Carcinogenesis in rat esophagus by intraperitoneal injection of different doses of methyl-n-amylnitrosamine.
The carcinogenicity of methyl-n-amylnitrosamine in MRC-Wistar rats was determined after i.p. injection at a variety of dose schedules. After 6 weekly methyl-n-amylnitrosamine injections of 25 mg/kg or 12 weekly injections of either 12.5 or 25 mg/kg, the incidence of esophageal squamous cell papillomas was 85 to 100% and that of esophageal squamous cell carcinomas was 40 to 65%. With 12 injections, the mean survival time was 25 to 31 weeks. Treatment with 1 or 2 doses of 50 mg/kg produced a lesser incidence (less than 20%) of esophageal tumors, with a longer survival time of 67 to 77 weeks. One 85-mg/kg injection caused esophageal carcinomas in 5 of 7 rats. The treated groups also had squamous cell papillomas and carcinomas in the nasal cavity (up to 50% incidence) and trachea (up to 30% incidence). Hence, a 6- or 12-week treatment schedule was adequate for inducing esophageal tumors and could be used for studies on agents modifying esophageal tumor induction by methyl-n-amylnitrosamine.[1]References
- Carcinogenesis in rat esophagus by intraperitoneal injection of different doses of methyl-n-amylnitrosamine. Bulay, O., Mirvish, S.S. Cancer Res. (1979) [Pubmed]
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