Clinical Research Directory

Inclusion Criteria: 1. Primary colon cancers located at the left sided colonic anatomic location, including distal transverse colon, colonic splenic flexure, descending colon, sigm oid descending colonic junction, sigmoid colon and upper rectum that required the mobilization of colonic splenic flexure to facilitate a curative resection and trans anal specimen extraction ; 2. TNM Stage I III adenocarcinomas; 3. Curative and elective surgery; 4. American Society of Anesthesiology (ASA) class I to III patients; 5. Age \>18 years. Exclusion Criteria: 1. Cecal, ascending, the proximal and middle transverse colon cancers; and the middle or lower rectal cancers; 2. Emergency or palliative surgery; 3. Evidence of disseminated disease or adjacent organ invasion; 4. Primary tumor mass \>8 cm in diameter; 5. Morbidly obese patients, that is, body mass index (BMI) ≥40 kg/m 2 ; 6. Previous major surgery of upper abdomen or pelvis