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Study of primary leiomyosarcoma induced by MNNG in BALB/C nude mice.

It has been well known that MNNG is one of the strong and multipotential carcinogens that have been frequently reported inducing malignant peptic tumors. We have successfully induced rat and dog gastric adenocarcinomas, squamous cell carcinomas of rat forestomach and gastric leiomyosarcoma of rats since 1979. In order to replicate the model of human gastric carcinoma in rats, large doses of MNNG was administered to BALB/C nude mice, to which human embryonic mucosa had been transplanted. During the experiment, the primary leiomyosarcoma (PLS) of the nude mouse was unexpectedly obtained.