{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T13:12:41Z","timestamp":1787058761060,"version":"build-2736575974"},"reference-count":40,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2024,12,17]],"date-time":"2024-12-17T00:00:00Z","timestamp":1734393600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2024,12,17]],"date-time":"2024-12-17T00:00:00Z","timestamp":1734393600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J cachexia sarcopenia muscle"],"published-print":{"date-parts":[[2025,2]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Recent evidence indicates that a dysregulated host metabolism influences treatment outcomes in patients with breast cancer. We investigated the association of computed tomography (CT)\u2010derived body composition indices with therapeutic responses in patients with hormone receptor\u2010positive, HER2\u2010negative advanced breast cancer (ABC) on endocrine plus CDK4\/6 inhibitor (CDK4\/6i) treatment.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>The study involved a retrospective cohort of patients with ABC at the Yonsei Cancer Center who received CDK4\/6i and aromatase inhibitors as first\u2010line therapy between January 2017 and October 2020. Body composition parameters were estimated from the non\u2010enhanced CT images of the third lumbar spine by commercialized deep learning software. Patients with low skeletal muscle radiodensity (SMD) were defined as patients with SMD of low tertile (\u2264\u200928.7 Hounsfield Units). The primary outcome was progression\u2010free survival (PFS).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Among the 247 female participants (median age, 53\u2009years; mean body mass index [BMI], 23.7\u2009kg\/m\n                      <jats:sup>2<\/jats:sup>\n                      ), 45.7% had disease progression or death during a median follow\u2010up of 36.4\u2009months. After adjusting for age and visceral metastasis, SMD was the only independent predictor among body composition parameters for worse PFS (adjusted hazard ratio [HR]\u2009=\u20091.20 per standard deviation decrement, 95% CI: 1.01\u20131.42,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.041), whereas BMI, muscle area, and fat area were not. Participants with low SMD had a higher risk of progression than those without (PFS, 27.2 vs. 51.1\u2009months,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.009; adjusted HR 1.84, 95% CI: 1.22\u20132.76,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.003). Strong associations between low SMD and poor PFS were observed in groups with pre\u2010menopause status (HR, 3.04 vs. 1.19 in post\u2010menopause; 95% CI: 1.54\u20135.99,\n                      <jats:italic>p<\/jats:italic>\n                      for interaction &lt;\u20090.05) and without visceral metastases (HR, 2.95 vs. 1.19 in with visceral metastases; 95% CI: 1.59\u20135.49,\n                      <jats:italic>p<\/jats:italic>\n                      for interaction &lt;\u20090.05).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>CT\u2010defined low SMD predicts poor treatment outcomes in patients with ABC undergoing first\u2010line treatment with aromatase inhibitors and CDK4\/6i.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/jcsm.13666","type":"journal-article","created":{"date-parts":[[2024,12,17]],"date-time":"2024-12-17T03:42:31Z","timestamp":1734406951000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Low Skeletal Muscle Radiodensity Predicts Response to CDK4\/6 Inhibitors Plus Aromatase Inhibitors in Advanced Breast Cancer"],"prefix":"10.1002","volume":"16","author":[{"given":"Hyunwook","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Internal Medicine, Division of Medical Oncology, Yonsei Cancer Center Yonsei University College of Medicine  Seoul South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seungjin","family":"Baek","sequence":"additional","affiliation":[{"name":"Department of Internal Medicine Yonsei University College of Medicine  Seoul South 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