Updated Safety Of Midostaurin Plus Chemotherapy In Newly Diagnosedflt3mutation-Positive Acute Myeloid Leukemia: The Radius-X Expanded Access Program

LEUKEMIA & LYMPHOMA(2020)

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Abstract
Approval of midostaurin, a multikinase inhibitor, in combination with chemotherapy for the treatment of adults with newly diagnosedFLT3mutation-positive acute myeloid leukemia, was based on the phase 3 RATIFY trial results. RADIUS-X (NCT02624570) was an expanded access program providing access to midostaurin during regulatory review and extending the understanding of the safety and tolerability of midostaurin. Patients aged >= 18 years received midostaurin with 1-2 cycles of induction therapy (cytarabine plus daunorubicin or idarubicin) and <= 4 cycles of high-dose cytarabine consolidation chemotherapy or as single-agent maintenance therapy. The study enrolled 103 patients. No new safety events were observed; toxicities were not influenced by age, anthracycline choice, or coadministration of CYP3A4 inhibitors. The most common adverse events (AEs) were febrile neutropenia, nausea, and diarrhea. During maintenance, 46% of patients reported AEs. Midostaurin demonstrated a manageable safety profile and was associated with high transplant and low on-treatment relapse rates.
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Key words
Acute myeloid leukemia, midostaurin, FLT3, idarubicin, maintenance
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