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Two Blokes Jun 18 -
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85% remission rate observed in evaluable frontline AML patients Mipletamig combination enables rare pathway to transplant in a previously ineligible unfit patient No dose-limiting toxicities observed among evaluable patients; safety profile remains strong Evidence mounts for mipletamig as a potentially transformational addition to standard of care in frontline AML as targeted CD123 x CD3 approach showing power and precision, limited added toxicity Mipletamig Trial Momentum Builds as Cohort 3 Nears Full Enrollment at highest dose level evaluated to date in combination therapy SEATTLE, WA / ACCESS Newswire / June 18, 2025 / Aptevo Therapeutics ("Aptevo") (Nasdaq:APVO), a clinical-stage biotechnology company developing novel bispecific immuno-oncology therapeutics based on its proprietary ADAPTIR\u00ae and ADAPTIR-FLEX\u00ae platform technologies, today announced new clinical data from its ongoing Phase 1b/2 RAINIER trial evaluating mipletamig, its first-in-class CD123 x CD3 bispecific antibody, in combination with standard-of-care venetoclax and azacitidine (ven/aza) for newly diagnosed patients with acute myeloid leukemia (AML) who are unfit for intensive chemotherapy. Across two trials, the mipletamig triplet therapy delivered remissions in 85% of evaluable frontline AML patients-which significantly exceeds results from competitor studies, including those achieved in the Viale A trial that evaluatedvenetoclax and azacitidine (ven/aza) as doublet therapy.
