Cited by 630Cancer Risks and FactorsObesity, Physical Activity, DietMenopause: Health Impacts and Treatments

Overweight, Obesity, and Postmenopausal Invasive Breast Cancer Risk: A Secondary Analysis of the Women’s Health Initiative Randomized Clinical Trials

Open access
Neuhouser, Marian L., Aragaki, Aaron K., Prentice, Ross L., Manson, JoAnn E., Chlebowski, Rowan, Carty, Cara L., Ochs-Balcom, Heather M., Thomson, Cynthia A. +5 more·2015·JAMA Oncology

Abstract

IMPORTANCE: More than two-thirds of US women are overweight or obese, placing them at increased risk for postmenopausal breast cancer. OBJECTIVE: To investigate in this secondary analysis the associations of overweight and obesity with risk of postmenopausal invasive breast cancer after extended follow-up in the Women's Health Initiative (WHI) clinical trials. DESIGN, SETTING, AND PARTICIPANTS: The WHI clinical trial protocol incorporated measured height and weight, baseline and annual or biennial mammography, and adjudicated breast cancer end points in 67 142 postmenopausal women ages 50 to 79 years at 40 US clinical centers. The women were enrolled from 1993 to 1998 with a median of 13 years of follow-up through 2010; 3388 invasive breast cancers were observed. MAIN OUTCOMES AND MEASURES: Height and weight were measured at baseline, and weight was measured annually thereafter. Data were collected on demographic characteristics, personal and family medical history, and personal habits (smoking, physical activity). Women underwent annual or biennial mammograms. Breast cancers were verified by medical records reviewed by physician adjudicators. RESULTS: Women who were overweight and obese had an increased invasive breast cancer risk vs women of normal weight. Risk was greatest for obesity grade 2 plus 3 (body mass index [BMI], calculated as weight in kilograms divided by height in meters squared, >35.0) (hazard ratio [HR] for invasive breast cancer, 1.58; 95% CI, 1.40-1.79). A BMI of 35.0 or higher was strongly associated with risk for estrogen receptor-positive and progesterone receptor-positive breast cancers (HR, 1.86; 95% CI, 1.60-2.17) but was not associated with estrogen receptor-negative cancers. Obesity grade 2 plus 3 was also associated with advanced disease, including larger tumor size (HR, 2.12; 95% CI, 1.67-2.69; P = .02), positive lymph nodes (HR, 1.89; 95% CI, 1.46-2.45; P = .06), regional and/or distant stage (HR, 1.94; 95% CI, 1.52-2.47; P = .05), and deaths after breast cancer (HR, 2.11; 95% CI, 1.57-2.84; P < .001). Women with a baseline BMI of less than 25.0 who gained more than 5% of body weight over the follow-up period had an increased breast cancer risk (HR, 1.36; 95% CI, 1.1-1.65), but among women already overweight or obese we found no association of weight change (gain or loss) with breast cancer during follow-up. There was no effect modification of the BMI-breast cancer relationship by postmenopausal hormone therapy, and the direction of association across BMI categories was similar for never, past, and current hormone therapy use. CONCLUSIONS AND RELEVANCE: Obesity is associated with increased invasive breast cancer risk in postmenopausal women. These clinically meaningful findings should motivate programs for obesity prevention. TRIAL REGISTRATION: clinicaltrials.gov Identifier: NCT00000611.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1001/jamaoncol.2015.1546

Cites

48 of 48 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Resveratrol, selenium, and vitamin D have mixed effects on glycemic control and other cardiovascular risk factors.

    “Other nutritional supplements, specifically resveratrol, selenium, and vitamin D, have mixed effects on glycemic control and other CV risk factors.1705,1717–1724”

    From American Association of Clinical Endocrinology Clinical Practice Guideline: Developing a Diabetes Mellitus Comprehensive Care Plan-2022 Update. (2022) · cites this paper as [1722]

    The Methods describe a calcium-plus-vitamin-D trial, but do not report effects on glycemic control or cardiovascular risk factors. Searches for resveratrol, selenium, glycemic control, and related cardiovascular effects found no passage addressing the claim in our copy. (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • Some reports suggest potential harm from using resveratrol, selenium, and vitamin D.

    “Some reports suggest potential harm with the use of these agents.”

    From American Association of Clinical Endocrinology Clinical Practice Guideline: Developing a Diabetes Mellitus Comprehensive Care Plan-2022 Update. (2022) · cites this paper as [1722]

    The Methods section mentions vitamin D only as part of a calcium-plus-vitamin-D trial; it does not report harm from its use. Searches for resveratrol, selenium, and adverse effects found no passage in our copy addressing the claimed potential harm. (LLM, conf=0.75)

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Neuhouser, M. L., Aragaki, A. K., Prentice, R. L., Manson, J. E., Chlebowski, R., Carty, C. L., Ochs-Balcom, H. M., Thomson, C. A., Caan, B. J., Tinker, L. F., Urrutia, R. P., Knudtson, J., & Anderson, G. L.
Affiliations
  • Fred Hutch Cancer Center (US)
  • Brigham and Women's Hospital (US)
  • University of California, Los Angeles (US)
  • George Washington University (US)
  • Department of Epidemiology and Environmental Health, University at Buffalo, Buffalo, New York
  • University of Arizona (US)
  • Kaiser Permanente (US)
  • University of North Carolina at Chapel Hill (US)
  • The University of Texas at San Antonio Health Science Center (US)
Venue
JAMA Oncology
Published
2015-08-01
Volume
1
Issue
5
Pages
611
ISSN
2374-2437 (ISSN-L)
OpenAlex
W2113493868
Cited by
630
References
48
Citations by year
2026: 40 · 2025: 56 · 2024: 58 · 2023: 64 · 2022: 80 · 2021: 77 · 2020: 66 · 2019: 65 · 2018: 47 · 2017: 36 · 2016: 30 · 2015: 9
FWCI
17.76
Type
journal article
Language
en
Open access
Locations
  • JAMA Oncology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (HHSN268201100004C, HHSN268201100001C, HHSN268201100002C, HHSN268201100003C)
  • National Institute on Aging (HHSN-271-2011-00004C,)
  • National Heart, Lung, and Blood Institute (HHSN2682011-00001I, HHSN2682011-00002I, HHSN2682011‐00004I, HHSN268201100046C, HHSN2682011-00003I)
  • National Cancer Institute (K07CA136969)
Topics
  • Health Sciences › Medicine › Oncology › Cancer Risks and Factors
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Obesity, Physical Activity, Diet
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Menopause: Health Impacts and Treatments
Keywords
obesity, overweight, body mass index, estrogen receptor-positive breast cancer, progesterone receptor-positive breast cancer, tumor size, lymph node metastasis, breast cancer stage at diagnosis, breast cancer mortality, Women's Health Initiative, postmenopausal women, cancer risk factors, physical activity, smoking, hormone replacement therapy, mammography
MeSH terms
Aged, Breast Neoplasms, Female, Humans, Life Style, Mammography, Middle Aged, Neoplasm Invasiveness, Obesity, Prognosis, Risk Factors, Time Factors, United States, Weight Gain, Body Mass Index, Incidence, Multivariate Analysis, Proportional Hazards Models, Postmenopause, Risk Assessment, Overweight

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review