title: Polymorphisms of the DNA repair gene XRCC1 and risk of gastric cancer in a Chinese population.
abstract: Gastric cancer remains the leading cause of cancer death in China and other countries in eastern Asia. Studies of gastric cancer have revealed that it is a disease of complex etiology involving dietary, infectious, environmental, occupational and genetic factors. DNA repair capacity has been suggested as a genetic factor contributing to variation in susceptibility to cancer. In the present study, we described an association between 2 polymorphisms of the DNA repair gene XRCC1 and risk of gastric cancer in a Chinese population. We used a polymerase chain reaction-based assay to detect Pvu II and Nci I restriction fragment length polymorphisms (XRCC1 26304 C-->T and XRCC1 28152 G-->A, respectively) in 188 patients with gastric cancer and 166 healthy controls. The XRCC1 26304 T allele (194Trp) frequency (34.6%) was higher and the XRCC1 28152 A allele (399Gln) frequency (25.6%) was lower in healthy Chinese controls than previously reported healthy U.S. Caucasian controls (7.2% and 34.1%, respectively). Multivariate logistic regression analysis revealed that the putative high-risk genotypes XRCC1 26304 CC and XRCC1 28152 GA/AA were associated with a non-significant increased risk for gastric cancer (adjusted odds ratio [OR]=1.45, 95% confidence interval [CI]= 0.93-2.25 and OR=1.53, 95% CI= 0.98-2.39, respectively) compared with other genotypes. However, the XRCC1 26304 CC genotype was associated with a significantly increased risk for gastric cardia cancer (adjusted OR=1.86, 95% CI=1.09-3.20). Individuals with both putative high-risk genotypes (CC and GA/AA) had a significantly higher risk (adjusted OR=1.73, 95% CI=1.12-2.69), particularly for gastric cardia cancer (adjusted OR=2.18, 95% CI=1.21-3.94) than individuals with other genotypes. These findings support the hypothesis that these 2 XRCC1 variants may contribute to the risk of developing gastric cancer, particularly gastric cardia cancer.
authors.affiliation: Department of Epidemiology and Statistics, School of Public Health, Nanjing Medical University, Nanjing, China.
authors.forename: H
authors.initials: H
authors.lastname: Shen
authors.forename: Y
authors.initials: Y
authors.lastname: Xu
authors.forename: Y
authors.initials: Y
authors.lastname: Qian
authors.forename: R
authors.initials: R
authors.lastname: Yu
authors.forename: Y
authors.initials: Y
authors.lastname: Qin
authors.forename: L
authors.initials: L
authors.lastname: Zhou
authors.forename: X
authors.initials: X
authors.lastname: Wang
authors.forename: M R
authors.initials: MR
authors.lastname: Spitz
authors.forename: Q
authors.initials: Q
authors.lastname: Wei
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000428:Alcohol Drinking; D044466:Asian People / Q000235:genetics; D002681:China; D004260:DNA Repair; D004268:DNA-Binding Proteins / Q000235:genetics*; D015252:Deoxyribonucleases, Type II Site-Specific; D005260:Female; D005787:Gene Frequency; D016481:Helicobacter Infections / Q000453:epidemiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D016133:Polymerase Chain Reaction / Q000379:methods; D011110:Polymorphism, Genetic; D012150:Polymorphism, Restriction Fragment Length; D012016:Reference Values; D012044:Regression Analysis; D012307:Risk Factors; D012907:Smoking; D013274:Stomach Neoplasms / Q000453:epidemiology* / 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; C025630:CAGCTG-specific type II deoxyribonucleases; C035801:CCSGG-specific type II deoxyribonucleases; D015252:Deoxyribonucleases, Type II Site-Specific