Delay of methylcholanthrene skin carcinogenesis in mice by 1,2,5,6-dibenzofluorene.

Abstract

1. The addition of 1,2,5,6-dibenzofluorene to methylcholanthrene delays skin carcinogenesis in mice. 2. Chrysene, fluorene, and 1,2,7,8-dibenzofluorene have no delaying effect on methylcholanthrene skin carcinogenesis in mice.