To understand the real-world use of abemaciclib in Japanese patients with early breast cancer (EBC). This retrospective observational study was conducted using a Japanese administrative claims database in patients with hormone receptor-positive, human epidermal growth factor receptor 2-negative EBC who received abemaciclib adjuvant therapy from December 2021-March 2023. Patient characteristics and treatment patterns were summarized. Among 374 patients, 38.2, 51.6 and 63.4% patients received neoadjuvant chemotherapy, adjuvant chemotherapy and radiotherapy, respectively; 13.1% were chemotherapy naive. Tamoxifen (37.7%), letrozole (35.6%), anastrozole (24.3%) were the commonly prescribed concomitant adjuvant endocrine therapies. Abemaciclib dose reductions were observed in 42.0% patients. Use of abemaciclib for treatment of high-risk EBC was described, which could help inform patient selection and treatment patterns.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11508998PMC
http://dx.doi.org/10.1080/14796694.2024.2346464DOI Listing

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