0/40 (0%)    1/48 (2%)    0/44 (0%)  |  5/40 (13%)   4/38 (11%)   7/36 (19%)   3/35 (9%)  |
|FIRST INCIDENCE (DAYS) |   ---          ---          729 (T)      ---       |   612          697          568          692       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.711        (e)        P=0.536        (e)      |  P=0.441N     P=0.587      P=0.238      P=0.450N   |
|INCIDENTAL TUMOR       |  P=0.711        (e)        P=0.536        (e)      |  P=0.347N     P=0.593N     P=0.266      P=0.381N   |
|LOGISTIC REGRESSION    |  P=0.711        (e)        P=0.536        (e)      |  P=0.397N     P=0.616N     P=0.276      P=0.412N   |
|COCHRAN-ARMITAGE       |  P=0.699                                           |  P=0.335N                                          |
|FISHER EXACT           |                 (e)        P=0.513        (e)      |               P=0.607N     P=0.316      P=0.360N   |
|=================================================================================================================================|
|                                                                                                                                 |
|Skin                                                                                                                             |
|     Fibrosarcoma                                                                                                                |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  0/60 (0%)    0/60 (0%)    0/60 (0%)    0/60 (0%)  |  2/60 (3%)    2/59 (3%)    3/60 (5%)    1/60 (2%)  |
|ADJUSTED (b)           |   0.0%         0.0%         0.0%         0.0%      |   4.1%         5.1%         7.7%         2.7%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    0/10 (0%)    0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  0/42 (0%)    0/42 (0%)    0/49 (0%)    0/45 (0%)  |  1/40 (3%)    1/38 (3%)    2/36 (6%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |   ---          ---          ---          ---       |   369          718          655          701       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |    (e)          (e)          (e)          (e)      |  P=0.453N     P=0.679      P=0.472      P=0.537N   |
|INCIDENTAL TUMOR       |    (e)          (e)          (e)          (e)      |  P=0.457N     P=0.696N     P=0.442      P=0.689N   |
|LOGISTIC REGRESSION    |    (e)          (e)          (e)          (e)      |  P=0.408N     P=0.679      P=0.502      P=0.482N   |
|COCHRAN-ARMITAGE       |    (e)                                             |  P=0.402N                                          |
|FISHER EXACT           |                 (e)          (e)          (e)      |               P=0.684      P=0.500      P=0.500N   |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE  10
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Skin                                                                                                                             |
|     Hemangioma                                                                                                                  |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  0/60 (0%)    0/60 (0%)    0/60 (0%)    0/60 (0%)  |  2/60 (3%)    0/59 (0%)    0/60 (0%)    0/60 (0%)  |
|ADJUSTED (b)           |   0.0%         0.0%         0.0%         0.0%      |   4.7%         0.0%         0.0%         0.0%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    0/10 (0%)    0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  0/42 (0%)    0/42 (0%)    0/49 (0%)    0/45 (0%)  |  1/40 (3%)    0/38 (0%)    0/36 (0%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |   ---          ---          ---          ---       |   622          ---          ---          ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |    (e)          (e)          (e)          (e)      |  P=0.122N     P=0.243N     P=0.246N     P=0.257N   |
|INCIDENTAL TUMOR       |    (e)          (e)          (e)          (e)      |  P=0.103N     P=0.277N     P=0.251N     P=0.209N   |
|LOGISTIC REGRESSION    |    (e)          (e)          (e)          (e)      |  P=0.116N     P=0.239N     P=0.239N     P=0.242N   |
|COCHRAN-ARMITAGE       |    (e)                                             |  P=0.115N                                          |
|FISHER EXACT           |                 (e)          (e)          (e)      |               P=0.252N     P=0.248N     P=0.248N   |
|=================================================================================================================================|
|                                                                                                                                 |
|Spleen                                                                                                                           |
