Metastasizing mammary carcinomas in rats: induction and study of their immunogenicity

Widely metastasizing mammary adenocarcinomas were isolated from methylcholanthrene-fed inbred young adult female W/Fu rats that had been splenectomized or thymectomized, and from those that had been both splenectomized and thymectomized. These tumors are transplantable and maintain their metastasizing capacity. They are either nonimmunogenic or less immunogenic than the nonmetastasizing conventional methylcholathrene-induced mammary tumors, which are highly immunogenic.