title: Skin tumor initiating ability of benzo(a)pyrene 4,5- 7,5- and 7,8-diol-9,10-epoxides and 7,8-diol.
abstract: The skin tumor initiating abilities of both K-region and non-K-region epoxides of benzo(a)pyrene(BP) were determined in mice using a two-stage system of tumorigenesis. BP-4,5-epoxide and BP-7,8-dihydrodiol-9,10-epoxide (anti) were found to be weak tumor initiators whereas BP-7,8-epoxide had about a third of the activity as the parent hydrocarbon, BP. However, the 7,8-dihydrodiol of BP was found to be approximately as potent as BP suggesting that it may be a proximate carcinogen.
mesh_terms: D000818:Animals; D001580:Benzopyrenes / Q000378:metabolism / Q000633:toxicity*; D002273:Carcinogens; D004852:Epoxy Compounds / Q000633:toxicity; D005260:Female; D051379:Mice; D009374:Neoplasms, Experimental / Q000139:chemically induced; D012878:Skin Neoplasms / Q000139:chemically induced*
chemical_list: D001580:Benzopyrenes; D002273:Carcinogens; D004852:Epoxy Compounds