|     Hemangiosarcoma                                                                                                             |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  1/60 (2%)    1/60 (2%)    0/60 (0%)    1/60 (2%)  |  2/60 (3%)    1/59 (2%)    1/60 (2%)    0/59 (0%)  |
|ADJUSTED (b)           |   2.4%         2.4%         0.0%         2.1%      |   5.0%         2.6%         2.8%         0.0%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    0/10 (0%)    0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  1/42 (2%)    1/42 (2%)    0/49 (0%)    0/45 (0%)  |  2/40 (5%)    1/38 (3%)    1/36 (3%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |   729 (T)      729 (T)      ---          701       |   729 (T)      729 (T)      729 (T)      ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.593N     P=0.762      P=0.469N     P=0.743N   |  P=0.176N     P=0.518N     P=0.537N     P=0.268N   |
|INCIDENTAL TUMOR       |  P=0.635      P=0.762      P=0.469N     P=0.695    |  P=0.176N     P=0.518N     P=0.537N     P=0.268N   |
|LOGISTIC REGRESSION    |  P=0.604N     P=0.762      P=0.469N     P=0.756N   |  P=0.176N     P=0.518N     P=0.537N     P=0.268N   |
|COCHRAN-ARMITAGE       |  P=0.616N                                          |  P=0.155N                                          |
|FISHER EXACT           |               P=0.752N     P=0.500N     P=0.752N   |               P=0.506N     P=0.500N     P=0.252N   |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE  11
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Stomach, Forestomach                                                                                                             |
|     Squamous Cell Papilloma                                                                                                     |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  1/60 (2%)    0/60 (0%)    1/60 (2%)    0/60 (0%)  |  2/60 (3%)    0/59 (0%)    0/60 (0%)    0/60 (0%)  |
|ADJUSTED (b)           |   2.3%         0.0%         2.0%         0.0%      |   5.0%         0.0%         0.0%         0.0%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    0/10 (0%)    0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  0/42 (0%)    0/42 (0%)    1/49 (2%)    0/45 (0%)  |  2/40 (5%)    0/38 (0%)    0/36 (0%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |   690          ---          729 (T)      ---       |   729 (T)      ---          ---          ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.387N     P=0.505N     P=0.731N     P=0.487N   |  P=0.128N     P=0.250N     P=0.262N     P=0.268N   |
|INCIDENTAL TUMOR       |  P=0.481N     P=0.638N     P=0.617      P=0.638N   |  P=0.128N     P=0.250N     P=0.262N     P=0.268N   |
|LOGISTIC REGRESSION    |  P=0.398N     P=0.502N     P=0.754N     P=0.498N   |  P=0.128N     P=0.250N     P=0.262N     P=0.268N   |
|COCHRAN-ARMITAGE       |  P=0.405N                                          |  P=0.115N                                          |
|FISHER EXACT           |               P=0.500N     P=0.752N     P=0.500N   |               P=0.252N     P=0.248N     P=0.248N   |
|=================================================================================================================================|
|                                                                                                                                 |
|Thyroid Gland: Follicular Cell                                                                                                   |
|     Adenoma                                                                                                                     |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |                                                    |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  0/60 (0%)    0/60 (0%)    1/60 (2%)    0/60 (0%)  |  0/60 (0%)    1/59 (2%)    2/59 (3%)    1/60 (2%)  |
|ADJUSTED (b)           |   0.0%         0.0%         2.0%         0.0%      |   0.0%         2.6%         5.6%         2.9%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    0/10 (0%)    0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  0/42 (0%)    0/42 (0%)    1/49 (2%)    0/45 (0%)  |  0/40 (0%)    1/38 (3%)    2/36 (6%)    1/35 (3%)  |
|FIRST INCIDENCE (DAYS) |   ---          ---          729 (T)      ---       |   ---          729 (T)      729 (T)      729 (T)   |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.707        (e)        P=0.531        (e)      |  P=0.329      P=0.490      P=0.215      P=0.473    |
|INCIDENTAL TUMOR       |  P=0.707        (e)        P=0.531        (e)      |  P=0.329      P=0.490      P=0.215      P=0.473    |
