Variants of estrogen-related genes and breast cancer risk in European and African American women

Lei Quan, Chi Chen Hong, Gary Zirpoli, Michelle R. Roberts, Thaer Khoury, Lara E. Sucheston-Campbell, Dana H. Bovbjerg, Lina Jandorf, Karen Pawlish, Gregory Ciupak, Warren Davis, Elisa V. Bandera, Christine B. Ambrosone

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

It has been observed previously that compared with women of European ancestry (EA), those of African ancestry (AA) are more likely to develop estrogen receptor (ER)-negative breast cancer, although the mechanisms have not been elucidated. We tested the associations between breast cancer risk and a targeted set of 20 genes known to be involved in estrogen synthesis, metabolism, and response and potential gene-environment interactions using data and samples from 1307 EA (658 cases) and 1365 AA (621 cases) participants from the Women's Circle of Health Study (WCHS). Multivariable logistic regression found evidence of associations with single-nucleotide polymorphisms (SNPs) in the ESR1 gene in EA women (rs1801132, odds ratio (OR)=1.47, 95% CI=1.20-1.80, P=0.0002; rs2046210, OR=1.24, 95% CI=1.04-1.47, P=0.02; and rs3020314, OR=1.43, 95% CI=1.19-1.70, P=0.00009), but not in AA women. The only other gene associated with breast cancer risk was CYP1A2 in AA women (rs2470893, OR=1.42, 95% CI=1.00-2.02, P=0.05), but not in EA women. When stratified by ER status, ESR1 rs1801132, rs2046210, and rs3020314 showed stronger associations in ER-positive than in ER-negative breast cancer in only EA women. Associations with the ESR1 SNPs in EA women also appeared to be stronger with longer endogenous estrogen exposure or hormonal replacement therapy use. Our results indicate that there may be differential genetic influences on breast cancer risk in EA compared with AA women and that these differences may be modified by tumor subtype and estrogen exposures. Future studies with a larger sample size may determine the full contribution of estrogen-related genes to racial/ethnic differences in breast cancer.

Original languageEnglish (US)
Pages (from-to)853-864
Number of pages12
JournalEndocrine-Related Cancer
Volume21
Issue number6
DOIs
StatePublished - Dec 1 2014

All Science Journal Classification (ASJC) codes

  • Endocrinology
  • Oncology
  • Cancer Research
  • Endocrinology, Diabetes and Metabolism

Keywords

  • African-American
  • Breast cancer
  • Disparity
  • ESR1
  • Estrogen metabolism
  • Estrogen receptor
  • Estrogen response
  • Estrogen synthesis

Fingerprint

Dive into the research topics of 'Variants of estrogen-related genes and breast cancer risk in European and African American women'. Together they form a unique fingerprint.

Cite this