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Erschienen in: Breast Cancer Research and Treatment 1/2017

06.06.2017 | Epidemiology

Lifetime moderate-to-vigorous physical activity and ER/PR/HER-defined post-menopausal breast cancer risk

verfasst von: Joy Shi, Lindsay C. Kobayashi, Anne Grundy, Harriet Richardson, Sandip K. SenGupta, Caroline A. Lohrisch, John J. Spinelli, Kristan J. Aronson

Erschienen in: Breast Cancer Research and Treatment | Ausgabe 1/2017

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Abstract

Purpose

To assess the relationship of moderate-to-vigorous physical activity (MVPA) in leisure-time, household, and occupational domains across the total lifetime and in four age periods with breast cancer risk, as defined by estrogen receptor (ER)/progesterone receptor (PR) status and ER/PR/human epidermal growth factor-2 (HER2) status, among post-menopausal women.

Methods

Data were from 692 women with incident breast cancer and 644 controls in the Canadian Breast Cancer Study, a case–control study of women aged 40–80 years in British Columbia and Ontario. Mean metabolic equivalent (MET)-hours/week for questionnaire-assessed leisure-time, household, and occupational MVPA were calculated for the total lifetime and four age periods (12–17, 18–34, 45–49, and ≥50 years). Odds ratios (ORs) for the relationships between domain-specific MVPA at each lifetime period and risks of ER/PR-defined and ER/PR/HER2-defined breast cancers were estimated using polytomous logistic regression. Trend tests for dose–response relationships were calculated for the ORs across increasing tertiles of mean MET-hours/week of MVPA.

Results

Total lifetime leisure-time MVPA was associated with reduced risk of ER−/PR− breast cancer in a dose–response fashion (p trend = 0.014). In contrast, total lifetime household MVPA was associated with reduced risk of ER+ and/or PR+ breast cancer (p trend < 0.001). When further stratified by HER2 status, the effect of leisure-time MVPA appeared confined to HER2− breast cancers, and the effect of household MVPA did not differ according to HER2 status. Similar trends were observed when stratified by age period.

Conclusions

Lifetime leisure-time MVPA appeared to be associated with reduced risk of ER−/PR−/HER2− breast cancers and lifetime household MVPA was associated with reduced risk of ER+ and/or PR+ breast cancer, regardless of HER2 status.
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Metadaten
Titel
Lifetime moderate-to-vigorous physical activity and ER/PR/HER-defined post-menopausal breast cancer risk
verfasst von
Joy Shi
Lindsay C. Kobayashi
Anne Grundy
Harriet Richardson
Sandip K. SenGupta
Caroline A. Lohrisch
John J. Spinelli
Kristan J. Aronson
Publikationsdatum
06.06.2017
Verlag
Springer US
Erschienen in
Breast Cancer Research and Treatment / Ausgabe 1/2017
Print ISSN: 0167-6806
Elektronische ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-017-4323-4

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