Five-Year Prognosis of Complete Mesocolic Excision in Patients with Colon Cancer: A Prospective, Nonrandomized, Double-Blind Controlled Trial.

BACKGROUND: Previous studies on how complete mesocolic excision (CME) affects prognosis indicate fundamental limitations that prevent the procedure from being completely accepted in practice. This study evaluated 5-year survival in colon cancer patients who underwent CME in a strict quality-controlled trial. STUDY DESIGN: A prospective, nonrandomized, double-blind, controlled trial recruited patients who underwent open radical resection for colon cancer between November 2012 and November 2017. Third-party experts evaluated whether patients had undergone mesocolic dissection and/or central ligation by looking at photographs of both surgical field and specimen, and then divided patients into CME and non-CME (NCME) groups. The primary outcome was the 5-year local recurrence-free survival rate. Clinicopathological and follow-up data were recorded. RESULTS: There were 261 patients with a median follow-up time of 57 months assigned to the CME group, and 129 patients with a median follow-up time of 59 months were assigned to the NCME group. The 5-year local recurrence-free survival rate of patients with Union Internationale Contre le Cancer stage I to III cancer did not differ significantly between the groups. For stage I to III cancer and stage III cancer, the absolute risk reduction of 5-year cumulative death and disease progression after CME were 9.1% (95% CI 1% to 17%; p = 0.033) and 16.1% (95% CI 1% to 31%; p = 0.040), respectively. Meanwhile, CME also could reduce 14% 5-year cumulative incidence recurrence for Union Internationale Contre le Cancer stage III cancer compared with NCME (CME, 27.3% vs NCME, 41.3%; p = 0.042) after adjusting for the effect of non-cancer-related death. CONCLUSIONS: CME should be considered as a standard surgical procedure in affected patients. [ABSTRACT FROM AUTHOR]