Laparoscopic extralevator abdominoperineal excision in distal rectal cancer patients: a retrospective comparative study

BACKGROUND: At present, abdominoperineal excision with neoadjuvant chemoradiotherapy (nCRT) is one of the treatment modalities of distal rectal cancer. Our study analyzed the effects of laparoscopic extralevator abdominoperineal resection (ELAPE) compared with laparoscopic conventional abdominoperineal resection(cAPR) in the treatment of distal rectal cancer. METHODS: Retrospective analysis was conducted on the clinicopathological data of 177 distal rectal cancer patients treated with a laparoscopic abdominoperineal resection between 2011 and 2018. The patients were divided into four groups as follows: ELAPE without nCRT (group A), cAPR without nCRT (group B), ELAPE with long-course nCRT (group C) and cAPR with long-course nCRT (group D). RESULTS: Positive circumferential resection margin (CRM), local recurrence rate, 3-year disease-free survival (DFS) and 3-year overall survival (OS) did not differ between group A and group B. The rate of positive CRM in group C was lower than group D (4.4% vs. 11.9%, respectively), although the difference was not significant (P = 0.377). The 3-year local recurrence rate in group C was lower compared with group D (6.6% vs. 16.7%, respectively), although the difference was not significant (P = 0.135). Three-year DFS and 3-year OS were not different between groups C and D. CONCLUSIONS: This study showed that the effect of laparoscopic ELAPE in patients with low-risk rectal cancer is similar to laparoscopic cAPR, revealing that laparoscopic cAPR can be routinely selected for patients with low-risk rectal cancer. Furthermore, laparoscopic ELAPE has a tendency to reduce the rate of positive CRM and local recurrence in patients with high-risk rectal cancer. Laparoscopic ELAPE can be routinely considered for patients with high-risk rectal cancer.