NorthStar Medical Radioisotopes, LLC, a global innovator in the development, production and commercialization of radiopharmaceuticals used for therapeutic applications and medical imaging, and Inhibrx, Inc. (Nasdaq: INBX), a biopharmaceutical company dedicated to the development of therapeutics for oncology and rare diseases, today announced a collaboration to develop and produce novel radiopharmaceuticals for the treatment of cancer.

Inhibrx will use its optimized single-domain antibodies (sdAbs) to create a new generation of targeted alpha therapies. Inhibrx has an extensive history of sdAb innovation and has developed a library of sdAbs targeting tumor-associated antigens. sdAbs are ideal biological targeting agents for delivery of radioisotopes, due to their high binding affinity and specificity to tumor cells or antigen-expressing cells within the tumor microenvironment. Alpha-emitting radioisotopes have a short range of activity and high energy transfer and, when targeted, allow for precise killing of cancer cells with minimal damage to surrounding healthy tissues.

NorthStar is expanding its industry-leading position in the growing area of therapeutic radioisotopes and is now poised to be the first commercial-scale producer of non-carrier added (n.c.a.) actinium-225 (Ac-225) and copper-67 (Cu-67). In the past, drugs containing Ac-225 have shown clinical efficacy, but previous iterations have been limited by lack of sufficient actinium supply. The union of precision-targeted sdAbs with an ample actinium supply has the potential to enable development of novel targeted radiopharmaceutical therapies that may provide accessible, effective options for cancer treatment.

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