Actinium Ac 225-FL-020

**Semantic type:** Pharmacologic Substance

**Definition:** A radioconjugate composed of FL-020, a human prostate-specific membrane antigen (PSMA)-targeting ligand, conjugated to the alpha-emitting radioisotope actinium Ac 225, with potential antineoplastic activity. Upon administration of actinium Ac 225-FL-020, FL-020 targets and binds to PSMA-expressing tumor cells. Upon binding, the radioisotope moiety delivers a cytotoxic dose of alpha radiation to PSMA-expressing tumor cells. PSMA, a tumor-associated antigen (TAA) and type II transmembrane protein, is expressed on the membrane of prostatic epithelial cells and overexpressed on prostate tumor cells as well as a variety of other solid tumors.

**Synonyms:** - Actinium Ac 225 FL-020 - Actinium Ac 225-labeled FL-020 - [225Ac]-FL-020 - [225Ac]Ac-FL-020