Adult weight change and premenopausal breast cancer risk: A prospective pooled analysis of data from 628,463 women
Journal Article
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· International Journal of Cancer
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- Division of Genetics and Epidemiology The Institute of Cancer Research London United Kingdom
- Department of Epidemiology University of North Carolina Gillings School of Global Public Health Chapel Hill NC
- Institute of Cancer Research, London (United Kingdom)
- Biostatistics and Computational Biology Branch National Institute of Environmental Health Sciences, National Institutes of Health Durham NC
- Department of Medical Epidemiology and Biostatistics (MEB) Karolinska Institutet Stockholm Sweden; Clinical Effectiveness Research Group Institute of Health and Society, University of Oslo Oslo Norway
- Department of Clinical and Experimental Medicine University of Pisa Pisa Italy
- Department of Population Sciences Beckman Research Institute of City of Hope Duarte CA
- Slone Epidemiology Center at Boston University Boston MA
- Department of Population Health and Perlmutter Cancer Center New York University School of Medicine New York NY
- Department of Epidemiology Johns Hopkins Bloomberg School of Public Health Baltimore MD; Johns Hopkins Sidney Kimmel Comprehensive Cancer Center Baltimore MD
- Nutrition and Metabolism Section International Agency for Research on Cancer Lyon France
- Department of Epidemiology Harvard T.H. Chan School of Public Health Boston MA; Channing Division of Network Medicine, Department of Medicine Brigham and Women's Hospital and Harvard Medical School Boston MA
- Cancer Epidemiology and Intelligence Division Cancer Council Victoria Melbourne VIC Australia; Centre for Epidemiology and Biostatistics School of Population and Global Health, The University of Melbourne Melbourne VIC Australia
- Department of Community Medicine, Faculty of Health Sciences University of Tromsø (UiT), The Arctic University of Norway Tromsø Norway
- Department of Biostatistics and Epidemiology School of Public Health and Health Sciences, University of Massachusetts Amherst MA
- Division of Cancer Epidemiology, DKFZ Heidelberg Germany
- Nuffield Department of Population Health University of Oxford Oxford United Kingdom
- Ontario Institute for Cancer Research Toronto ON Canada
- Radiation Epidemiology Branch, Division of Cancer Epidemiology and Genetics National Cancer Institute Bethesda MD
- Karolinska Institute, Institute of Environmental Medicine Stockholm Sweden
- Radiation Effects Research Foundation Hiroshima Japan
- School of Public Health Imperial College London United Kingdom
- Albert Einstein College of Medicine Bronx NY
- Unit of Cancer Epidemiology Città della Salute e della Scienza University‐Hospital and Center for Cancer Prevention (CPO) Turin Italy
- Department of Surgical and Perioperative Sciences Umeå University Umeå Sweden
- Hellenic Health Foundation Athens Greece
- Cancer Registry of Norway, Institute of Population‐Based Cancer Research Oslo Norway; Institute of Basic Medical Sciences, University of Oslo Oslo Norway; Department of Preventive Medicine University of Southern California Los Angeles CA
- Department of Epidemiology Johns Hopkins Bloomberg School of Public Health Baltimore MD; Johns Hopkins School of Medicine Baltimore MD
- International Agency for Research on Cancer (IARC)/World Health Organization (WHO) Lyon France
- Karolinska Institute, Institute of Environmental Medicine Stockholm Sweden; Department of Surgical Sciences Uppsala University Uppsala Sweden
- Epidemiology Branch National Institute of Environmental Health Sciences, National Institutes of Health Durham NC
- Division of Genetics and Epidemiology The Institute of Cancer Research London United Kingdom; Division of Breast Cancer Research The Institute of Cancer Research London United Kingdom
Early-adulthood body size is strongly inversely associated with risk of premenopausal breast cancer. It is unclear whether subsequent changes in weight affect risk. We pooled individual-level data from 17 prospective studies to investigate the association of weight change with premenopausal breast cancer risk, considering strata of initial weight, timing of weight change, other breast cancer risk factors and breast cancer subtype. Hazard ratios (HR) and 95% confidence intervals (CI) were obtained using Cox regression. Among 628,463 women, 10,886 were diagnosed with breast cancer before menopause. Models adjusted for initial weight at ages 18–24 years and other breast cancer risk factors showed that weight gain from ages 18–24 to 35–44 or to 45–54 years was inversely associated with breast cancer overall (e.g., HR per 5 kg to ages 45–54: 0.96, 95% CI: 0.95–0.98) and with oestrogen-receptor(ER)-positive breast cancer (HR per 5 kg to ages 45–54: 0.96, 95% CI: 0.94–0.98). Weight gain from ages 25–34 was inversely associated with ER-positive breast cancer only and weight gain from ages 35–44 was not associated with risk. None of these weight gains were associated with ER-negative breast cancer. Weight loss was not consistently associated with overall or ER-specific risk after adjusting for initial weight. Weight increase from early-adulthood to ages 45–54 years is associated with a reduced premenopausal breast cancer risk independently of early-adulthood weight. Biological explanations are needed to account for these two separate factors.
- Research Organization:
- University of North Carolina, Chapel Hill, NC (United States)
- Sponsoring Organization:
- USDOE
- Contributing Organization:
- National Cancer Institute Cohort Consortium
- OSTI ID:
- 1817172
- Journal Information:
- International Journal of Cancer, Journal Name: International Journal of Cancer Journal Issue: 5 Vol. 147; ISSN 0020-7136
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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