XRCC2 Arg188His polymorphism is not directly associated with breast cancer risk: evidence from 37,369 subjects

Breast Cancer Research and Treatment
Ke-Da YuZhi-Ming Shao

Abstract

Several common single-nucleotide polymorphisms (SNPs) within the XRCC2 gene have been identified as potential breast cancer susceptibility loci and a coding SNP in exon 3 (Arg188His, rs3218536) has been extensively studied, though the results were inconclusive. We, in this study, performed a more convincing and precise estimation of the relationship between Arg188His and breast cancer by meta-analyzing the currently available evidence from literature. A total of 16 studies involving 18,341 cases and 19,028 controls (37,369 subjects) were identified for meta-analysis. Crude odds ratios (ORs) with 95% confidence intervals (CIs) were used to assess the strength of association in the codominant model, dominant model, and recessive model. When all the studies were pooled into meta-analysis, there was no evidence of a significant association between Arg188His and breast cancer risk in any genetic models. Notably, Arg188His tended to be related to breast cancer in a fixed-effects, dominant model (OR = 0.922, 95% CI: 0.870-0.978, P = 0.007); however, since there was a between-study heterogeneity (P (h) = 0.014), we assessed the association using a random-effects model instead and no significance was observed (OR = 0.932, 95% CI: 0.852-...Continue Reading

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