Abstract
Inotuzumab ozogamicin (InO) is a targeted treatment for adults with relapsed or refractory B-cell acute lymphoblastic leukemia (ALL). InO was previously studied in INO-VATE, an international, open-label, randomized phase 3 trial comparing InO against standard of care (SoC). In the present subgroup analysis, we evaluated outcomes in the 55 Asian patients who were randomized in INO-VATE (31 InO and 24 SoC). Complete remission (CR) or CR with incomplete hematologic recovery (CRi) was achieved in 22/31 patients treated with InO versus 5/24 treated with SoC. In the InO arm, more of the patients achieving CR/CRi were minimal residual disease (MRD)-negative (17/22 versus 1/5), and more patients proceeded directly to hematopoietic stem cell transplantation (15/31 versus 3/24). Median overall survival for the respective arms was 5.8 versus 3.9 months (hazard ratio 0.67; 97.5% CI 0.28, 1.62). In the safety analysis (n = 51), the most common adverse events were hematologic. Sinusoidal obstruction syndrome was reported in five InO patients and one SoC patient. In conclusion, Asian patients with relapsed or refractory B-cell ALL experienced improved efficacy with InO versus SoC, with an efficacy and safety profile consistent with results of the overall INO-VATE population.
Clinical trial registration: ClinicalTrials.gov identifier: NCT01564784.
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This study was sponsored by Pfizer. Medical writing support was provided by Geraldine Thompson of Engage Scientific Solutions (Horsham, UK) and funded by Pfizer.
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Naohito Fujishima: Honoraria (Pfizer). Toshiki Uchida: Honoraria (Janssen, Pfizer). Yasushi Onishi: research funding (BMS, MSD, Takeda). Chul Won Jung: no disclosures to report. Yeow Tee Goh: no disclosures to report. Kiyoshi Ando: Research funding (Celgene, Astellas, Novartis, Otsuka, Eisai, Boehringer Ingelheim, MSD, Ono, IQVIA), subsidies or donations (Novartis, Meiji Seika, Kyowa Hakko Kirin, Eisai, Takeda, Mochida). Ming Chung Wang: no disclosures to report. Chiho Ono: employment (Pfizer). Miyako Matsumizu: employment (Pfizer). M. Luisa Paccagnella: employment (Pfizer), stock ownership (Pfizer). Barbara Sleight: employment (Pfizer), stock ownership (Pfizer). Erik Vandendries: Employment (Pfizer), stock ownership (Pfizer). Yosuke Fujii: employment (Pfizer). Masayuki Hino: Honoraria (Pfizer), subsidies or donations (Pfizer, Kyowa Hakko Kirin, Chugai, Astellas, Taiho, Ono, JB).
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Fujishima, N., Uchida, T., Onishi, Y. et al. Inotuzumab ozogamicin versus standard of care in Asian patients with relapsed/refractory acute lymphoblastic leukemia. Int J Hematol 110, 709–722 (2019). https://doi.org/10.1007/s12185-019-02749-0
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DOI: https://doi.org/10.1007/s12185-019-02749-0