A Trial to Establish the Role of Leukocyte Concentration and Tissue Type of Transfused Blood in Immunomodulation of Patients Undergoing Elective Surgery for Colorectal Cancer

INTERVENTION: 1. Arm A: Surgery without transfusion 2. Arm B: Surgery with standard blood transfusion 3. Arm C: Surgery with leucodepleted blood transfusion CONDITION: Colorectal cancer ; Cancer ; Colorectal cancer PRIMARY OUTCOME: Not provided at time of registration SECONDARY OUTCOME: Not provided at time of registration INCLUSION CRITERIA: 1. Patients undergoing elective resection of colorectal carcinoma 2. No transfusion of blood in the 6 months preceding the operation 3. No transfusion of blood prior to the first postoperative sample 4. No concurrent immunosuppressive medication 5. No previous transfusion reaction requiring cessation of transfusion