|LOGISTIC REGRESSION    |  P=0.707        (e)        P=0.531        (e)      |  P=0.329      P=0.490      P=0.215      P=0.473    |
|COCHRAN-ARMITAGE       |  P=0.694                                           |  P=0.368                                           |
|FISHER EXACT           |                 (e)        P=0.500        (e)      |               P=0.496      P=0.244      P=0.500    |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE  12
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|Uterus                                                                                                                           |
|     Polyp Stromal                                                                                                               |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |                                                    |  2/60 (3%)    0/59 (0%)    1/60 (2%)    0/60 (0%)  |
|ADJUSTED (b)           |                                                    |   5.0%         0.0%         2.8%         0.0%      |
|INTERIM SACRIFICE 1 (c)|                                                    |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |                                                    |  2/40 (5%)    0/38 (0%)    1/36 (3%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |                                                    |   729 (T)      ---          729 (T)      ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |                                                    |  P=0.211N     P=0.250N     P=0.537N     P=0.268N   |
|INCIDENTAL TUMOR       |                                                    |  P=0.211N     P=0.250N     P=0.537N     P=0.268N   |
|LOGISTIC REGRESSION    |                                                    |  P=0.211N     P=0.250N     P=0.537N     P=0.268N   |
|COCHRAN-ARMITAGE       |                                                    |  P=0.188N                                          |
|FISHER EXACT           |                                                    |               P=0.252N     P=0.500N     P=0.248N   |
|=================================================================================================================================|
|                                                                                                                                 |
|Uterus                                                                                                                           |
|     Sarcoma Stromal or Polyp Stromal                                                                                            |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |                                                    |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |                                                    |  2/60 (3%)    0/59 (0%)    2/60 (3%)    0/60 (0%)  |
|ADJUSTED (b)           |                                                    |   5.0%         0.0%         5.3%         0.0%      |
|INTERIM SACRIFICE 1 (c)|                                                    |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |                                                    |  2/40 (5%)    0/38 (0%)    1/36 (3%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |                                                    |   729 (T)      ---          701          ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |                                                    |  P=0.280N     P=0.250N     P=0.656      P=0.268N   |
|INCIDENTAL TUMOR       |                                                    |  P=0.236N     P=0.250N     P=0.643N     P=0.268N   |
|LOGISTIC REGRESSION    |                                                    |  P=0.267N     P=0.250N     P=0.680      P=0.268N   |
|COCHRAN-ARMITAGE       |                                                    |  P=0.247N                                          |
|FISHER EXACT           |                                                    |               P=0.252N     P=0.691N     P=0.248N   |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE  13
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Hemangioma                                                                                                                  |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  1/60 (2%)    1/60 (2%)    0/60 (0%)    0/60 (0%)  |  2/60 (3%)    0/59 (0%)    0/60 (0%)    0/60 (0%)  |
|ADJUSTED (b)           |   2.4%         2.2%         0.0%         0.0%      |   4.7%         0.0%         0.0%         0.0%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    0/10 (0%)    0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  1/42 (2%)    0/42 (0%)    0/49 (0%)    0/45 (0%)  |  1/40 (3%)    0/38 (0%)    0/36 (0%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |   729 (T)      661          ---          ---       |   622          ---          ---          ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.224N     P=0.758      P=0.469N     P=0.486N   |  P=0.122N     P=0.243N     P=0.246N     P=0.257N   |
