[Preliminary study of the role of natural killer cells in human tumor immunity].
D003110:Colonic Neoplasms / Q000276:immunology*; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology*; D008875:Middle Aged; D009362:Neoplasm Metastasis; D012004:Rectal Neoplasms / Q000276:immunology*; D013274:Stomach Neoplasms / Q000276:immunology*