title: XRCC1 Arg399Gln polymorphism is not associated with breast cancer in Chinese.
abstract: BACKGROUND
  A number of studies have been conducted to explore the association of XRCC1 polymorphisms with Breast cancer (BC) risk in Asians, but the results have been inconsistent. We therefore performed the present meta-analysis to explore the relationship in detail.
  
  
  METHODS
  Reported studies were searched from 1990 to October 15, 2014 in PubMed and Wan fang Med Online. We performed a meta-analysis of 13 published case-control studies fitting our eligibility criteria. These studies involved XRCC1 Arg399Gln polymorphisms in 4984 BC cases and 5744 controls in dominant (ArgArg vs. GlnGln+ArgGln), recessive (ArgGln+ArgArg vs. GlnGln), and co-dominant (ArgArg vs. GlnGln) inheritance models. The total odds Ratio (OR) and 95% CI were calculated and analyzed by Review Manager 5.2 and STATE 12.
  
  
  RESULTS
  Overall, significantly increased BC risk was observed in any genetic model (dominant model: odds ration [OR] = 1.31, 95% confidence interval [CI] = [1.08, 1.58]; recessive model: OR = 0.63, 95% CI = [0.50, 0.81]; codominant model: OR = 2.52, 95% CI: [1.38, 4.60]) when all eligible studies were pooled into the meta-analysis. In further stratified analyses, no association was found between Arg399Gln polymorphism and BC risk in Chinese fewer than three hereditary models.
  
  
  CONCLUSIONS
  Our results suggest that the XRCC1 Arg399Gln polymorphism may be associated with increased Breast cancer risk among Asians, except Chinese population.
authors.affiliation: Department of Clinical Laboratory, The First Affiliated Hospital of Zhengzhou University Zhengzhou 450002, Henan, P. R. China.
authors.forename: Shuren
authors.initials: S
authors.lastname: Guo
authors.affiliation: Department of Clinical Laboratory, Zhengzhou Yihe Hospital Zhengzhou 450002, Henan, P. R. China.
authors.forename: Xiaohuan
authors.initials: X
authors.lastname: Mao
authors.affiliation: Department of Clinical Laboratory, The First Affiliated Hospital of Zhengzhou University Zhengzhou 450002, Henan, P. R. China.
authors.forename: Liang
authors.initials: L
authors.lastname: Ming
keywords: Arg399Gln; XRCC1 gene; breast cancer; polymorphism