|INCIDENTAL TUMOR       |  P=0.305N     P=0.686      P=0.469N     P=0.486N   |  P=0.103N     P=0.277N     P=0.251N     P=0.209N   |
|LOGISTIC REGRESSION    |  P=0.233N     P=0.759      P=0.469N     P=0.486N   |  P=0.116N     P=0.239N     P=0.239N     P=0.242N   |
|COCHRAN-ARMITAGE       |  P=0.236N                                          |  P=0.115N                                          |
|FISHER EXACT           |               P=0.752N     P=0.500N     P=0.500N   |               P=0.252N     P=0.248N     P=0.248N   |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Hemangiosarcoma                                                                                                             |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  1/60 (2%)    1/60 (2%)    0/60 (0%)    2/60 (3%)  |  2/60 (3%)    2/59 (3%)    1/60 (2%)    0/60 (0%)  |
|ADJUSTED (b)           |   2.4%         2.4%         0.0%         4.3%      |   5.0%         5.3%         2.8%         0.0%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    0/10 (0%)    0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  1/42 (2%)    1/42 (2%)    0/49 (0%)    1/45 (2%)  |  2/40 (5%)    2/38 (5%)    1/36 (3%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |   729 (T)      729 (T)      ---          701       |   729 (T)      729 (T)      729 (T)      ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.392      P=0.762      P=0.469N     P=0.526    |  P=0.148N     P=0.676      P=0.537N     P=0.268N   |
|INCIDENTAL TUMOR       |  P=0.332      P=0.762      P=0.469N     P=0.438    |  P=0.148N     P=0.676      P=0.537N     P=0.268N   |
|LOGISTIC REGRESSION    |  P=0.382      P=0.762      P=0.469N     P=0.512    |  P=0.148N     P=0.676      P=0.537N     P=0.268N   |
|COCHRAN-ARMITAGE       |  P=0.367                                           |  P=0.125N                                          |
|FISHER EXACT           |               P=0.752N     P=0.500N     P=0.500    |               P=0.684      P=0.500N     P=0.248N   |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE  14
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Hemangiosarcoma or Hemangioma                                                                                               |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  2/60 (3%)    2/60 (3%)    0/60 (0%)    2/60 (3%)  |  4/60 (7%)    2/59 (3%)    1/60 (2%)    0/60 (0%)  |
|ADJUSTED (b)           |   4.8%         4.6%         0.0%         4.3%      |   9.6%         5.3%         2.8%         0.0%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    0/10 (0%)    0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  2/42 (5%)    1/42 (2%)    0/49 (0%)    1/45 (2%)  |  3/40 (8%)    2/38 (5%)    1/36 (3%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |   729 (T)      661          ---          701       |   622          729 (T)      729 (T)      ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.524N     P=0.691      P=0.205N     P=0.666N   |  P=0.038N*    P=0.356N     P=0.205N     P=0.079N   |
|INCIDENTAL TUMOR       |  P=0.588      P=0.634      P=0.205N     P=0.653    |  P=0.033N*    P=0.380N     P=0.208N     P=0.064N   |
|LOGISTIC REGRESSION    |  P=0.542N     P=0.686      P=0.205N     P=0.682N   |  P=0.033N*    P=0.334N     P=0.184N     P=0.068N   |
|COCHRAN-ARMITAGE       |  P=0.556N                                          |  P=0.030N*                                         |
|FISHER EXACT           |               P=0.691N     P=0.248N     P=0.691N   |               P=0.348N     P=0.182N     P=0.059N   |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Histiocytic Sarcoma                                                                                                         |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  0/60 (0%)    0/60 (0%)    0/60 (0%)    0/60 (0%)  |  1/60 (2%)    0/59 (0%)    4/60 (7%)    0/60 (0%)  |
|ADJUSTED (b)           |   0.0%         0.0%         0.0%         0.0%      |   2.3%         0.0%         9.0%         0.0%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    0/10 (0%)    0/10 (0%)  |  0/9 (0%)     0/9 (0%)     1/10 (10%)   0/10 (0%)  |
|TERMINAL (d)           |  0/42 (0%)    0/42 (0%)    0/49 (0%)    0/45 (0%)  |  0/40 (0%)    0/38 (0%)    1/36 (3%)    0/35 (0%)  |
|FIRST INCIDENCE (DAYS) |   ---          ---          ---          ---       |   705          ---          457 (I)      ---       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |    (e)          (e)          (e)          (e)      |  P=0.558N     P=0.509N     P=0.172      P=0.541N   |
