Open versus laparoscopic lateral lymph node dissection for mid- and low- rectal cancer: a propensity score matching study.

BACKGROUND This study aimed to evaluate the perioperative, pathological and oncological outcomes of open versus laparoscopic total mesorectal excision (TME) plus lateral lymph node dissection (LLND) for mid- and low- rectal cancer using propensity score matching. METHODS Between September 2009 and December 2018, consecutive patients who underwent open or laparoscopic TME plus LLND were collected. Based on the propensity score matching analysis, laparoscopic TME plus LLND was compared with open TME plus LLND for the perioperative, pathological, and oncological outcomes. RESULTS A total of 77 patients were collected. There were 13 patients who underwent open TME plus LLND (open group) and 64 patients who underwent laparoscopic TME plus LLND (laparoscopic group). After propensity score matching, 13 patients in the open group were matched to 39 patients in the laparoscopic group (1:3). The laparoscopic group had a significantly shorter length of incision (5 cm vs. 20 cm, p < 0.01), less intraoperative blood loss (80 mL vs. 100 mL, p = 0.02), and shorter time to postoperative liquid diet (72 h vs. 96 h, p = 0.05). There were no significant differences in both early and late postoperative complications. The 3-year overall survival was 85.9% in the laparoscopic group and 76.9% in the open group (p = 0.75), respectively. The 3-year disease-free survival was 70.6% in the laparoscopic group and 74.1% in the open group (p = 0.83), respectively. CONCLUSION Laparoscopic LLND had comparable oncological outcomes to open LLND. Moreover, laparoscopic LLND had postoperative recovery advantages over open LLND.