Volume 130, Issue 4 pp. 902-909
Epidemiology

Adult weight change and incidence of premenopausal breast cancer

Karin B. Michels

Corresponding Author

Karin B. Michels

Department of Obstetrics, Gynecology and Reproductive Biology, Obstetrics and Gynecology Epidemiology Center, Brigham and Women's Hospital, Harvard Medical School, Boston, MA

Department of Medicine, Channing Laboratory, Brigham and Women's Hospital, Harvard Medical School, Boston, MA

Department of Epidemiology, Harvard School of Public Health, Boston, MA

Tel.: 617-732-8496, Fax: 617-732-4899

Obstetrics and Gynecology Epidemiology Center, Brigham and Women's Hospital, 221 Longwood Avenue, Boston, MA 02115, USASearch for more papers by this author
Kathryn L. Terry

Kathryn L. Terry

Department of Obstetrics, Gynecology and Reproductive Biology, Obstetrics and Gynecology Epidemiology Center, Brigham and Women's Hospital, Harvard Medical School, Boston, MA

Department of Medicine, Channing Laboratory, Brigham and Women's Hospital, Harvard Medical School, Boston, MA

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A. Heather Eliassen

A. Heather Eliassen

Department of Medicine, Channing Laboratory, Brigham and Women's Hospital, Harvard Medical School, Boston, MA

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Susan E. Hankinson

Susan E. Hankinson

Department of Medicine, Channing Laboratory, Brigham and Women's Hospital, Harvard Medical School, Boston, MA

Department of Epidemiology, Harvard School of Public Health, Boston, MA

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Walter C. Willett

Walter C. Willett

Department of Medicine, Channing Laboratory, Brigham and Women's Hospital, Harvard Medical School, Boston, MA

Department of Epidemiology, Harvard School of Public Health, Boston, MA

Department of Nutrition, Harvard School of Public Health, Boston, MA

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First published: 16 March 2011
Citations: 38

Abstract

Overweight and obesity are inversely related to the risk of breast cancer among premenopausal women. We assessed the association between adult weight change since age 18 years with the risk of breast cancer among premenopausal women to explore whether weight gain was associated with a decrease in risk and weight loss was associated with an increase in risk. A total of 56,223 premenopausal participants in the Nurses' Health Study and 109,385 premenopausal participants in the Nurses' Health Study II were prospectively followed for up to 32 years and 18 years, respectively, and weight change since age 18 years was assessed biennially. The incidence of invasive breast cancer was assessed throughout follow-up. Weight loss of 5 kg or more since age 18, maintained for at least 4 years, was related to lower incidence of premenopausal breast cancer, compared to maintaining a stable weight, but this relation was of borderline statistical significance (covariate-adjusted HR = 0.75; 95% CI 0.52–1.09). Weight gain since age 18 years was also inversely related to breast cancer incidence among premenopausal women (covariate-adjusted p for trend = 0.01), but the association weakened after controlling for weight at age 18 and did not reach statistical significance (p for trend = 0.08). Although obesity and breast cancer among premenopausal women are inversely related, weight loss since age 18 years did not increase and weight gain did not significantly decrease the risk of premenopausal breast cancer among participants in the large prospective cohorts of NHS and NHS II.

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