[Cellular immunity in an experimental ascites tumor: tumor immunostimulation mediated by splenic lymphocytic cells]

The authors consider three successive phenomena in the experimental Ca H tumor evolution. A first stage of tumor resistance due to cytotoxic cells in the presence of some suppressor cells; a second stage when suppressor activity is predominantly observed, and a final stage of lymphocyte-mediated immunostimulation. Vasodilatation and angiogenesis are probably important during third stage.