{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,28]],"date-time":"2026-10-28T08:12:01Z","timestamp":1793175121123,"version":"4.5.0"},"reference-count":51,"publisher":"American Medical Association (AMA)","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JAMA Netw Open"],"abstract":"<jats:sec id=\"ab-zoi240218-4\"><jats:title>Objective<\/jats:title><jats:p>To investigate the association between body composition parameters and breast cancer (BC) risk in premenopausal women.<\/jats:p><\/jats:sec><jats:sec id=\"ab-zoi240218-5\"><jats:title>Design, Setting, and Participants<\/jats:title><jats:p>Prospective cohort study using data from the Kangbuk Samsung Cohort Study. Participants were women aged 20 to 54 years who were enrolled from 2011 to 2019 and followed up for BC development until December 31, 2020. Data were analyzed from June to August 2023.<\/jats:p><\/jats:sec><jats:sec id=\"ab-zoi240218-6\"><jats:title>Exposures<\/jats:title><jats:p>Trained nurses conducted anthropometric measurements and assessed body composition using segmental bioelectric impedance analysis. The analysis encompassed adiposity measures such as body mass index (BMI), waist circumference, and body composition parameters, including muscle mass, fat mass, ratio of muscle mass to weight, ratio of fat mass to weight, and fat mass index.<\/jats:p><\/jats:sec><jats:sec id=\"ab-zoi240218-7\"><jats:title>Main outcomes and measures<\/jats:title><jats:p>Adjusted hazard ratios (aHR) for BC during the follow-up period.<\/jats:p><\/jats:sec><jats:sec id=\"ab-zoi240218-8\"><jats:title>Results<\/jats:title><jats:p>Among 125\u202f188 premenopausal women, the mean (SD) age was 34.9 (6.3) years. During a mean (range) follow-up of 6.7 (0.5-9.9) years, 1110 incident BC cases were identified. The mean (SD) BMI and waist circumference were 21.6 (3.1) and 75.3 (8.2) cm, respectively. Higher BMI and waist circumference were associated with decreased risk, with an aHR of 0.89 (95% CI, 0.84-0.95) per SD increase in BMI and 0.92 (95% CI, 0.86-0.98) per SD increase in waist circumference. A higher ratio of fat mass to weight was associated with decreased BC risk (aHR, 0.92; 95% CI, 0.86-0.99 per SD increase), whereas the opposite trend was observed for the ratio of muscle mass to weight, with an aHR of 1.08 (95% CI, 1.02-1.15) per SD increase. The results remained consistent even after additional adjustments for height in the model. The fat mass index was also inversely associated with BC risk, with an HR of 0.90 (95% CI, 0.85-0.97) per SD increase.<\/jats:p><\/jats:sec><jats:sec id=\"ab-zoi240218-9\"><jats:title>Conclusions and Relevance<\/jats:title><jats:p>In this cohort study of premenopausal women, a higher level of adiposity, represented by increased BMI, waist circumference, and fat mass, was consistently associated with decreased breast cancer risk. Conversely, muscle mass and its ratio to weight displayed opposite or inconsistent patterns. These findings suggest an inverse association between excess adiposity and the risk of BC in premenopausal women, confirming earlier findings that BMI is an indirect measure of adiposity.<\/jats:p><\/jats:sec>","DOI":"10.1001\/jamanetworkopen.2024.5423","type":"journal-article","created":{"date-parts":[[2024,4,5]],"date-time":"2024-04-05T15:31:18Z","timestamp":1712331078000},"page":"e245423","source":"Crossref","is-referenced-by-count":21,"title":["Adiposity, Body Composition Measures, and Breast Cancer Risk in Korean Premenopausal Women"],"prefix":"10.1001","volume":"7","author":[{"given":"Thi Xuan Mai","family":"Tran","sequence":"first","affiliation":[{"name":"Department of Preventive Medicine, Hanyang University College of Medicine, Seoul, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yoosoo","family":"Chang","sequence":"additional","affiliation":[{"name":"Center for Cohort Studies, Kangbuk Samsung Hospital, Sungkyunkwan University School of 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