METHODS: Twenty-eight colorectal cancer patients were grouped into 4 groups according to their
nutrition regimens randomly and were given immunonutrition (IMN), standard enteral (SE), total
parental nutrition (TPN), and normal nutrition (NN) regimens, all of which contained the same
calorie-nitrogen content within a 7-day preoperative period. All patients had an endoscopic biopsy
before and after the regimen, and the lymphocyte population infiltrating mucosal parts of the resected
tumor tissue were evaluated. Immunohistochemical analysis of the tissue specimens was performed by
staining with antihuman CD4, CD8, CD16, and CD56 antibodies.