X-ray repair cross-complementing group 1 (XRCC1) Arg399Gln polymorphism significantly associated with prostate cancer

Prostate cancer (Pca) is one of the noncutaneous cancers occurring worldwide. Its high morbidity and mortality make it a concern. X-ray repair cross-complementing group 1 (XRCC1) Arg399Gln polymorphism (rs25487) has been reported to be related to Pca. However, the conclusions are controversial. In this study, PubMed, HuGENet and Chinese National Knowledge Infrastructure (CNKI) databases were combined with a comprehensive literature search. Four models including dominant (AA + AG vs. GG), recessive (AA vs. AG+GG), codominant (AA vs. AG, AA vs. GG) and per-allele analysis (A vs. G) were applied. Finally, 15 studies with 18 sets of data were included. A positive association was discovered in pooled results for recessive (odds ratio [OR]=1.202, 95% confidence interval [95% CI], 1.060-1.363, I-2=46.20%), codominant (AA vs. AG; OR=1.258, 95% CI, 1.099-1.439, I-2=38.50%; AA vs. GG; OR=1.283, 95% CI, 1.027-1.602, I-2=51.70%) and allele analysis (OR=1.116, 95% CI, 1.001-1.244, I-2=58.00%). In ethnicity subgroup analysis, these 4 models were also significant in the Asian subgroup. However, for whites, only 2 models seemed to be significant (AA vs. AG+ GG: OR=1.525, 95% CI, 1.111-2.093, I-2=52.60%; AA vs. AG: OR=1.678, 95% CI, 1.185-2.375, I-2=30.70%). In further analysis, we regrouped the data based on race, in which pooled results and Asian subgroup were again shown to be positive. In the next analysis, expression quantitative trait loci (eQTL), linkage disequilibrium (LD), TagSNP and functional analysis were used. The results showed that the SNP was a tag and functional SNP with LD block in both Asians and whites. In summary, we suggest that XRCC1 Arg399Gln might be significantly associated with development of Pca.