title: Induction of local epidermal papillomas and carcinoma by selected nitrosamines.
abstract: Weekly cutaneous application of N-nitrosobis (2-oxopropyl)amine (BOP) at a dose of 2 mg/application to the neck area resulted in the induction of local papillomas and carcinomas in 80% of Syrian hamsters as early as 19 weeks post-treatment. In addition, a few tumors of internal organs (predominantly in the liver) were also found. N-Nitroso(2-hydroxypropyl) (2-oxopropyl)amine (HPOP), a common metabolite of BOP and BHP, was also found to be an epidermal carcinogen at a dose of 3.8 mg/application. N-Nitrosobis(2-hydroxypropyl)amine (BHP), however, failed to induce any epidermal lesions, when applied similarly at a much higher dose level (%) mg/animal/week). In contrast to BOP and HPOP, BHP induced a high incidence of tumors in internal organs, especially pancreatic cancer, which was the only induced tumor in 5 animals. Skin absorption studies demonstrated that BHP, but not BOP is rapidly absorbed and was detectable in the blood in concentrations of up to 5.5 mug/ml as early as 15 min after carcinogen administration. The possible reasons for the differing effects of BHP and BOP upon hamster skin are discussed.
mesh_terms: D000230:Adenocarcinoma / Q000139:chemically induced; D002759:Adenoma, Bile Duct / Q000139:chemically induced; D000818:Animals; D001650:Bile Duct Neoplasms / Q000139:chemically induced; D002277:Carcinoma / Q000139:chemically induced*; D006224:Cricetinae; D005260:Female; D006258:Head and Neck Neoplasms / Q000139:chemically induced; D008113:Liver Neoplasms / Q000139:chemically induced; D008647:Mesocricetus; D009602:Nitrosamines / Q000378:metabolism; D009669:Nose Neoplasms / Q000139:chemically induced; D010190:Pancreatic Neoplasms / Q000139:chemically induced; D010212:Papilloma / Q000139:chemically induced*; D012878:Skin Neoplasms / Q000139:chemically induced*
chemical_list: D009602:Nitrosamines; C012457:diisopropanolnitrosamine; C013622:nitrosobis(2-oxopropyl)amine; C013624:N-nitroso(2-hydroxypropyl)(2-oxopropyl)amine