Association of DNA repair gene XRCC1 and lung cancer susceptibility among nonsmoking Chinese women

Cancer Genet Cytogenet. 2009 Jan 1;188(1):26-31. doi: 10.1016/j.cancergencyto.2008.08.013.


Nonsmokers who develop lung cancer provide a good model for investigating the effect of genetic polymorphisms. XRCC1 is one of the major DNA repair proteins involved in the base-excision repair pathway. XRCC1 gene variations may lead to lower DNA repair capacity and thus confer inherited predisposition to cancer risk. To address this question in more detail, we conducted a hospital-based case-control study consisting of 55 lung cancer cases and 74 cancer-free controls matched on age and ethnicity among nonsmoking Chinese women. We analyzed five coding single-nucleotide polymorphisms in the XRCC1 gene: Agr194Trp, Arg280His, Arg399Gln, Pro206Pro, and Gln632Gln. Polymerase chain reaction-restriction fragment length polymorphism was used for genotyping. Carriers of the variant T-allele of Arg194Trp had a lower lung cancer risk than carriers of CC genotypes [odds ratio (OR)=0.46, 95% confidence interval (CI)=0.22-0.96, P=0.04], and carriers of the variant G-allele of Pro206Pro were at almost fourfold (OR=3.93, 95%CI=1.47-10.52, P=0.004) higher risk of lung cancer than carriers of the AA genotype. Furthermore, we observed that individuals with haplotype 1(194(T)-206(A)-280(G)-399(G)-632(G)) had decreased risk of lung cancer (OR=0.51, 95%CI= 0.27-0.97, P=0.04) and subjects with haplotype 2 (194(C)-206(G)280(G)-399(G)- 632(A)) had almost a threefold increased risk of lung cancer (OR=3.01, 95%CI=1.01-8.92, P=0.04). These findings further suggest that the polymorphisms XRCC1 Arg194Trp and Pro206Pro or the haplotype encompassing the variant alleles may contribute to susceptibility of lung cancer in a Chinese population.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Case-Control Studies
  • Chi-Square Distribution
  • China
  • DNA-Binding Proteins / genetics*
  • Female
  • Gene Frequency
  • Genetic Predisposition to Disease*
  • Humans
  • Linkage Disequilibrium
  • Lung Neoplasms / epidemiology
  • Lung Neoplasms / genetics*
  • Middle Aged
  • Polymerase Chain Reaction / methods
  • Polymorphism, Restriction Fragment Length
  • Polymorphism, Single Nucleotide
  • Risk Factors
  • Smoking
  • X-ray Repair Cross Complementing Protein 1


  • DNA-Binding Proteins
  • X-ray Repair Cross Complementing Protein 1
  • XRCC1 protein, human