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The effect of immunosuppressive (IS) substance obtained from cancerous ascitic fluid on tumor growth and host immunity in plasmacytoma X5563-bearing C3H/He mice is described. IS substance given in three injections, before and after tumor inoculation caused: (a) enhanced tumor growth, (b) marked reduction in survival times, (c) inhibition on Con-A response of spleen cells. Depressed natural killer (NK) activity was observed in normal and tumor-bearing mice treated with IS substance. The data presented here suggest that IS substance suppresses both humoral and cellular immunoresponsiveness and tumor cells evade immune surveillance or immunologically mediated removal.
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