The Effects of General Anesthetics on Lymphocytes in Patients Undergoing Colorectal Cancer Resection and Mechanism Involved

The body immunity is important to the development of tumor. The immune system is in charge of monitoring and cleaning tumor cells in circulation. Anesthesia may alter the immune response and affect the elimination of tumor cells. The purpose of the trial is to test whether inhalational anesthetic is relevant to tumor metastasis and recurrence of patients undergoing colorectal cancer resection through depression of lymphocytes-mediated immunity.