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Baek SK, Jeong JH, Jung K, Ahn HK, Kim MH, Sohn J, Park IH, Ahn JS, Lee DW, Im SA, Sim SH, Lee KS, Hyun Kim J, Shim HJ, Chae Y, Koh SJ, Lee H, Lee J, Byun JH, Seol Y, Lee EM, Jee HJ, An H, Park EB, Suh YJ, Lee KE, Park YH. A nationwide real-world study for evaluation of effectiveness and safety of T-DM1 in patients with HER2-positive metastatic breast cancer in Korea (KCSG BR19-15). Ther Adv Med Oncol 2024; 16:17588359231225029. [PMID: 38288157 PMCID: PMC10823858 DOI: 10.1177/17588359231225029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 12/19/2023] [Indexed: 01/31/2024] Open
Abstract
Purpose This study aimed to investigate clinical practices and factors related to the outcomes of T-DM1 use in patients with HER2-positive metastatic breast cancer (mBC). Methods We included patients with HER2-positive mBC who received T-DM1 as a palliative therapy between August 2017 and December 2018. The safety and outcomes of T-DM1, including overall response rate (ORR), progression-free survival (PFS), and overall survival (OS), were evaluated. A Cox proportional hazards model was used to estimate the hazard ratio and 95% confidence interval (CI) for mortality or progression to HER2-positive mBC. Results In total, 824 patients were enrolled during the study period. The mean age of patients was 58 years, and 516 (62.6%) patients relapsed after curative treatment. Excluding a history of endocrine therapy, 341 (41.4%) patients previously received none or first-line chemotherapy, 179 (21.7%) received second-line therapy, and 303 (36.9%) received third-or later-line chemotherapy before T-DM1 therapy. During a median follow-up of 16.8 months, the ORR was 35%, the median PFS was 6.6 months, and the median OS was not reached. The clinical factors associated with the hazard of progression were age (<65 years), poor performance status (⩾2), advanced line of palliative chemotherapy (⩾2), prior pertuzumab use, and treatment duration of palliative trastuzumab (<10 months). Common grade 3-4 adverse events were thrombocytopenia (n = 107, 13.2%), neutropenia (n = 23, 2.8%), anemia (n = 21, 2.6%), and elevated liver enzyme (n = 20, 2.5%). Hypokalemia (⩽3.0 mmol/L) and any-grade bleeding events occurred in 25 (3.1%) and 94 (22.6%) patients, respectively. Conclusion This is the first nationwide real-world study of T-DM1 use in patients with HER2-positive mBC in Korea. The effectiveness and toxicity profiles of T-DM1 in real-world practice were comparable to those in randomized trials. Moreover, patient factors and previous anti-HER2 therapy could predict the outcomes of T-DM1 therapy.
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Affiliation(s)
- Sun Kyung Baek
- Department of Internal Medicine, Kyung Hee University Medical Center, Seoul, Republic of Korea
| | - Jae-ho Jeong
- Department of Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - KyungHae Jung
- Department of Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Hee Kyung Ahn
- Division of Medical Oncology and Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Republic of Korea
| | - Min Hwan Kim
- Division of Medical Oncology and Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Joohyuk Sohn
- Division of Medical Oncology and Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - In Hae Park
- Division of Oncology, Department of Internal Medicine, Korea University Guro Hospital, Seoul, Republic of Korea
| | - Jin Seok Ahn
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Dae-Won Lee
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea
| | - Seock-Ah Im
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea
| | - Sung Hoon Sim
- Center for Breast Cancer, National Cancer Center, Goyang, Republic of Korea
| | - Keun Seok Lee
- Center for Breast Cancer, National Cancer Center, Goyang, Republic of Korea
| | - Jee Hyun Kim
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Republic of Korea
| | - Hyun-Jeong Shim
- Department of Hematology-Oncology, Chonnam National University Medical School and Hwasun Hospital, Gwangju, Republic of Korea
| | - Yeesoo Chae
- Department of Internal Medicine, Kyungpook National University Chilgok Hospital, Daegu, Republic of Korea
| | - Su-Jin Koh
- Department of Hematology and Oncology, Ulsan University Hospital, Ulsan, Republic of Korea
| | - Hyorak Lee
- Division of Hematology/Oncology, Korea Cancer Center Hospital, Seoul, Republic of Korea
| | - Jieun Lee
- Division of Medical Oncology, Department of Internal Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Jae-Ho Byun
- Division of Medical Oncology, Department of Internal Medicine, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Incheon, Republic of Korea
| | - Youngmi Seol
- Division of Hematology and Oncology, Department of Internal Medicine, Pusan National University Hospital, Busan, Republic of Korea
| | - Eun Mi Lee
- Department of Internal Medicine, Kosin University Gaspel Hospital, Busan, Republic of Korea
| | - Hee-Jung Jee
- Department of Biostatistics, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Hyonggin An
- Department of Biostatistics, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Eun Byeol Park
- Department of Biostatistics, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Young Ju Suh
- Department of Biomedical Sciences, College of Medicine, Inha University, Incheon, Republic of Korea
| | - Kyoung Eun Lee
- Department of Hematology and Oncology, Ewha Womans University Hospital, 1071 Anyangcheon-ro, Yangcheon-gu, Seoul 07985, Republic of Korea
| | - Yeon Hee Park
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81, Irwon-ro, Gangnam-gu, Seoul 06351, Republic of Korea
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