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Published in: Breast Cancer Research 2/2012

Open Access 01-04-2012 | Research article

Variants in the vitamin D pathway, serum levels of vitamin D, and estrogen receptor negative breast cancer among African-American women: a case-control study

Authors: Song Yao, Gary Zirpoli, Dana H Bovbjerg, Lina Jandorf, Chi Chen Hong, Hua Zhao, Lara E Sucheston, Li Tang, Michelle Roberts, Gregory Ciupak, Warren Davis, Helena Hwang, Candace S Johnson, Donald L Trump, Susan E McCann, Foluso Ademuyiwa, Karen S Pawlish, Elisa V Bandera, Christine B Ambrosone

Published in: Breast Cancer Research | Issue 2/2012

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Abstract

Introduction

American women of African ancestry (AA) are more likely than European Americans (EA) to have estrogen receptor (ER)-negative breast cancer. 25-hydroxyvitamin D (25OHD) is low in AAs, and was associated with ER-negative tumors in EAs. We hypothesized that racial differences in 25OHD levels, as well as in inherited genetic variations, may contribute, in part, to the differences in tumor characteristics.

Methods

In a case (n = 928)-control (n = 843) study of breast cancer in AA and EA women, we measured serum 25OHD levels in controls and tested associations between risk and tag single nucleotide polymorphisms (SNPs) in VDR, CYP24A1 and CYP27B1, particularly by ER status.

Results

More AAs had severe vitamin D deficiency (< 10 ng/ml) than EAs (34.3% vs 5.9%), with lowest levels among those with the highest African ancestry. Associations for SNPs differed by race. Among AAs, VDR SNP rs2239186, associated with higher serum levels of 25OHD, decreased risk after correction for multiple testing (OR = 0.53, 95% CI = 0.31-0.79, p by permutation = 0.03), but had no effect in EAs. The majority of associations were for ER-negative breast cancer, with seven differential associations between AA and EA women for CYP24A1 (p for interaction < 0.10). SNP rs27622941 was associated with a > twofold increased risk of ER-negative breast cancer among AAs (OR = 2.62, 95% CI = 1.38-4.98), but had no effect in EAs. rs2209314 decreased risk among EAs (OR = 0.38, 95% CI = 0.20-0.73), with no associations in AAs. The increased risk of ER-negative breast cancer in AAs compared to EAs was reduced and became non-significant (OR = 1.20, 95% CI = 0.80-1.79) after adjusting for these two CYP24A1 SNPs.

Conclusions

These data suggest that genetic variants in the vitamin D pathway may be related to the higher prevalence of ER-negative breast cancer in AA women.
Appendix
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Metadata
Title
Variants in the vitamin D pathway, serum levels of vitamin D, and estrogen receptor negative breast cancer among African-American women: a case-control study
Authors
Song Yao
Gary Zirpoli
Dana H Bovbjerg
Lina Jandorf
Chi Chen Hong
Hua Zhao
Lara E Sucheston
Li Tang
Michelle Roberts
Gregory Ciupak
Warren Davis
Helena Hwang
Candace S Johnson
Donald L Trump
Susan E McCann
Foluso Ademuyiwa
Karen S Pawlish
Elisa V Bandera
Christine B Ambrosone
Publication date
01-04-2012
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 2/2012
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/bcr3162

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