[Cytotoxic effect of peritoneal macrophages on an intestinal carcinoma in rats. Demonstration of a new cytotoxicity test].

Macrophages were isolated from the peritoneal cavity of rats treated by BCG. These macrophages were found to be cytotoxic for syngeneic intestinal cancer cells cultivated in vitro. Cytotoxicity was demonstrated by a new quantitative assay using acidic elution of methylene blue staining the residual cells.