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Objective: To study expression of membrane receptors ofinterleukin-2 (CD25) on the peripheral blood lymphocytes (PBL) of patients with colorectal cancer and its clinical significance. Methods: CD25 percentages (CD25%) in PBL of 105 colorectal cancer patients before operation and 100 normal individuals were examined by flow cytometer, and the results were clinically and pathologically analyzed. Results: The mean of CD25% in PBL of the normal individuals was 17.24± 5.33, it was significantly lower (p