Kaplan-Meier estimation of percent tumor bearing animals throughout 25 wk of promotion with TPA (6.5 nmol/200 μl), twice weekly starting two weeks post initiation. Initiation doses were 200 μl toluene (Ctrl), 400 nmol (100 μg) BaP, 4 nmol (1.2 μg) DBC, 1 mg DPE (mix 1), 1 mg DPE + 1 mg CTE (mix 2), and 1 mg DPE + 1 mg CTE + 2 mg CSC (mix 3). Individuals that died tumor free before the end of 25 weeks and those that were tumor free at the end of 25 weeks were censored and are indicated by an *.