Comparison of outcomes of complete mesocolic excision with conventional radical resection performed by laparoscopic approach for right colon cancer.

Background: This retrospective study compared the outcomes of laparoscopic complete mesocolic excision (CME) guided by superior mesenteric artery with laparoscopic conventional radical resection (CRR) performed for right-sided colon cancer. Methods: Patients with right-sided colon cancer underwent CME (n=107; January 2011 to December 2015) or CRR (n=60; January 2008 to December 2010). Results: The 2 groups were comparable regarding age, gender, body mass index, maximum tumor diameter, and tumor stage. In the CME group, the distances between the tumor and the high vascular tie (HVT; 12.6 cm), and between the closest bowel wall and HVT (10.4 +/- 0.9 cm) was significantly greater than that of the CRR group (11.5 cm and 9.3 +/- 1.0 cm, respectively; P<0.001). In the CME group, the number of retrieved lymph nodes (23.2) was significantly higher, and the volume of intraoperative bleeding (108.4 mL) was less than that of the CRR (14.0 and 128.7 mL; P<0.001). The length of resected bowel in the 2 groups was similar (25.8 +/- 0.7 cm and 25.5 +/- 2.1 cm; P=0.106), as was the operative time, postoperative hospitalization, time of first bowel movement, and complications. The 3-year recurrence rate of the CME group (8.4%) was significantly lower than that of the CRR (20.0%), the 3-year overall survival was significantly higher (93.5% cf. 85.0%), and the survival rates of T4 stage, N1 stage, pTNM stage II, pTNM stage III and lympho vascular invasion were significantly higher (P<0.05). The 2 groups were similar for survival rates of Tis, T1, T2, T3, N2 stage, pTNM stage I and perineural invasion (P>0.05). Conclusion: CME for right-sided colon cancer guided by superior mesenteric artery has similar short-term outcomes, higher lymph node yield, and higher 3-year overall survival compared with CRR.