Overweight, Obesity, and Postmenopausal Invasive Breast Cancer Risk: A Secondary Analysis of the Women's Health Initiative Randomized Clinical Trials.
Overweight, Obesity, and Postmenopausal Invasive Breast Cancer Risk: A Secondary Analysis of the Women's Health Initiative Randomized Clinical Trials.
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DOI:
10.1001/jamaoncol.2015.1546
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发表时间:
2015-08
期刊:
影响因子:
28.4
通讯作者:
Anderson, Garnet L.
中科院分区:
文献类型:
--
作者:
Neuhouser, Marian L.;Aragaki, Aaron K.;Prentice, Ross L.;Manson, JoAnn E.;Chlebowski, Rowan;Carty, Cara L.;Ochs-Balcom, Heather M.;Thomson, Cynthia A.;Caan, Bette J.;Tinker, Lesley F.;Urrutia, Rachel Peragallo;Knudtson, Jennifer;Anderson, Garnet L.
Over ⅔ of U.S. women are overweight or obese, placing them at increased risk for postmenopausal breast cancer. To investigate 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 Trial. The WHI protocol incorporated measured height and weight, baseline and annual or biennial mammography, and adjudicated breast cancer endpoints. 40 U.S. clinical centers. n=67,142 postmenopausal women aged 50–79 years were enrolled from 1993–1998 with a median of 13 years of follow-up through 2010; 3388 invasive breast cancers were observed. 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. Women who were overweight and obese had an increased invasive breast cancer risk vs. normal weight women. Risk was greatest for obesity grades 2+3 (BMI>35.0 kg/m2) (hazard ratio [HR] for invasive breast cancer =1.58, 95% CI 1.40–1.79). BMI ≥ 35.0 kg/m2 was strongly associated with risk for ER+/PR+ breast cancers (HR=1.86 95% CI 1.60–2.17), but was not associated with ER− cancers. Obesity grade 2+3 was also associated with advanced disease including larger tumor size (HR=2.12 95%CI 1.67–2.69). (P=0.02), positive lymph nodes (HR=1.89 95%CI 1.46–2.45), (P=0.06), regional/distant stage (HR=1.94, 95%CI 1.52–2.47) (P=0.05) and deaths after breast cancer (HR=2.11 95%CI 1.57–2.84) (P<0.001). Women with baseline BMI<25.0 kg/m2 who gained >5% of bodyweight 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 (HT) and the direction of association across BMI categories was similar for never, past and current HT use. 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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DOI:
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发表时间:
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期刊:
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