Phase Ib Study of PRT543, an Oral Protein Arginine Methyltransferase 5 (PRMT5) Inhibitor, in Patients with Relapsed or Refractory, Splicing Factor-Mutant Myeloid Malignancies
Bewersdorf J, Mi X, Lu B, Kuykendall A, Sallman D, Patel M, Stevens D, Philipovskiy A, Sutamtewagul G, Masarova L, Keiffer G, Verma A, Bhagwat N, Heiser D, Ro S, Hong W, Abdel-Wahab O, Stein E. Phase Ib Study of PRT543, an Oral Protein Arginine Methyltransferase 5 (PRMT5) Inhibitor, in Patients with Relapsed or Refractory, Splicing Factor-Mutant Myeloid Malignancies. Blood 2024, 144: 3215. DOI: 10.1182/blood-2024-198495.Peer-Reviewed Original ResearchTreatment-emergent adverse eventsPlatelet transfusion independenceProtein arginine methyltransferase 5Myeloid malignanciesSplicing factor mutationsSymmetric dimethyl arginineMedian PFSTransfusion independenceFollow-upOpen-label phase Ib studyRed blood cell transfusion-dependentPRMT5 inhibitionAdequate end-organ functionBaseline serum EPO levelsRecommended phase 2 doseMedian duration of treatmentGrade 5 eventsLower-risk MDSMDS/MPN overlap syndromesPhase 2 doseIntensive induction chemotherapyPeripheral blood mononuclear cellsHigh-risk MDSPhase Ib studyMedian follow-up