Phase IIIa Study of 64Cu-SAR-bisPSMA and 67Cu-SAR-bisPSMA for Treating and Identifying PSMA-Positive Metastatic Castration-Resistant Prostate Cancer

What this Trial Is About

Researchers are evaluating the safety and effectiveness of two drugs, 64Cu-SAR-bisPSMA and 67Cu-SAR-bisPSMA, in men with prostate cancer that has spread and no longer responds to hormone-lowering treatments. This study focuses on cancers that express a protein called PSMA and aims to find safe and effective dosing while monitoring how the drugs behave in the body. Participants will go through different study phases. In the initial dosimetry phase, a single dose of 200 MBq of 64Cu-SAR-bisPSMA is given. Later phases involve receiving multiple doses of 64Cu-SAR-bisPSMA or 67Cu-SAR-bisPSMA, with doses and number of administrations varying by phase and participant group. The dose escalation phase tests increasing doses of 67Cu-SAR-bisPSMA, followed by a cohort expansion phase with up to six doses of the recommended 67Cu-SAR-bisPSMA dose. During the study, participants will undergo PETCT scans to track drug distribution and dosimetry within 48 hours of dosing. Researchers will measure prostate-specific antigen PSA levels and radiographic responses over up to five years to evaluate treatment effects. Safety will be monitored through assessments of vital signs, ECGs, laboratory tests, and recording any adverse events. The total study duration can extend up to five years for long-term follow-up.

64Cu-SAR-bisPSMA and 67Cu-SAR-bisPSMA for Identification and Treatment of PSMA-expressing Metastatic Castrate Resistant Prostate Cancer (SECuRE)