TY - JOUR
T1 - Overweight, obesity, and postmenopausal invasive breast cancer risk
T2 - A secondary analysis of the women's health initiative randomized clinical trials
AU - Neuhouser, Marian L.
AU - Aragaki, Aaron K.
AU - Prentice, Ross L.
AU - Manson, Jo Ann E.
AU - Chlebowski, Rowan
AU - Carty, Cara L.
AU - Ochs-Balcom, Heather M.
AU - Thomson, Cynthia A.
AU - Caan, Bette J.
AU - Tinker, Lesley F.
AU - Urrutia, Rachel Peragallo
AU - Knudtson, Jennifer
AU - Anderson, Garnet L.
N1 - Publisher Copyright:
Copyright © 2015 American Medical Association. All rights reserved.
PY - 2015/8
Y1 - 2015/8
N2 - 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 andweightwere measured at baseline, andweight 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.
AB - 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 andweightwere measured at baseline, andweight 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.
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U2 - 10.1001/jamaoncol.2015.1546
DO - 10.1001/jamaoncol.2015.1546
M3 - Article
C2 - 26182172
AN - SCOPUS:85010767334
SN - 2374-2437
VL - 1
SP - 611
EP - 621
JO - JAMA Oncology
JF - JAMA Oncology
IS - 5
ER -