Asian Pacific Journal of Cancer Prevention

Asian Pacific Journal of Cancer Prevention (아시아태평양암예방학회)
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Estrogen Receptor Alpha Gene Polymorphisms and Breast Cancer Risk: a Case-control Study with Meta-analysis Combined

  • Lu, Hong (Department of Laboratory Medicine, First Affiliated Hospital of Wenzhou Medical University) ;
  • Chen, Dong (Wenzhou Center of Disease Control and Prevention) ;
  • Hu, Li-Ping (Department of Laboratory Medicine, First Affiliated Hospital of Wenzhou Medical University) ;
  • Zhou, Lian-Lian (Department of Laboratory Medicine, First Affiliated Hospital of Wenzhou Medical University) ;
  • Xu, Hui-Ying (Department of Laboratory Medicine, First Affiliated Hospital of Wenzhou Medical University) ;
  • Bai, Yong-Heng (Wenzhou Key Laboratory of Surgery, First Affiliated Hospital of Wenzhou Medical University) ;
  • Lin, Xiang-Yang (Department of Laboratory Medicine, First Affiliated Hospital of Wenzhou Medical University)
  • Published : 2013.11.30
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Abstract

Molecular epidemiological studies have shown that gene polymorphisms of estrogen receptor alpha gene (ESR-${\alpha}$) are associated with breast cancer risk. However, previous results from many molecular studies have been inconsistent. In this study, we examined two polymorphisms (PvuII and XbaI RFLPs) of the ESR-${\alpha}$ gene in 542 breast cancer cases and 1,016 controls from China. Associations between the polymorphisms and breast cancer risk were calculated with an unconditional logistic regression model. Linkage disequilibrium and haplotypes were analyzed with the SHEsis software. In addition, we also performed a systematic meta-analysis of 24 published studies evaluating the association. No significant associations were found between the PvuII polymorphism and breast cancer risk. However, a significantly decreased risk of breast cancer was observed among carriers of the XbaI 'G' allele (age-adjusted OR = 0.80; 95% CI = 0.66- 0.97) compared with carriers of the 'A' allele. Haplotype analysis showed significantly decreased cancer risk for carriers of the 'CG' haplotype (OR = 0.79; 95% CI = 0.66- 0.96). In the systematic meta-analysis, the XbaI 'G' allele was associated with an overall significantly decreased risk of breast cancer (OR = 0.90, 95% CI = 0.82- 1.00). In addition, the PvuII 'C' allele showed a 0.96- fold decreased disease risk (95% CI = 0.92- 0.99). In subgroup analysis, an association between the PvuII 'C' and XbaI 'G' alleles and breast cancer risk was significant in Asians ('C' vs. 'T': OR = 0.93, 95% CI = 0.85- 1.00; 'G' vs. 'A': OR = 0.82, 95% CI = 0.68- 0.98), but not in Euro-Americans. Thus, our results provide evidence that ESR-${\alpha}$ polymorphisms are associated with susceptibility to breast cancer. These associations may largely depend on population characteristics and geographic location.

Keywords

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