Rigel Pharmaceuticals Reports Updated Phase 1b Data for R289 in Lower-Risk MDS Patients

Reuters
2025.12.10 21:07
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Rigel Pharmaceuticals announced updated Phase 1b data for R289, a dual IRAK1/4 inhibitor, in lower-risk myelodysplastic syndrome patients. The study, presented at the ASH Annual Meeting, shows R289 is well tolerated with preliminary efficacy at doses of 500 mg or more. 33% of transfusion-dependent patients achieved red blood cell transfusion independence. The study is ongoing, with a Phase 2 dose selection expected in the second half of 2026. R289 has Orphan Drug and Fast Track designations from the FDA.