Polymorphisms of XRCC1 and risk of esophageal and gastric cardia cancer

被引:64
|
作者
Ratnasinghe, LD
Abnet, C
Qiao, YL
Modali, R
Stolzenberg-Solomon, R
Dong, ZW
Dawsey, SM
Mark, SD
Taylor, PR
机构
[1] US FDA, Natl Ctr Toxicol Res, Ctr Struct Genomics, Jefferson, AR 72079 USA
[2] NCI, Canc Prevent Studies Branch, Clin Res Ctr, Rockville, MD USA
[3] Chinese Acad Med Sci, Beijing 100037, Peoples R China
[4] BioServe Biotechnol Ltd, Laurel, MD USA
[5] NCI, Nutr Epidemiol Branch, Div Canc Epidemiol & Genet, Rockville, MD USA
[6] NCI, Biostat Branch, Div Canc Epidemiol & Genet, Rockville, MD USA
关键词
esophageal cancer; gastric cardia cancer; polymorphism; XRCC1;
D O I
10.1016/j.canlet.2004.03.012
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Background: Linxian, a rural county in North Central China, has among the highest rates of esophageal squamous cell carcinoma and gastric cardia adenocarcinoma in the world. In a nested case-cohort study that originated from two cancer prevention trials in Linxian, we examined the relationship between these cancers and two polymorphisms in the DNA repair gene XRCC1. Methods: We conducted a case-cohort study among individuals in the cohort who were alive and cancer free in 199 1, and had blood samples for DNA extraction. Real time Taqman analyses were conducted to genotype incident cancer cases (n = 221, 131 esophageal and 90 gastric cardia cancer cases) that developed through May 1996, and on an age- and sex-matched reference cohort (n = 454). We used Cox proportional hazard models to estimate relative risks (RR) and 95% confidence intervals (95% CI). Results: We observed no association between the variant genotype in XRCC1 Arg194Trp (codon 194 arganine to tryptophan substitution) and esophageal or gastric cardia cancer. However, carrying at least one copy of the variant allele in XRCC1 Arg399Gln (codon 399 arganine to glutamine substitution) was associated with reduced risk of gastric cardia cancer (RR: 0.60, 95% CI: 0.37-0.97) and the combined category esophageal/gastric cancer (RR: 0.67, 95% CI: 0.48-0.95). In combined polymorphisms analyses, we observed a significant reduction in risk of combined esophageal/gastric cancer among individuals that had both the XRCC1 Arg194Trp and Arg399Gln variant genotyopes (RR: 0.47, 95% CI: 0.26-0.84). Conclusions: Our results suggest that the XRCC1 Arg399Gln variant genotype is associated with reduced risk of upper GI cancer and that individuals with both XRCC1 variant genotypes are also at significantly reduced risk of upper GI cancer in this high-risk Chinese population. (C) 2004 Published by Elsevier Ireland Ltd.
引用
收藏
页码:157 / 164
页数:8
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