|INCIDENTAL TUMOR       |    (e)          (e)          (e)          (e)      |  P=0.423N     P=0.331N     P=0.302      P=0.331N   |
|LOGISTIC REGRESSION    |    (e)          (e)          (e)          (e)      |  P=0.524N     P=0.499N     P=0.181      P=0.509N   |
|COCHRAN-ARMITAGE       |    (e)                                             |  P=0.528N                                          |
|FISHER EXACT           |                 (e)          (e)          (e)      |               P=0.504N     P=0.182      P=0.500N   |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE  15
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Malignant Lymphoma: Histiocytic, Lymphocytic, Mixed, NOS, or Undifferentiated                                               |
|     Cell Type                                                                                                                   |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            |  2/60 (3%)    2/60 (3%)    3/60 (5%)    6/60 (10%) | 13/60 (22%)   7/59 (12%)  11/60 (18%)   8/60 (13%) |
|ADJUSTED (b)           |   4.8%         4.8%         5.7%        12.7%      |  31.7%        16.7%        26.6%        19.7%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    1/10 (10%)   0/10 (0%)  |  0/9 (0%)     0/9 (0%)     0/10 (0%)    0/10 (0%)  |
|TERMINAL (d)           |  2/42 (5%)    2/42 (5%)    2/49 (4%)    4/45 (9%)  | 12/40 (30%)   4/38 (11%)   7/36 (19%)   4/35 (11%) |
|FIRST INCIDENCE (DAYS) |   729 (T)      729 (T)      456 (I)      670       |   712          599          497          582       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.070      P=0.695      P=0.556      P=0.162    |  P=0.333N     P=0.133N     P=0.509N     P=0.257N   |
|INCIDENTAL TUMOR       |  P=0.049 *    P=0.695      P=0.556      P=0.099    |  P=0.217N     P=0.078N     P=0.428N     P=0.131N   |
|LOGISTIC REGRESSION    |  P=0.060      P=0.695      P=0.499      P=0.146    |  P=0.184N     P=0.102N     P=0.424N     P=0.196N   |
|COCHRAN-ARMITAGE       |  P=0.056                                           |  P=0.226N                                          |
|FISHER EXACT           |               P=0.691N     P=0.500      P=0.136    |               P=0.118N     P=0.410N     P=0.168N   |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Benign Tumors                                                                                                               |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 31/60 (52%)  32/60 (53%)  38/60 (63%)  20/60 (33%) | 30/60 (50%)  31/59 (53%)  25/60 (42%)  25/60 (42%) |
|ADJUSTED (b)           |  67.1%        67.5%        70.1%        41.2%      |  66.1%        70.1%        61.8%        57.8%      |
|INTERIM SACRIFICE 1 (c)|  1/10 (10%)   3/10 (30%)   5/10 (50%)   2/10 (20%) |  3/9 (33%)    1/9 (11%)    1/10 (10%)   2/10 (20%) |
|TERMINAL (d)           | 27/42 (64%)  27/42 (64%)  33/49 (67%)  17/45 (38%) | 25/40 (63%)  25/38 (66%)  21/36 (58%)  18/35 (51%) |
|FIRST INCIDENCE (DAYS) |   456 (I)      456 (I)      456 (I)      456 (I)   |   457 (I)      450          457 (I)      113       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.006N**   P=0.494      P=0.405      P=0.015N*  |  P=0.305N     P=0.402      P=0.363N     P=0.405N   |
|INCIDENTAL TUMOR       |  P=0.012N*    P=0.487      P=0.226      P=0.033N*  |  P=0.131N     P=0.477      P=0.296N     P=0.183N   |
|LOGISTIC REGRESSION    |  P=0.009N**   P=0.447      P=0.157      P=0.023N*  |  P=0.141N     P=0.528      P=0.224N     P=0.218N   |
|COCHRAN-ARMITAGE       |  P=0.024N*                                         |  P=0.135N                                          |
|FISHER EXACT           |               P=0.500      P=0.134      P=0.032N*  |               P=0.463      P=0.232N     P=0.232N   |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE  16
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 TERMINAL SACRIFICE AT 105 WEEKS
|=================================================================================================================================|
|                       |                                                    |                                                    |
|                       |                       MALES                        |                      FEMALES                       |
|                       |                                                    |                                                    |
|DOSE                   |   0 PPM        250 PPM      500  PPM     1000 PPM  |   0 PPM        250 PPM      500 PPM      1000 PPM  |
