title: GPx-1 polymorphism (rs1050450) contributes to tumor susceptibility: evidence from meta-analysis.
abstract: OBJECTIVE
  Accumulating evidences implicate the selenium-containing cytosolic glutathione peroxidase, GPx-1, as a determinant of cancer risk and a mediator of the chemopreventive properties of selenium. Since the identification of a well-characterized functional polymorphism named Pro198Leu (rs1050450 C>T) in GPx-1, abundant studies have evaluated the association between Pro198Leu polymorphism and tumor risk in diverse population. But, the available results are conflicting.
  
  
  METHODS
  To derive a more precise estimation, we performed a meta-analysis based on 14,372 cases with different tumor types and 18,081 controls from 31 published case-control studies. Published literature from PubMed was retrieved. Crude odds ratios (ORs) with 95% confidence intervals (CIs) were calculated to estimate the strength of the association.
  
  
  RESULTS
  Overall, the results indicated that individuals who carried variant Leu allele (Pro/Leu and Leu/Leu) were associated with an increased cancer risk [odds ratio (OR) = 1.12, 95% confidence interval (CI) = 1.02-1.23] in a dominant genetic model. In further subgroup analyses, the increased risk of cancer was observed in subgroup of Asians and sample size more than 500 subjects.
  
  
  CONCLUSIONS
  These results suggest that the GPx-1 Pro198Leo polymorphism contributes to cancer susceptibility through a disturbed antioxidant balance.
authors.affiliation: Department of Urology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China.
authors.forename: Jiawei
authors.initials: J
authors.lastname: Chen
authors.forename: Qiang
authors.initials: Q
authors.lastname: Cao
authors.forename: Chao
authors.initials: C
authors.lastname: Qin
authors.forename: Pengfei
authors.initials: P
authors.lastname: Shao
authors.forename: Yilong
authors.initials: Y
authors.lastname: Wu
authors.forename: Meilin
authors.initials: M
authors.lastname: Wang
authors.forename: Zhengdong
authors.initials: Z
authors.lastname: Zhang
authors.forename: Changjun
authors.initials: C
authors.lastname: Yin
mesh_terms: D005260:Female; D020022:Genetic Predisposition to Disease; D005979:Glutathione Peroxidase / Q000235:genetics* / Q000502:physiology; D006801:Humans; D008297:Male; D009369:Neoplasms / Q000209:etiology / Q000235:genetics*; D011110:Polymorphism, Genetic; D017594:Publication Bias; D000094765:Glutathione Peroxidase GPX1
chemical_list: D005979:Glutathione Peroxidase; D000094765:Glutathione Peroxidase GPX1; C000722067:GPX1 protein, human