title: [Immunologic inhibitory factor in nasopharyngeal cancer (NPC)--effect of the NPC immunologic inhibitory factor on natural killer (NK) cell function].
mesh_terms: D006801:Humans; D007166:Immunosuppressive Agents / Q000276:immunology; D066298:In Vitro Techniques; D007694:Killer Cells, Natural / Q000276:immunology*; D009303:Nasopharyngeal Neoplasms / Q000276:immunology*; D014066:Palatine Tonsil / Q000276:immunology; D014020:Tissue Extracts / Q000276:immunology
chemical_list: D007166:Immunosuppressive Agents; D014020:Tissue Extracts