C57BL/6J mice were used both for induction of osteogenic sarcomas by injection of 90Sr and for induction of sarcomas and carcinomas by injection of 9,10-dimethyl-1,2-benzanthracene. The osteogenic sarcomas had a relatively long induction period; they possessed low immunogenicity and failed to activate splenic suppressor cells either in the original tumor-bearing host or in mice bearing transplanted osteogenic sarcomas. In contrast, and in agreement with previous work, 9,10-dimethyl-1,2-benzanthracene-induced tumors had a relatively short induction period; they possessed high immunogenicity and activated splenic suppressor cells in mice bearing transplanted tumors. These results suggest the possibility that the immunogenicity of tumors correlates with the ability of tumors to activate suppressor cells.

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