title: Tumorigenic effect of 4-methylphenylhydrazine hydrochloride in Swiss mice.
abstract: 4-Methylphenylhydrazine hydrochloride was administered as 10 weekly subcutaneous injections of 140 microgram/g body weight and as 7 weekly intragastric instillations of 250 microgram/g body weight in physiological saline to randomly bred Swiss mice. Treatments given subcutaneously resulted in induction of lung tumors in incidences of 36% in females and 44% in males, while intragastric treatment caused a 40% incidence in females. In addition, it gave rise to blood vessel tumors by intragastric route in incidences of 32% in females and 18% in males. In the two physiological saline-treated control groups, the lung tumor incidence (combined) was 20% in females and 21% in males, while the blood vessel tumor incidence (combined) was 7% in females and 6% in males. Histopathologically, the lesions were classified as adenomas and adenocarcinomas of the lungs, and angiomas and angiosarcomas of blood vessels. 4-Methylphenylhydrazine was postulated to be a metabolite of 4-hydroxymethylphenylhydrazine, an ingredient of the commonly eaten mushroom Agaricus bisporus. The implications are discussed with respect to the tumorigenesis data.
mesh_terms: D000818:Animals; D001487:Basidiomycota / Q000032:analysis; D002273:Carcinogens; D005260:Female; D008175:Lung Neoplasms / Q000139:chemically induced*; D008297:Male; D008763:Methylhydrazines / Q000009:adverse effects* / Q000032:analysis; D051379:Mice; D009383:Neoplasms, Vascular Tissue / Q000139:chemically induced*
chemical_list: D002273:Carcinogens; D008763:Methylhydrazines