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Gastric tumors and lung lesions in the rat following the intragastric or intraperitoneal administration of N-(beta-chloroethyl)-N-nitrosourethan.

Summary N -(β-Chloroethyl)- N -nitrosourethan given intragastrically to rats in one or two doses not exceeding 15 mg/kg body weight induced tumors among 12 rats that survived longer than 1 year, one of the esophagus, one of the forestomach, and three of the glandular stomach. When a single dose of N -(β-chloroethyl)- N -nitrosourethan was given i.p. (about 5 mg/kg body weight), there were many early deaths from exudative and proliferative alveolar changes in the lungs, and none of the rats survived longer than 6 months. The possible reasons for the high efficacy of N -(β-chloroethyl)- N -nitrosourethan as a carcinogen are discussed.