[Effect of preoperative long course radiotherapy on anastomotic leakage after low anterior resection for rectal cancer: a Meta-analysis].

OBJECTIVE To assess the effect of preoperative long course radiotherapy (RT) on anastomotic leakage (AL) after low anterior resection(LAR) for rectal cancer. METHODS Medline, EMBASE, China National Knowledge Infrastructure,the Cochrane Library databases and other databases were searched for relevant studies. Correlation between preoperative long course RT and AL after LAR for rectal cancer was examined. Review Manager 5.2 software was used to pool raw data and test the heterogeneity of existing studies and to calculate the incorporated odds ratio (OR) and 95% confidence interval (95%CI). Finally, forest plots and funnel plots were created to allow for visual comparison of the results or the effect of publication bias. RESULTS A total of 881 studies were identified and 10 studies (n=7829) were eligible for the meta-analysis, including 2581 cases of preoperative RT, and 5248 cases of surgery alone without RT. There was no significant difference in anastomotic leakage rate between the two groups (OR:1.17, 95%CI:0.98-1.39, P=0.09). CONCLUSIONS Preoperative long course RT did not increase the risk of postoperative AL after LAR in patients with rectal cancer.