title: XRCC1 polymorphisms and cancer risk: a meta-analysis of 38 case-control studies.
abstract: Several potential functional polymorphisms (Arg194Trp, Arg280His, Arg399Gln) in the DNA base excision repair gene X-ray repair cross-complementing group 1 (XRCC1) have been implicated in cancer risk. Our meta-analysis on total of 11,957 cancer cases and 14,174 control subjects from 38 published case-control studies showed that the odds ratio (OR) for the variant genotypes (Trp/Trp + Arg/Trp) of the Arg194Trp polymorphism, compared with the wild-type homozygote (Arg/Arg), was 0.89 [95% confidence interval (95% CI), 0.81-0.98] for all tumor types without between-study heterogeneity. Similarly, the overall risk for the combined variant genotypes (His/His + Arg/His) of the Arg280His, compared with the wild homozygote (Arg/Arg), was 1.19 (95% CI, 1.00-1.42). However, there was no main effect in either recessive or dominant modeling for the Arg399Gln, and the variant Gln/Gln homozygote was not associated with overall cancer risk (OR, 1.01; 95% CI, 0.90-1.14). The analyses suggest that XRCC1 Arg194Trp, Arg280His polymorphisms may be biomarkers of cancer susceptibility and a single larger study with thousands of subjects and tissue-specific biochemical and biological characterization is warranted to further evaluate potential gene-to-gene and gene-to-environment interactions on XRCC1 polymorphisms and cancer risk.
authors: Department of Epidemiology and Biostatistics, Nanjing Medical University School of Public Health, 140 Hanzhong Road, 210029 Nanjing, China.
authors: Zhibin
authors: Z
authors: Hu
authors: Hongxia
authors: H
authors: Ma
authors: Feng
authors: F
authors: Chen
authors: Qingyi
authors: Q
authors: Wei
authors: Hongbing
authors: H
authors: Shen
mesh_terms: D016022:Case-Control Studies; D004268:DNA-Binding Proteins / Q000235:genetics*; D005006:Ethnicity; D005838:Genotype; D006801:Humans; D009369:Neoplasms / Q000235:genetics*; D011110:Polymorphism, Genetic; 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