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The influence of genetic ancestry and ethnicity on breast cancer survival associated with genetic variation in the TGF-β-signaling pathway: The Breast Cancer Health Disparities Study.

Abstract
The TGF-β signaling pathway regulates cellular proliferation and differentiation. We evaluated genetic variation in this pathway, its association with breast cancer survival, and survival differences by genetic ancestry and self-reported ethnicity. The Breast Cancer Health Disparities Study includes participants from the 4-Corners Breast Cancer Study (n = 1,391 cases) and the San Francisco Bay Area Breast Cancer Study (n = 946 cases) who have been followed for survival. We evaluated 28 genes in the TGF-β signaling pathway using a tagSNP approach. Adaptive rank truncated product (ARTP) was used to test the gene and pathway significance by Native American (NA) ancestry and by self-reported ethnicity (non-Hispanic white (NHW) and Hispanic/NA). Genetic variation in the TGF-β signaling pathway was associated with overall breast cancer survival (P ARTP = 0.05), especially for women with low NA ancestry (P ARTP = 0.007) and NHW women (P ARTP = 0.006). BMP2, BMP4, RUNX1, and TGFBR3 were significantly associated with breast cancer survival overall (P ARTP = 0.04, 0.02, 0.002, and 0.04, respectively). Among women with low NA, ancestry associations were as follows: BMP4 (P ARTP = 0.007), BMP6 (P ARTP = 0.001), GDF10 (P ARTP = 0.05), RUNX1 (P ARTP = 0.002), SMAD1 (P ARTP = 0.05), and TGFBR2 (P ARTP = 0.02). A polygenic risk model showed that women with low NA ancestry and high numbers of at-risk alleles had twice the risk of dying from breast cancer as did women with high NA ancestry. Our data suggest that genetic variation in the TGF-β signaling pathway influences breast cancer survival. Associations were similar when the analyses were stratified by genetic ancestry or by self-reported ethnicity.
AuthorsMartha L Slattery, Abbie Lundgreen, Marianna C Stern, Lisa Hines, Roger K Wolff, Anna R Giuliano, Kathy B Baumgartner, Esther M John
JournalCancer causes & control : CCC (Cancer Causes Control) Vol. 25 Issue 3 Pg. 293-307 (Mar 2014) ISSN: 1573-7225 [Electronic] Netherlands
PMID24337772 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
Chemical References
  • DNA, Neoplasm
  • Transforming Growth Factor beta
Topics
  • Adult
  • Aged
  • Breast Neoplasms (genetics, mortality)
  • Case-Control Studies
  • DNA, Neoplasm (blood, genetics)
  • Female
  • Genetic Predisposition to Disease
  • Healthcare Disparities
  • Hispanic or Latino (genetics)
  • Humans
  • Middle Aged
  • Polymorphism, Single Nucleotide
  • San Francisco (epidemiology)
  • Signal Transduction (genetics)
  • Survival Analysis
  • Transforming Growth Factor beta (genetics, metabolism)
  • White People (genetics)

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