NEW YORK - Actinium Pharmaceuticals, Inc. (NYSE AMERICAN: ATNM) (Actinium or the Company), a leader in the development of targeted radiotherapies, today announced that results from the Phase 3 SIERRA trial of Iomab-B were presented in an oral presentation at the 65th Annual American Society of Hematology Meeting & Exposition (ASH).

The oral presentation highlighted significantly improved survival in patients with a TP53 mutation receiving Iomab-B.

Iomab-B is a targeted radiotherapeutic comprised of an anti-CD45 monoclonal antibody with the Iodine-131 radioisotope payload. The Phase 3 SIERRA trial enrolled 153 patients with active relapsed or refractory acute myeloid leukemia (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, which was intended to reflect current best practices. Patients not achieving a Complete Remission (CR) in the control arm who were unable to proceed to a BMT were offered to crossover to receive an Iomab-B led BMT.

Iomab-B achieved the primary endpoint in the SIERRA trial of durable Complete Remission (dCR) of at least 6 months with high statistical significance (p5%), relapsed or refractory acute myeloid leukemia (r/r AML) age 55 and above.

Iomab-B met the primary endpoint of durable Complete Remission (dCR) of 6 months after initial remission post-BMT in the pivotal Phase 3 SIERRA trial with high statistical significance (p

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