NEW YORK - Actinium Pharmaceuticals, Inc. (NYSE AMERICAN: ATNM) (Actinium or the Company), a leader in the development of Antibody Radiation Conjugates (ARCs) and other targeted radiotherapies, today announced that results from the Phase 3 SIERRA trial of Iomab-B in patients with a TP53 mutation have been accepted for oral presentation at the 50th Annual meeting of the European Bone Marrow Transplant Society (EBMT) being held April 14 - 17, 2024, in Glasgow, Scotland.

Iomab-B is a targeted radiotherapy conditioning agent comprised of an anti-CD45 monoclonal antibody and Iodine-131 radioisotope payload. The Phase 3 SIERRA trial enrolled 153 patients with active relapsed or refractory acute myeloid leukemia (r/r AML) and compared outcomes of patients receiving Iomab-B and a bone marrow transplant (BMT) to those of patients receiving physician's choice of care in the control arm. In total, 24% of patients (37/153) in the SIERRA trial had a TP53 mutation, which is associated with poor outcomes, and 27 of the TP53 positive patients received Iomab-B. Iomab-B met the primary endpoint of durable Complete Remission (dCR) in the SIERRA trial with high-statistical significance (p

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