On April 1, 2024 Actinium Pharmaceuticals, Inc. (NYSE AMERICAN: ATNM) (Actinium or the Company), a leader in the development of Antibody Radiation Conjugates (ARCs) and other targeted radiotherapies, reported 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<0.0001) and 100% of patients receiving a therapeutic dose of Iomab-B achieved BMT access and engagement.
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Dr. Hannah Choe, Assistant Professor of Medicine at Ohio State University and SIERRA trial investigator will present the SIERRA results. Details of the oral presentation are as follows:
Title: I-131-Apamistamab-Led Allogeneic Hematopoietic Cell Transplant Demonstrates Survival Benefit and Overcomes High-Risk TP53 Mutations in Patients with R/R AML
Date and Time: Wednesday, April 17, 2024, 12:39 PM GMT
Session: OS17-02
Location: Scottish Event Campus (SEC Centre)
Dr. Avinash Desai, Actinium’s Chief Medical Officer, said, "In addition to demonstrating unprecedented 100% access to BMT in Iomab-B treated patients with active r/r AML and achieving the primary endpoint of dCR with high statistical significance, we are excited by the compelling outcomes in patients with a TP53 mutation in the SIERRA trial. We look forward to returning to EBMT and once again highlighting the positive results from the Phase 3 SIERRA trial to the European bone marrow transplant community. We are particularly focused on Europe as it represents the largest bone marrow transplant market performing 40% of the BMT transplants globally. We also look forward to continuing to work with our European, Middle East and North African commercial partner, Immedica Pharma Ab, to bring Iomab-B to patients globally."
About the EBMT Annual Meeting
The Annual Meeting of the EBMT is attended by more than 5,500 participants, including physicians, nurses, data managers, statisticians, quality managers, cell therapists, paediatricians, pharmacists, psychologists, psychiatrists and psychoanalysts, transplant coordinators, lab scientists, trainees, patients. This important congress ensures and encourages dialogues and information exchange, education and scientific productivity.
The full annual meeting program is available online at:
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