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A radioimmunoconjugate consisting of a humanized monoclonal antibody directed against prostate specific membrane antigen (PSMA) labeled with the alpha particle-emitting radioisotope actinium Ac-225, with potential antineoplastic activity. Upon administration, actinium Ac-225 anti-PSMA monoclonal antibody J591 binds to the extracellular domain of PSMA with high affinity, thereby delivering alpha radiation to PSMA expressing cells. PSMA, a type II membrane protein expressed in all types of prostatic tissues, is often overexpressed in tumor cells.
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