
Incyte says mutant CALR antibody INCA033989 delivers sustained responses in Phase 1 myelofibrosis, essential thrombocythemia studies

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Incyte reported updated Phase 1 data for INCA033989, a mutant CALR-targeted antibody, at EHA 2026. The drug showed rapid, durable clinical and molecular responses in myelofibrosis and essential thrombocythemia with manageable safety. A pivotal Phase 3 study in essential thrombocythemia begins mid-2026, while regulators are engaged on the myelofibrosis program. The FDA granted Breakthrough Therapy designation in November 2025.
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