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Published in: Breast Cancer Research and Treatment 3/2018

01-08-2018 | Epidemiology

An estrogen-related lifestyle score is associated with risk of postmenopausal breast cancer in the PLCO cohort

Authors: Mark A. Guinter, Alexander C. McLain, Anwar T. Merchant, Dale P. Sandler, Susan E. Steck

Published in: Breast Cancer Research and Treatment | Issue 3/2018

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Abstract

Purpose

Healthy or unhealthy lifestyle behaviors are often adopted together. We aimed to investigate the combined effect of estrogen-related lifestyle factors on postmenopausal breast cancer risk.

Methods

Data from 27,153 women enrolled in the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial were used. We created an estrogen-related lifestyle score (ERLS) by incorporating a previously developed measure of estrogenic diet, alcohol intake, body mass index (BMI), and physical activity. The scores ranged from 0 to 6 with alcohol and BMI accounting for higher weights than the other factors. To evaluate the preventive possibilities of a low estrogen-related lifestyle and to be consistent with other published lifestyle scores, higher scores were set to correspond with potentially lower estrogenic lifestyle. The association between the ERLS and incident breast cancer was examined using Cox proportional hazards models.

Results

Participants with an ERLS of 4 or ≥ 5 had a 23% (HR 0.77; 95% CI 0.67–0.89) and 34% (HR 0.66; 95% CI 0.56–0.78) lower risk of breast cancer, respectively, compared to those with an ERLS ≤ 2 after multivariable adjustment. Estimates were similar when restricting to invasive cases or estrogen receptor-positive subtypes. No single lifestyle component appeared to drive the association.

Conclusions

Our findings suggest that the combined effect of a lifestyle characterized by a low estrogenic diet, low alcohol consumption, low body weight, and high levels of physical activity are associated with a reduction in postmenopausal breast cancer risk, possibly through an influence on estrogen metabolism.
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Metadata
Title
An estrogen-related lifestyle score is associated with risk of postmenopausal breast cancer in the PLCO cohort
Authors
Mark A. Guinter
Alexander C. McLain
Anwar T. Merchant
Dale P. Sandler
Susan E. Steck
Publication date
01-08-2018
Publisher
Springer US
Published in
Breast Cancer Research and Treatment / Issue 3/2018
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-018-4784-0

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