Several case–control studies investigating the relationship between genetic polymorphisms of glutathione S-transferase (GST) M1, GSTT1, and GSTP1 (rs1695) and the risk of breast cancer have reported contradictory results. We therefore performed a meta-analysis to clarify this issue.
An updated meta-analysis using PubMed and Web of Knowledge databases for the eligible case–control studies was performed. Random- or fixed-effects model was used.
A total of 10,067 cancer cases and 12,276 controls in 41 independent case–control studies from 19 articles were included in this meta-analysis. Significant increase in risk of breast cancer for Asians was found in GSTM1-null genotype ( P=0.012, odds ratio [OR] =1.17, 95% confidence interval [CI] =1.04–1.32) and GSTT1-null genotype ( P=0.039, OR =1.19, 95% CI =1.01–1.41). In addition, our results showed that the GSTP1 (rs1695) polymorphisms can significantly increase the risk among Caucasians ( P=0.042, OR =1.16, 95% CI =1.01–1.34). Sensitivity analysis and publication bias further confirmed the dependability of the results in this meta-analysis.