title: [Meta-analysis of extralevator abdominoperineal excision and conventional abdominoperineal excision for low rectal cancer].
abstract: OBJECTIVE
  To evaluate the perforation, circumferential resection margin (CRM) and postoperative perineal wound complications after extralevator abdominoperineal excision (ELAPE) and conventional abdominoperineal excision (APE) for low rectal cancer by using systematic review method.
  
  
  METHODS
  The Cochrane Library, PubMed, EMbase, CNKI and VIP database were searched for literatures in which ELAPE and APE were compared for the treatment of low rectal cancer. Meta-analysis was performed to deal with data extracted by Cochrane Systematic Reviews methods.
  
  
  RESULTS
  Six studies met the inclusion criteria including one randomized control study and five non-randomized control studies with a total of 656 cases including 346 cases of ELAPE and 310 cases of APE. Meta-analysis showed a lower positive CRM rate (RR=0.48, 95%CI:0.36-0.65) and a lower local recurrence rate (RR=0.43, 95%CI:0.19-0.99) in ELAPE compared with APE. There were no significant differences in operative perforation rate (RR=0.45, 95%CI:0.15-1.37) and post-operative perineal wound complications rate (RR=1.20, 95%CI:0.57-2.50) between the two surgical procedures.
  
  
  CONCLUSIONS
  ELAPE is associated with lower rates of positive CRM and local recurrence compared with APE.
authors.affiliation: Department of General Surgery, Qingdao University Medical College, Qingdao, China.
authors.forename: Hong-yuan
authors.initials: HY
authors.lastname: Jiang
authors.forename: Yan-bing
authors.initials: YB
authors.lastname: Zhou
authors.forename: Dong-feng
authors.initials: DF
authors.lastname: Zhang
mesh_terms: D006801:Humans; D010502:Perineum / Q000601:surgery*; D016032:Randomized Controlled Trials as Topic; D012004:Rectal Neoplasms / Q000601:surgery*; D016896:Treatment Outcome