|                       |                                                    |                                                    |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Malignant Tumors                                                                                                            |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 17/60 (28%)  15/60 (25%)  16/60 (27%)  11/60 (18%) | 23/60 (38%)  22/59 (37%)  24/60 (40%)  18/60 (30%) |
|ADJUSTED (b)           |  36.1%        30.5%        30.4%        22.4%      |  50.8%        48.2%        50.7%        39.3%      |
|INTERIM SACRIFICE 1 (c)|  0/10 (0%)    0/10 (0%)    2/10 (20%)   0/10 (0%)  |  0/9 (0%)     0/9 (0%)     1/10 (10%)   1/10 (10%) |
|TERMINAL (d)           | 12/42 (29%)   8/42 (19%)  13/49 (27%)   7/45 (16%) | 18/40 (45%)  15/38 (39%)  13/36 (36%)   8/35 (23%) |
|FIRST INCIDENCE (DAYS) |   620          489          456 (I)      638       |   369          450          457 (I)      457 (I)   |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.095N     P=0.438N     P=0.337N     P=0.116N   |  P=0.370N     P=0.565N     P=0.370      P=0.380N   |
|INCIDENTAL TUMOR       |  P=0.235N     P=0.423N     P=0.444      P=0.170N   |  P=0.192N     P=0.490N     P=0.519N     P=0.109N   |
|LOGISTIC REGRESSION    |  P=0.201N     P=0.442N     P=0.475      P=0.218N   |  P=0.146N     P=0.484N     P=0.492      P=0.248N   |
|COCHRAN-ARMITAGE       |  P=0.127N                                          |  P=0.194N                                          |
|FISHER EXACT           |               P=0.418N     P=0.500N     P=0.140N   |               P=0.529N     P=0.500      P=0.221N   |
|=================================================================================================================================|
|                                                                                                                                 |
|All Organs                                                                                                                       |
|     Malignant and Benign Tumors                                                                                                 |
|                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|
|TUMOR RATES            |    #            #            #            #        |    #            #            #            #        |
|-----------            |                                                    |                                                    |
|OVERALL (a)            | 39/60 (65%)  41/60 (68%)  45/60 (75%)  27/60 (45%) | 41/60 (68%)  38/59 (64%)  40/60 (67%)  41/60 (68%) |
|ADJUSTED (b)           |  79.5%        78.6%        80.2%        52.7%      |  83.4%        80.6%        79.8%        78.5%      |
|INTERIM SACRIFICE 1 (c)|  1/10 (10%)   3/10 (30%)   6/10 (60%)   2/10 (20%) |  3/9 (33%)    1/9 (11%)    2/10 (20%)   3/10 (30%) |
|TERMINAL (d)           | 32/42 (76%)  31/42 (74%)  38/49 (78%)  21/45 (47%) | 32/40 (80%)  29/38 (76%)  26/36 (72%)  24/35 (69%) |
|FIRST INCIDENCE (DAYS) |   456 (I)      456 (I)      456 (I)      456 (I)   |   369          450          457 (I)      113       |
|-----------------------|                                                    |                                                    |
|STATISTICAL TESTS (f)  |                                                    |                                                    |
|-----------------------|                                                    |                                                    |
|LIFE TABLE             |  P=0.003N**   P=0.416      P=0.546      P=0.012N*  |  P=0.214      P=0.475N     P=0.427      P=0.310    |
|INCIDENTAL TUMOR       |  P=0.011N*    P=0.429      P=0.134      P=0.023N*  |  P=0.505      P=0.362N     P=0.412N     P=0.332N   |
|LOGISTIC REGRESSION    |  P=0.005N**   P=0.361      P=0.186      P=0.013N*  |  P=0.415      P=0.297N     P=0.493N     P=0.577    |
|COCHRAN-ARMITAGE       |  P=0.009N**                                        |  P=0.482                                           |
|FISHER EXACT           |               P=0.423      P=0.160      P=0.022N*  |               P=0.398N     P=0.500N     P=0.578N   |
|=================================================================================================================================|
         DATE: 11/09/95                     EXPERIMENT: 05165 TEST: 02                                                 PAGE  17
                      STATISTICAL ANALYSIS OF PRIMARY TUMORS IN MICE(B6C3F1) -- 4,4 THIOBIS-(6-T-BUTYL-M-CRESOL)
                                                 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.
 (c)  Observed incidence at interim kill.
          Male interim sacrifices(days):   456
          Female interim sacrifices(days): 457
 (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).