Journal of hematology & oncology · 2026
Vibecotamab for measurable residual disease in acute myeloid leukemia and for myelodysplastic syndromes and chronic myelomonocytic leukemia after hypomethylating agent failure: a phase II study.
СтатьяКлиническое исследование II фазыНазвание и аннотация: Перевод в очереди
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Short Nicholas J, Bataller Alex, DiNardo Courtney D, Montalban-Bravo Guillermo, Wang Sa A, Wang Wei, Maiti Abhishek, Nguyen Daniel, Hachem Maria C, Bi Timothy M, Issa Ghayas C, Chien Kelly S, Ohanian Maro, Kadia Tapan M, Loghavi Sanam, Karrar Omer, Bachireddy Pavan, Hwang Hyunsoo, Huang Xuelin, Garcia-Manero Guillermo, Ravandi Farhad
Аннотация
BACKGROUND: Acute myeloid leukemia (AML) with persistent measurable residual disease (MRD) and relapsed/refractory myelodysplastic syndromes (MDS) are low-blast myeloid diseases for which there are few effective therapeutic options. CD123 represents an attractive target in these diseases. Vibecotamab is a bispecific antibody that binds to CD123 on malignant blasts and to CD3 on T-cells, to recognize and eliminate CD123-positive malignant cells.
METHODS: This single-center phase II study evaluated the efficacy of vibecotamab in patients AML with detectable MRD (AML-MRD cohort) or with MDS or chronic myelomonocytic leukemia (CMML) after hypomethylating agent failure (MDS/CMML cohort). In cycle 1, patients received vibecotamab IV on day 1 (0.43 µg/kg), day 3 (0.75 µg/kg), day 5 (1.1 µg/kg), and days 8, 15 and 22 (1.7 µg/kg). In subsequent cycles, patients received vibecotamab IV on days 1, 8, 15, and 22 (1.7 µg/kg). The primary outcomes were MRD negativity rate (AML-MRD cohort) and overall response (MDS/CMML cohort).
RESULTS: Between May 2022 and April 2025, 48 patients were enrolled (21 AML-MRD cohort, 27 MDS/CMML cohort). The median ages of the AML-MRD and the MDS/CMML cohorts were 70 and 76 years, respectively. In the AML-MRD cohort, the median MRD level by flow cytometry was 0.64% (range, 0.1-3.9%), and in the MDS/CMML, the median bone marrow blast percentage was 7% (range, 3-19%). The AML-MRD clearance rate was 19% (4/21; 95% CI 5-42%), and in the MDS/CMML cohort, the overall response rate was 67% (18/27; 95% CI 46-83%). The median overall survival was 13.1 months (95% CI 8.9-NR) for the AML-MRD cohort and 6.5 months (95% CI 4.2-10.3) for the MDS/CMML cohort. The most frequent adverse event was infusion reaction or cytokine relapse syndrome, which occurred in 29 patients (60%) overall, most of which were grade 1-2.
CONCLUSIONS: Vibecotamab was active in low-blast myeloid diseases, although the durability of responses was modest. Additional studies of CD123-targeting bispecific antibodies, alone or in combination, are warranted for these diseases.
TRIAL REGISTRATION: Clinicaltrials.gov (NCT05285813).
METHODS: This single-center phase II study evaluated the efficacy of vibecotamab in patients AML with detectable MRD (AML-MRD cohort) or with MDS or chronic myelomonocytic leukemia (CMML) after hypomethylating agent failure (MDS/CMML cohort). In cycle 1, patients received vibecotamab IV on day 1 (0.43 µg/kg), day 3 (0.75 µg/kg), day 5 (1.1 µg/kg), and days 8, 15 and 22 (1.7 µg/kg). In subsequent cycles, patients received vibecotamab IV on days 1, 8, 15, and 22 (1.7 µg/kg). The primary outcomes were MRD negativity rate (AML-MRD cohort) and overall response (MDS/CMML cohort).
RESULTS: Between May 2022 and April 2025, 48 patients were enrolled (21 AML-MRD cohort, 27 MDS/CMML cohort). The median ages of the AML-MRD and the MDS/CMML cohorts were 70 and 76 years, respectively. In the AML-MRD cohort, the median MRD level by flow cytometry was 0.64% (range, 0.1-3.9%), and in the MDS/CMML, the median bone marrow blast percentage was 7% (range, 3-19%). The AML-MRD clearance rate was 19% (4/21; 95% CI 5-42%), and in the MDS/CMML cohort, the overall response rate was 67% (18/27; 95% CI 46-83%). The median overall survival was 13.1 months (95% CI 8.9-NR) for the AML-MRD cohort and 6.5 months (95% CI 4.2-10.3) for the MDS/CMML cohort. The most frequent adverse event was infusion reaction or cytokine relapse syndrome, which occurred in 29 patients (60%) overall, most of which were grade 1-2.
CONCLUSIONS: Vibecotamab was active in low-blast myeloid diseases, although the durability of responses was modest. Additional studies of CD123-targeting bispecific antibodies, alone or in combination, are warranted for these diseases.
TRIAL REGISTRATION: Clinicaltrials.gov (NCT05285813).