(UroToday.com) The European Association of Urology (EAU) 2021 Virtual Annual Meeting included a joint session of the EAU and the Canadian Urological Association and a presentation by Dr. Christian La Fougere discussing prostate radioligand therapy and its use earlier in the disease process. Dr. La Fougere notes that the theranostic key-lock principle includes a target (ie. membrane-antigens, PSMA), a ligand (ie. small molecules, PSMA-617), a linker, and a chelator (ie. PET-reporting unit, 68Ga, 64Cu, 18F; or therapeutic unit, 90Y, 177Lu, 213Bi, 225Ac):