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It was shown that of four syngeneic, murine tumors investigated, only those that evoked the generation of a state of concomitant anti-tumor immunity were susceptible to endotoxin-induced regression. Moreover, the temporal relationship between the generation of concomitant immunity and the onset of susceptibility to endotoxin-induced regression points to the likely possibility that tumor regression depends on the preceding acquisition of the specifically-sensitized, effector T cells that express concomitant immunity. It is suggested that endotoxin-induced hemorrhagic necrosis which invariably precedes tumor regression serves to create conditions inside the tumor that are conducive to the entry and the functioning of effector T cells. It is also suggested that tumor necrosis factor causes hemorrhagic necrosis rather than tumor regression.

The immunological basis of endotoxin-induced tumor regression. Requirement for a pre-existing state of concomitant anti-tumor immunity.