Ethnic differences in the relationships between diabetes, early age adiposity and mortality among breast cancer survivors: the Breast Cancer Health Disparities Study

Avonne Connor, Kala Visvanathan, Kathy B. Baumgartner, Richard N. Baumgartner, Stephanie D. Boone, Lisa M. Hines, Roger K. Wolff, Esther M. John, Martha L. Slattery

Research output: Contribution to journalArticle

Abstract

The contribution of type 2 diabetes and obesity on mortality in breast cancer (BC) patients has not been well studied among Hispanic women, in whom these exposures are highly prevalent. In a multi-center population-based study, we examined the associations between diabetes, multiple obesity measures, and mortality in 1180 Hispanic and 1298 non-Hispanic white (NHW) women who were diagnosed with incident invasive BC from the San Francisco Bay Area, New Mexico, Utah, Colorado, and Arizona. Adjusted hazard ratios (HR) and 95 % confidence intervals (CI) were calculated using Cox proportional hazards regression models. The median follow-up time from BC diagnosis to death was 10.8 years. In ethnic-stratified results, the association for BC-specific mortality among Hispanics was significantly increased (HR 1.85 95 % CI 1.11, 3.09), but the ethnic interaction was not statistically significant. In contrast, obesity at age 30 increased BC-specific mortality risk in NHW women (HR 2.33 95 % CI 1.36, 3.97) but not Hispanics (p-interaction = 0.045). Although there were no ethnic differences for all-cause mortality, diabetes, obesity at age 30, and post-diagnostic waist-hip ratio were significantly associated with all-cause mortality in all women. This study provides evidence that diabetes and adiposity, both modifiable, are prognostic factors among Hispanic and NHW BC patients.

Original languageEnglish (US)
Pages (from-to)167-178
Number of pages12
JournalBreast Cancer Research and Treatment
Volume157
Issue number1
DOIs
StatePublished - May 1 2016

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Keywords

  • Breast cancer
  • Diabetes
  • Hispanics
  • Obesity
  • Survival

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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