{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T22:08:42Z","timestamp":1791497322386,"version":"4.3.4"},"reference-count":27,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2022,8,9]],"date-time":"2022-08-09T00:00:00Z","timestamp":1660003200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Cancer Reports"],"published-print":{"date-parts":[[2023,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>Higher body mass index (BMI) is associated with worse prognosis in pre\u2010 and postmenopausal patients with breast cancer (BC). However, there is insufficient evidence regarding the optimal adjuvant endocrine therapy for obese premenopausal women with hormone receptor (HR)\u2010positive BC.<\/jats:p><\/jats:sec><jats:sec><jats:title>Aim<\/jats:title><jats:p>To evaluate the impact of obesity and adjuvant endocrine therapy on prognosis in premenopausal patients with BC.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods and results<\/jats:title><jats:p>We retrospectively reviewed the medical record of premenopausal women who received curative surgery for clinical stage I\u2013III HR\u2010positive BC from 2007 to 2017. Patients were classified into five groups according to BMI: underweight (UW), normal weight (NW), obese 1 degree (OB1), obese 2 degree (OB2), and obese 3 degree (OB3) categories. The primary analysis was a comparison of BC\u2010specific survival (BCSS) according to BMI (UW\/NW vs. OB1\u20133) and adjuvant endocrine therapy (with or without ovarian function suppression [OFS]).<\/jats:p><jats:p>Of 13\u2009021 patients, the data of 3380 patients were analyzed. BCSS in OB1\u20133 patients was significantly worse than that in patients with UW\/NW (hazard ratio [HR] 2.37; 95% confidence interval [CI], 1.40\u20134.02: <jats:italic>p<\/jats:italic>\u00a0=\u00a0.0009). In OB1\u20133 patients who received tamoxifen (TAM), BCSS was significantly worse than that in UW\/NW patients (<jats:italic>p<\/jats:italic>\u00a0=\u00a0.0086); however, a significant difference was not shown in patients who received TAM and OFS (<jats:italic>p<\/jats:italic>\u00a0=\u00a0.0921).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>High BMI was associated with worse prognosis in premenopausal patients with HR\u2010positive BC who received adjuvant TAM. The role of OFS as adjuvant endocrine therapy remains unclear, and further studies are required to explore the adequate management of obese premenopausal patients.<\/jats:p><\/jats:sec>","DOI":"10.1002\/cnr2.1695","type":"journal-article","created":{"date-parts":[[2022,8,10]],"date-time":"2022-08-10T03:29:21Z","timestamp":1660102161000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["The impact of obesity and endocrine therapy on the prognosis of premenopausal women with hormone receptor\u2010positive breast cancer: A single\u2010institute retrospective study"],"prefix":"10.1002","volume":"6","author":[{"given":"Yukinori","family":"Ozaki","sequence":"first","affiliation":[{"name":"Breast Oncology Center The Cancer Institute Hospital of JFCR  Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun","family":"Masuda","sequence":"additional","affiliation":[{"name":"Breast Oncology Center The Cancer Institute Hospital of JFCR  Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3156-2474","authenticated-orcid":false,"given":"Akemi","family":"Kataoka","sequence":"additional","affiliation":[{"name":"Breast Oncology Center The Cancer Institute Hospital of JFCR  Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takahiro","family":"Kogawa","sequence":"additional","affiliation":[{"name":"Division of Early Clinical Development for Cancer, Advanced Medical Development Center The Cancer Institute Hospital of JFCR  Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tomomi","family":"Abe","sequence":"additional","affiliation":[{"name":"Breast Oncology Center The Cancer Institute Hospital of JFCR  Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hidetomo","family":"Morizono","sequence":"additional","affiliation":[{"name":"Breast Oncology Center The 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