Real-world data for a CDK4/6 inhibitor, palbociclib, as 1st- or 2nd-line therapy in HR+/HER2- metastatic breast cancer: a multicenter prospective cohort study.

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Title: Real-world data for a CDK4/6 inhibitor, palbociclib, as 1st- or 2nd-line therapy in HR+/HER2- metastatic breast cancer: a multicenter prospective cohort study.
Authors: Ishikawa T; Department of Breast Surgical Oncology, Tokyo Medical University, Tokyo, Japan. tishik55@gmail.com., Uemura Y; Biostatistics Section, Department of Data Science, Center for Clinical Sciences, Japan Institute for Health Security, Tokyo, Japan., Seki H; Department of Breast Surgery, NHO Tokyo Medical Center, Tokyo, Japan., Kitada M; Department of Breast Disease Center, Asahikawa Medical University Hospital, Asahikawa, Hokkaido, Japan., Saito T; Department of Breast Surgery, Saitama Red Cross Hospital, Saitama, Japan., Yamada K; Department of Breast Surgical Oncology, Tokyo Medical University, Tokyo, Japan., Takao S; Department of Breast Surgery, Konan Medical Center, Kobe, Hyogo, Japan., Takabatake D; Department of Breast Surgery, NHO Shikoku Cancer Center, Matsuyama, Ehime, Japan., Yokota T; Department of Breast and Endocrine Surgery, NHO Shibukawa Medical Center, Shibukawa, Gunma, Japan., Kitahara M; Department of Breast Surgery, Ibaraki Prefectural Center Hospital and Cancer Center, Ibaraki, Japan., Kikawa Y; Department of Breast Surgery, Kansai Medical University, Osaka, Japan., Yamada A; Department of Breast Surgery, Yokohama City University Hospital, Kanagawa, Kanagawa, Japan., Toh U; Department of Surgery, Kurume University School of Medicine, Fukuoka, Japan., Nishimura H; Department of Breast Surgery, Nagano Municipal Hospital, Nagano, Japan., Kaise H; Department of Breast Surgical Oncology, Tokyo Medical University, Tokyo, Japan., Yamagami K; Department of Breast Surgery, Shinko Hospital, Kobe, Hyogo, Japan., Nishimura R; Department of Breast Surgery, Sagara Hospital Miyazaki, Miyazaki, Japan., Taira N; Department of Breast and Thyroid Surgery, Kawasaki Medical University, Okayama, Japan., Narui K; Department of Breast and Thyroid Surgery, Yokohama City University Medical Center, Yokohama, Kanagawa, Japan., Mukai H; Department of Medical Oncology, National Cancer Center Hospital East, Chiba, Japan.
Source: Breast cancer research : BCR [Breast Cancer Res] 2026 May 29. Date of Electronic Publication: 2026 May 29.
Publication Type: Journal Article
Journal Info: Publisher: BioMed Central Ltd Country of Publication: England NLM ID: 100927353 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1465-542X (Electronic) Linking ISSN: 14655411 NLM ISO Abbreviation: Breast Cancer Res Subsets: MEDLINE
Database: MEDLINE Ultimate
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ISSN:1465-542X
DOI:10.1186/s13058-026-02313-9