Preservation of pelvic autonomic nerves to retain genitourinary function without compromise of oncologic clearance of tumor has been extensively studied in rectal cancer surgery. However, there is still not much information about preservation of autonomic nerves after colectomy for right and left colon cancer. Because the abdominal deep-seated neural structures, such as abdominal plexus (superior hypogastric plexus), neurovascular bundles of SMA, SMV and IMV were within the boundary of dissection, traditional colectomy for right and left colon cancer extended simultaneous dissection of the lateral bundles and entire circle of the neural plexuses surrounding the SMV and IMV. However, a severe and persistent diarrhea, enterospasm, or enteroparalysis developed in almost some patients. It is therefore opinion that during the colectomy for right and left colon cancer, preservation of autonomic nerves may be a priority-that is, autonomic nerve preservation is appropriate unless there are oncologic reasons for the resection of nerves. Therefore, the investigators conducted the present study to test the feasibility of laparoscopic approach in performing the total abdominal autonomic nerve preservation during the standard oncologic resection of right/left colon cancer. The investigators hypothesized that given a well-illuminated magnified view by laparoscopy, the autonomic nerves can be well protected from inadvertent surgical damage. Therefore, the investigators aimed to compare the efficacy and safety of the total abdominal autonomic nerve preservation (TNP) versus traditional CME of right/left colon cancer.