NCT07594106 2026-05-18REGN15505 (PSMAx4-1BB) Alone or in Combination With Cemiplimab or REGN4336 (PSMAxCD3) in Adult Patients With Metastatic Castration-Resistant Prostate Cancer and Clear Cell Renal Cell CarcinomaRegeneron PharmaceuticalsPhase 1/2 Not yet recruiting265 enrolled