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HER2-targeting antibody drug conjugate FS-1502 in HER2-expressing metastatic breast cancer: a phase 1a/1b trial

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机构: [1]Department of Medical Oncology, State Key Laboratory, National Cancer Center/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China. [2]Department of Oncology, Jilin Cancer Hospital, Changchun, China. [3]Department of Breast Medical Oncology, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China. [4]Department of Breast Center, The Fourth Hospital of Hebei Medical University, Shijiazhuang, China. [5]Department of Medical Oncology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China. [6]Department of Breast Medicine, Henan Cancer Hospital, Zhengzhou, Henan, China. [7]Department of Medical Oncology, Cancer Hospital Chinese Academy of Medical Sciences, Shenzhen Center, Shenzhen, China. [8]Sun Yat-sen University Cancer Center, Guangzhou, Guangdong, China. [9]Department of Medical Oncology, Meizhou People's Hospital, Meizhou, Guangdong, China. [10]Department of Clinical Pharmacology, The Fourth Hospital of Hebei Medical University, Shijiazhuang, China. [11]Shanghai Fosun Pharmaceutical Industrial Development Co., Ltd., Shanghai, China. [12]Shanghai Fosun Pharmaceutical Development Co., Ltd., Shanghai, China. [13]EnCureGen Pharma, Guangzhou, China. [14]Department of Medical Oncology, State Key Laboratory, National Cancer Center/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
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Currently approved HER2-targeting antibody-drug conjugates (ADCs) for HER2-positive breast cancer (BC) are associated with safety concerns. In this multicenter, single-arm, dose-escalation (phase 1a) and dose-expansion (phase 1b) phase 1 trial (NCT03944499), patients with HER2-expressing advanced solid tumors received FS-1502 (an anti-HER2 ADC) with a 3 + 3 design in phase 1a; patients with metastatic HER2-positive BC received FS-1502 at the recommended phase 2 dose (RP2D) in phase 1b. The primary end points were dose-limiting toxicities (DLTs), maximum tolerated dose (MTD) and RP2D for phase 1a and objective response rate (ORR) for phase 1b. A total of 150 patients with HER2-expressing solid tumors (n = 5) and BC (n = 145) were enrolled (female, n = 146, 97.3%). One DLT each was reported at 3.0 and 3.5 mg/kg; the MTD was not reached. The RP2D was 2.3 mg/kg once every 3 weeks. Five (3.3%) patients experienced pneumonitis; four (2.7%) had grade 3 reversible ocular events. Of 67 HER2-positive BC patients receiving the RP2D, the best ORR was 53.7% (95% CI, 41.1-66.0%), including PRs confirmed (confirmed ORR, 37.5%) and pending for confirmation. FS-1502 was well tolerated with limited ocular and pulmonary findings and demonstrated promising antitumor activity in HER2-positive BC patients.© 2024. The Author(s).

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Q1 MULTIDISCIPLINARY SCIENCES

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第一作者机构: [1]Department of Medical Oncology, State Key Laboratory, National Cancer Center/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
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