a number of different compounds , including phenobarbital , hypolipidemic drugs such as clofibrate and nafenopin , the sex steroids progesterone , cyproterone acetate , estradiol and mestranol , chlorinated hydrocarbons such as ddt , hexachlorocyclohexane , and tcdd and the antioxidant butylhydroxytoluene , appears to promote the development of liver tumors from previously induced initiated cells .
C0020247
chlorinated hydrocarbons
C0005038
hexachlorocyclohexane