About

Actinium Pharmaceuticals, Inc. is a clinical-stage biopharmaceutical company developing targeted radiotherapies to deliver cancer-killing radiation with cellular level precision to treat patients with high unmet needs. Actinium's clinical pipeline is led by radiotherapies that are being applied to targeted conditioning, which is intended to selectively deplete a patient's disease or cancer cells and certain immune cells prior to a bone marrow transplant (BMT), gene therapy or adoptive cell therapy, such as CAR-T, to enable engraftment of these transplanted cells with minimal toxicities. Our lead product candidate, I-131 apamistamab (Iomab-B) has been studied in over four hundred patients, including the pivotal Phase 3 Study of Iomab-B in Elderly Relapsed or Refractory Acute Myeloid Leukemia (SIERRA) trial for BMT conditioning. Topline data from the SIERRA trial are expected in the fourth quarter of 2022. Iomab-ACT, low dose I-131 apamistamab, is being studied as a targeted conditioning agent in a Phase 1 study with a CD19 CAR T-cell Therapy with Memorial Sloan Kettering Cancer Center with NIH funding. Actimab-A, our second most advanced product candidate has been studied in approximately 150 patients with Acute Myeloid Leukemia or AML, including in ongoing combination trials with the chemotherapy regimen CLAG-M and with venetoclax, a targeted therapy. Actimab-A or lintuzumab-Ac225 is an Actinium-225 based antibody radiation conjugate targeting CD33, a validated target in AML. Actinium is a pioneer and leader in the field of Actinium-225 alpha therapies with an industry leading technology platform comprising over 190 patents and patent applications including methods of producing the radioisotope AC-225. Our technology and expertise have enabled collaborative research partnerships with Astellas Pharma, Inc. for solid tumor theranostics, with AVEO Oncology Inc. to create an Actinium-225 HER3 targeting radiotherapy for solid tumors, and with EpicentRx, Inc. to create targeted radiotherapy combinations with their novel, clinical stage small molecule CD47-SIRPα inhibitor.

Bone Marrow Transplant Induction and Conditioning in One

Iomab-B, Actinium’s lead asset, is being studied in the pivotal Phase 3 SIERRA clinical trial as an induction and conditioning agent in patients over the age of 55 with active relapsed or refractory Acute Myeloid Leukemia (AML) prior to receiving a bone marrow transplant (BMT), also known as a hematopoietic stem cell transplant or HSCT. The SIERRA trial completed patient enrollment in the third quarter of 2021. View highlights of Key Opinion Leaders discussing Iomab-B:

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Robust Pipeline

Actinium Pharmaceuticals' drug development pipeline features Iomab-B, which completed enrollment of its pivotal Phase 3 clinical trial, Iomab-ACT, which is intended to be a conditioning regimen for cell and gene therapies that is being studied in an NIH funded clinical study and Actimab-A, which is being studied in two combination trials for relapsed/refractory AML. Actinium is focused on continuing to expand its drug development pipeline of targeted radiotherapies for patients with blood cancers and solid tumors.

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Bone Marrow Transplant Induction and Conditioning in One

Robust Pipeline

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