Yoshida ascites sarcoma grown in mice.

Xenogeneic Yoshida ascites sarcoma grows well in the abdominal cavity of thymectomized, irradiated mice reconstituted with syngeneic bone marrow. These animals displayed a 100-percent mortality. In control sham-thymectomized, irradiated mice reconstituted with syngeneic bone marrow mortality was significantly lower. The tumor growth could be neutralized by means of single intravenous injection of nonimmune spleen cells inoculated at the same time as the tumor. Tumor cells grown in mice killed normal rats and were rejected by normal mice.