title: A systematic review and meta-analysis of oncologic outcomes of pre- versus postoperative radiation in localized resectable soft-tissue sarcoma.
abstract: BACKGROUND
  The goal of this study was to determine the oncologic outcomes in localized resectable soft-tissue sarcoma after pre- versus postoperative radiation.
  
  
  METHODS
  Literature searches through MEDLINE, EMBASE, CancerLit, and the Cochrane Database were performed with the following search terms: sarcoma, radiation, preoperative, and postoperative. Two reviewers independently assessed all eligible publications with the Detsky Quality Scale for Randomized Trials and the Newcastle-Ottawa Quality Assessment Scale for case-control studies. The primary outcome measure was the pooled odds ratio and 95% confidence intervals (95% CI) for the risk of local recurrence calculated through the fixed- and random-effects methods. Time-dependent survival data were calculated as an average across all studies.
  
  
  RESULTS
  Five eligible studies were identified including a total of 1,098 patients. The P value for heterogeneity was 0.259, and the variability (I (2)) in results across studies due to true differences in treatment effect was 25%. The risk for local recurrence was lower in the preoperative group with an odds ratio of 0.61 (95% CI 0.42-0.89) by means of the fixed-effects method, and an odds ratio of 0.67 (95% CI 0.39-1.15) by means of the random-effects method. Average survival was 76% (range 62-88%) in the preoperative group and 67% (range 41-83%) in the post-operative group.
  
  
  CONCLUSIONS
  The delay in surgical resection necessary to complete preoperative radiation does not seem to increase the risk of lethal metastatic spread. The risk of local recurrence may be lower after preoperative radiation. These findings must be interpreted with caution because of the heterogeneity and bias in the available studies.
authors.affiliation: McMaster University and Hamilton Health Sciences, Hamilton, ON, Canada.
authors.forename: Emad
authors.initials: E
authors.lastname: Al-Absi
authors.forename: Forough
authors.initials: F
authors.lastname: Farrokhyar
authors.forename: Rajrish
authors.initials: R
authors.lastname: Sharma
authors.forename: Kaitlyn
authors.initials: K
authors.lastname: Whelan
authors.forename: Tom
authors.initials: T
authors.lastname: Corbett
authors.forename: Malti
authors.initials: M
authors.lastname: Patel
authors.forename: Michelle
authors.initials: M
authors.lastname: Ghert
mesh_terms: D006801:Humans; D011184:Postoperative Period; D012509:Sarcoma / Q000532:radiotherapy*; D016896:Treatment Outcome