6-Aminochrysene (6-Aminochrysene) is an aromatic amine used as a chemotherapeutic agent in the treatment of splenomegaly, myeloid leukemia, and breast cancer. In Vitro: 6-Aminochrysene inhibits the hydroxylation of aniline, 0-demethylation of p-nitroanisole, and N-demethylation of aminopyrine by rat liver microsomes. Pre-treatment of rats with 6-aminochrysene markedly decreases the N-demethylation in vitro but significantly increases the hydroxylation and the 0-demethylation^[1]. In Vivo: 6-Aminochrysene is an inhibitor of the growth of several solid experimental tumours in vivo and has a cancerostatic effect on human breast cancer^[1]. Long term topical skin application of 6-Aminochrysene to mice induces development of benign skin tumors after 3 months and of skin malignancies after 7 months. Female mice respond earlier than males. Induction of skin tumors is more rapid when 6-Aminochrysene is applied ventrally instead of dorsally. Urinary excretion is about twice as high after skin application than after oral administration^[2].