River Ridge

Researchers are studying the safety and effectiveness of 67Cu-SAR-bisPSMA in men with metastatic castrate resistant prostate cancer that expresses PSMA. This Phase I/IIa trial focuses on participants whose cancer has progressed despite androgen deprivation therapy and prior treatments with androgen receptor pathway inhibitors. The study aims to understand how the drug distributes in the body, determine safe dosing levels, and evaluate treatment responses over several years. Participants receive two drugs: 64Cu-SAR-bisPSMA for imaging and dosimetry, and 67Cu-SAR-bisPSMA for treatment. The study includes a dose escalation phase to find the maximum tolerated or feasible dose of a single 67Cu-SAR-bisPSMA dose over 8 weeks, followed by a recommended dosing phase with two doses over 14 weeks. Imaging with PET/CT scans using 64Cu-SAR-bisPSMA helps model dosimetry for the therapeutic 67Cu-SAR-bisPSMA. The treatment is given under close monitoring to assess safety and response. During the study, participants undergo PET/CT scans, blood tests, ECGs, and vital sign monitoring at various times up to 5 years to track drug distribution, treatment effects on prostate specific antigen levels, radiographic cancer response, and any side effects. Safety is closely followed through laboratory results and adverse event reporting. Participants are monitored for long-term tolerability and treatment outcomes, with study involvement lasting up to five years.