title: Association between XRCC1 gene polymorphisms and risk of glioma development: a meta-analysis.
abstract: OBJECTIVE
  Previous studies of the association between X-ray cross-complementing group 1 (XRCC1) gene polymorphisms and the gliomas risk have yielded conflicting results, and thus a meta-analysis was performed to provide a more accurate estimation.
  
  
  METHODS
  A computerized literature search of 5 electronic databases was conducted to identify the relevant studies. Fixed or random effect models were selected based on the heterogeneity test. Publication bias was estimated using Begg's funnel plots and Egger's regression test.
  
  
  RESULTS
  A total of 11 studies (3,810 cases and 6,079 controls), 7 studies (2,928 cases and 5,048 controls), and 4 studies (1,461 cases and 2,593 controls) were finally included in the analyses of the association between XRCC1 Arg399Gln, Arg194Trp, and Arg280His polymorphisms and glioma risk, respectively. The pooled results showed that GlnGln carriage was associated with moderately increased risk of gliomas in Asians (GlnGln vs. ArgArg, OR=1.490, 95%CI 1.031-2.153; GlnGln/ArgGln vs. ArgArg, OR=1.321, 95%CI 1.037- 1.684), whereas a marginal association was revealed in Caucasians. For the Arg194Trp polymorphism, although a significant association was shown in the homozygous genotype comparisons (TrpTrp vs. ArgArg, OR = 2.209, 95%CI 1.398- 2.945), no significant link was found on subgroup analysis stratified by ethnicity. With regard to the Arg280His polymorphism, no significant association was found in each comparison. No particular study was found to significantly influence the pooled results, and no potential publication bias was detected.
  
  
  CONCLUSIONS
  This meta-analysis suggested that the XRCC1 Arg399Gln polymorphism is moderately associated with increased risk of gliomas in Asians, while Arg194Trp and Arg280His polymorphisms demonstrated no significant influence. Due to the limited studies and the potential confounders, further studies are needed to confirm these results.
authors.affiliation: Department of Neurosurgery, the First Affiliated Hospital of Baotou Medical College, Baotou, Inner Mongolia, China.
authors.forename: Jian-Ying
authors.initials: JY
authors.lastname: Sun
authors.forename: Chun-Yang
authors.initials: CY
authors.lastname: Zhang
authors.forename: Zhen-Jun
authors.initials: ZJ
authors.lastname: Zhang
authors.forename: Yan-Fang
authors.initials: YF
authors.lastname: Dong
authors.forename: An-Long
authors.initials: AL
authors.lastname: Zhang
authors.forename: Zhi-Wei
authors.initials: ZW
authors.lastname: Wang
authors.forename: Xiao-Long
authors.initials: XL
authors.lastname: Mei
mesh_terms: D044466:Asian People / Q000235:genetics; D016001:Confidence Intervals; D004268:DNA-Binding Proteins / Q000235:genetics*; D005910:Glioma / Q000208:ethnology / Q000235:genetics*; D006801:Humans; D016017:Odds Ratio; D020641:Polymorphism, Single Nucleotide; D017594:Publication Bias; D012307:Risk Factors; D044465:White People / Q000235:genetics; D000076105:X-ray Repair Cross Complementing Protein 1
chemical_list: D004268:DNA-Binding Proteins; D000076105:X-ray Repair Cross Complementing Protein 1; C000619371:XRCC1 protein, human