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Cancer Epidemiol Biomarkers Prev. 2014 Apr;23(4):575-83. doi: 10.1158/1055-9965.EPI-13-1162. Epub 2014 Feb 3.

Better postdiagnosis diet quality is associated with reduced risk of death among postmenopausal women with invasive breast cancer in the women's health initiative.

Author information

1
Authors' Affiliations: Applied Research Program, Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, Maryland; Division of Preventive Medicine, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama; Division of Research, Kaiser Permanente of Northern California, Oakland, California; Department of Social and Preventive Medicine, School of Public Health and Health Professions, University at Buffalo, Buffalo, New York; Wake Forest School of Medicine, Division of Public Health Sciences, Winston-Salem, North Carolina; and Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington.

Abstract

BACKGROUND:

Few studies have evaluated whether adherence to dietary recommendations is associated with mortality among cancer survivors. In breast cancer survivors, we examined how postdiagnosis Healthy Eating Index (HEI)-2005 scores were associated with all-cause and cause-specific mortality.

METHODS:

Our prospective cohort study included 2,317 postmenopausal women, ages 50 to 79 years, in the Women's Health Initiative's Dietary Modification Trial (n = 1,205) and Observational Study (n = 1,112), who were diagnosed with invasive breast cancer and completed a food frequency questionnaire after being diagnosed. We followed women from this assessment forward. We used Cox proportional hazards models to estimate multivariate-adjusted HRs and 95% confidence intervals (CI) for death from any cause, breast cancer, and causes other than breast cancer, according to HEI-2005 quintiles.

RESULTS:

Over 9.6 years, 415 deaths occurred. After adjustment for key covariates, women consuming better quality diets had a 26% lower risk of death from any cause (HRQ4:Q1, 0.74; 95% CI, 0.55-0.99; Ptrend = 0.043) and a 42% lower risk of death from non-breast cancer causes (HRQ4:Q1, 0.58; 95% CI, 0.38-0.87; Ptrend = 0.011). HEI-2005 score was not associated with breast cancer death (HRQ4:Q1, 0.91; 95% CI, 0.60-1.40; Ptrend = 0.627). In analyses stratified by tumor estrogen receptor (ER) status, better diet quality was associated with a reduced risk of all-cause mortality among women with ER(+) tumors (n = 1,758; HRQ4:Q1, 0.55; 95% CI, 0.38-0.79; Ptrend = 0.0009).

CONCLUSION:

Better postdiagnosis diet quality was associated with reduced risk of death, particularly from non-breast cancer causes.

IMPACT:

Breast cancer survivors may experience improved survival by adhering to U.S. dietary guidelines.

PMID:
24493629
PMCID:
PMC4091724
DOI:
10.1158/1055-9965.EPI-13-1162
[Indexed for MEDLINE]
Free PMC Article

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