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JAMA Oncol. 2018 Oct 1;4(10):e181212. doi: 10.1001/jamaoncol.2018.1212. Epub 2018 Oct 11.

Association of Low-Fat Dietary Pattern With Breast Cancer Overall Survival: A Secondary Analysis of the Women's Health Initiative Randomized Clinical Trial.

Author information

1
City of Hope National Medical Center, Department of Medical Oncology and Therapeutics Research, Duarte, California.
2
Fred Hutchinson Cancer Research Center, Division of Public Health Sciences, Seattle, Washington.
3
Wayne State University, Karmanos Cancer Institute, Detroit, Michigan.
4
Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
5
Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Department of Medicine, Torrance, California.
6
Stanford Prevention Research Center, School of Medicine, Stanford University, Palo Alto, California.
7
Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, New York.
8
Stony Brook University, Preventive Medicine, Stony Brook, New York.
9
Department of Public Health Sciences, University of California at Davis.
10
College of Public Health, University of Iowa, Iowa City/Davenport.

Abstract

Importance:

In a randomized clinical trial, a low-fat eating pattern was associated with lower risk of death after breast cancer. However, the extent to which results were driven by dietary influence on survival after breast cancer diagnosis was unknown.

Objective:

To determine the association of a low-fat dietary pattern with breast cancer overall survival (breast cancer followed by death from any cause measured from cancer diagnosis).

Design, Setting, and Participants:

This is a secondary analysis of the Women's Health Initiative randomized clinical trial that was conducted at 40 US clinical centers enrolling participants from 1993 through 1998. Participants were 48 835 postmenopausal women with no previous breast cancer and dietary fat intake of greater than 32% by food frequency questionnaire.

Interventions:

Participants were randomized to a dietary intervention group (40%; n = 19 541) with goals to reduce fat intake to 20% of energy and increase fruit, vegetable, and grain intake or a usual-diet comparison group (60%; n = 29 294). Dietary group participants with incident breast cancers continued to participate in subsequent dietary intervention activities.

Main Outcomes and Measures:

Breast cancer overall survival for incident breast cancers diagnosed during the 8.5-year (median) dietary intervention, examined in post hoc analyses after 11.5 years (median) postdiagnosis follow-up.

Results:

Of 1764 women diagnosed with breast cancer during the dietary intervention period, mean (SD) age at screening was 62.7 (6.7) years and age at diagnosis was 67.6 (6.9) years. With 516 total deaths, breast cancer overall survival was significantly greater for women in the dietary intervention group than in the usual-diet comparison group (10-year survival of 82% and 78%, respectively; hazard ratio [HR], 0.78; 95% CI, 0.65-0.94; P = .01). In the dietary group there were fewer deaths from breast cancer (68 vs 120; HR, 0.86; 95% CI, 0.64-1.17), other cancers (36 vs 65; HR, 0.76; 95% CI, 0.50-1.17), and cardiovascular disease (27 vs 64; HR, 0.62; 95% CI, 0.39-0.99).

Conclusions and Relevance:

In women who received a diagnosis of breast cancer during the dietary intervention period, those in the dietary group had increased overall survival. The increase is due, in part, to better survival from several causes of death.

Trial Registration:

ClinicalTrials.gov Identifier: NCT00000611.

PMID:
29800122
PMCID:
PMC6233778
[Available on 2019-05-24]
DOI:
10.1001/jamaoncol.2018.1212

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