NDLI: Does hormone therapy counter the beneficial effects of physical activity on breast cancer risk in postmenopausal women?

Content Provider	Springer Nature Link
Author	Dieli Conwright, Christina M. Sullivan Halley, Jane Patel, Alpa Press, Michael Malone, Kathleen Ursin, Giske Burkman, Ronald Strom, Brian Simon, Michael Weiss, Linda Marchbanks, Polly Folger, Suzanne Spirtas, Robert Deapen, Dennis Bernstein, Leslie
Copyright Year	2011
Abstract	Studies consistently demonstrate that physical activity is inversely associated with postmenopausal breast cancer. Whether this association is stronger among non-hormone users or former users of menopausal hormone therapy (HT) is of interest given the marked decline in HT use since 2002. The Women’s Contraceptive and Reproductive Experiences Study, a population-based case–control study of invasive breast cancer, recruited white women and black women ages 35–64 years and collected histories of lifetime recreational physical activity and HT use including estrogen-alone therapy (ET) and estrogen plus progestin therapy (EPT). Among postmenopausal women (1,908 cases, 2,013 control participants), breast cancer risk declined with increasing levels of lifetime physical activity among never HT users; among short-term HT users (fewer than 5 years); and among current ET users; P trend values ranged from 0.004 to 0.016. In contrast, physical activity had no significant association with risk among long-term and past HT users and among current EPT users. No statistical evidence of heterogeneity was demonstrated for duration or currency of HT use. Breast cancer risk decreases with increasing lifetime physical activity levels among postmenopausal women who have not used HT, have used HT for less than 5 years, or are current ET users, yet this study was unable to demonstrate statistically that HT use modifies the relationship between physical activity and breast cancer. With profound changes in HT use occurring since 2002, it will be important in future studies to learn whether or not any association between physical activity and breast cancer among former HT users is a function of time since last HT use.
Starting Page	515
Ending Page	522
Page Count	8
File Format	PDF
ISSN	09575243
Journal	Cancer Causes & Control
Volume Number	22
Issue Number	3
e-ISSN	15737225
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-01-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hormone therapy Physical activity Breast cancer Public Health/Gesundheitswesen Cancer Research Hematology Epidemiology Oncology Biomedicine general
Content Type	Text
Resource Type	Article
Subject	Cancer Research Oncology

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