Comparison of therapeutic effect by number of access ports in laparoscopic surgery for colorectal cancer: Single-incision vs. Multi-port laparoscopic colectomy study (SIMPL study) (randomized phase II comparison study)

Interventions: 1)Single incision laparoscopic surgery: All trocars passes a special platform via a single wound. Addition of one trocar because of transection of colon or insertion of drainage tube is allowed. It is defined when there are addition of two trocars or more as the conversion into the multi-port surgery. The application of Colon lifting technique of the securing purpose of counter traction is allowed. 2) Multiport laparoscopic surgery: The ports are set up up to 4-5 places at the time of beginning the operation. *When the wound length is 8cm or more, it is defined as the conversion to the open surgery. Primary outcome(s): Occurrence ratio of adverse event within postoperative one month Study Design: Parallel Randomized