title: The effect of major surgery on T-lymphocyte function in patients with gastrointestinal cancer.
mesh_terms: D000368:Aged; D005260:Female; D005770:Gastrointestinal Neoplasms / Q000276:immunology / Q000601:surgery*; D006801:Humans; D008213:Lymphocyte Activation; D008297:Male; D008875:Middle Aged; D013601:T-Lymphocytes / Q000145:classification / Q000276:immunology*