Low numbers of tumor cells suppress the host immune system.
D000818:Animals; D007109:Immunity; D007156:Immunologic Memory; D007165:Immunosuppression Therapy; D012515:Mast-Cell Sarcoma / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology; D014184:Transplantation, Homologous