Study With [225Ac]Ac-FL-020 in mCRPC Participants

\[225Ac\]Ac-FL-020 injected intravenously

Following the first injection of \[225Ac\]Ac-FL-020, blood samples after treatment will be collected for PK evaluation.

A dose of \[111In\]In-FL-020 will be injected prior to the first dose of \[225Ac\]Ac-FL-020 for dosimetry evaluation

For dosimetry evaluation and urine excretion assessment, blood and urine samples will be collected after the injection of \[111In\]In-FL-020

For dosimetry evaluation, SPECT/CTs will be performed following the injection of \[111In\]In-FL-020.