The polymorphism of XRCC1 and coronary artery disease risk: a meta-analysis.

OBJECTIVE Coronary artery disease (CAD) is a life-threatening disease and is caused by various factors, with genetic variation being an important risk factor. The association between X-ray repair cross-complementing group 1 (XRCC1) polymorphisms and CAD has been extensively studied with conflicting results. We performed a meta-analysis to investigate the overall association between XRCC1 polymorphisms and CAD risk. MATERIALS AND METHODS We searched PubMed and Embase databases until October 19, 2016. The total number and distribution of genotypes, genotyping methods, and ethnicity were extracted. Overall and subgroup analyses were performed. RESULTS A total of seven publications involving 1.862 subjects and 1.568 controls were included in this meta-analysis. The Arg399Gln and Arg194Trp polymorphisms of XRCC1 were analyzed. The results indicated that the XRCC1 Arg399Gln homozygous GG genotype showed no association with CAD risk [GG vs. GA+AA: odd's ratio (OR) = 0.95, 95% confidence interval (CI) = 0.82-1.11, p = 0.53] both in the overall and subgroups evaluation. However, the XRCC1 Arg194Trp homozygous TT genotype was associated with an increased CAD risk [(TT vs. TC+CC: OR =1.52, 95%CI = 1.16-2.00, p=0.003)]. Subgroup analysis based on ethnicity showed a significant increase in the association of CAD risk and the Arg194Trp gene polymorphism among the Asian population. CONCLUSIONS This meta-analysis suggested that TT genotype in the Arg194Trp polymorphism contributes to the CAD susceptibility, particularly in the Asian population.