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RECRUITING
NCT07594106
PHASE1/PHASE2

REGN15505 (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 Carcinoma

Sponsor: Regeneron Pharmaceuticals

View on ClinicalTrials.gov

Summary

This study is researching a new drug called REGN15505 when used alone or in combination with cemiplimab or in combination with REGN4336 in adult patients with mCRPC and ccRCC. The goal is to explore new ways to treat these cancers by helping immune cells target and destroy cancer cells. The study will evaluate the use of REGN15505 when administered alone, in combination with cemiplimab, or in combination with REGN4336 for: * Any side effects of study drugs * How well the study drugs work * How much REGN15505, cemiplimab, and REGN4336 are in the blood at different times * If the body makes antibodies to REGN15505 or REGN4336, which may mean the study drugs will not work as well as expected * What is the best dose of REGN15505 when administered alone and with cemiplimab and the best dose of REGN15505 and REGN4336 when used in combination

Official title: Phase 1/2 Study of REGN15505 (a PSMAx4-1BB Bispecific Antibody) Administered Alone or in Combination With Cemiplimab or REGN4336 (a PSMAxCD3 Bispecific Antibody) in Patients With Metastatic Castration-Resistant Prostate Cancer and Clear Cell Renal Cell Carcinoma

Key Details

Gender

All

Age Range

18 Years - Any

Study Type

INTERVENTIONAL

Enrollment

265

Start Date

2026-07-20

Completion Date

2030-10-27

Last Updated

2026-08-05

Healthy Volunteers

No

Interventions

DRUG

REGN15505

Administered per protocol

DRUG

REGN15505+Cemiplimab

Administered per protocol

DRUG

REGN15505+REGN4336

Administered per protocol

Locations (4)

City of Hope Phoenix

Goodyear, Arizona, United States

City of Hope

Duarte, California, United States

City of Hope Chicago, City of Hope Cancer Center Chicago

Zion, Illinois, United States

The University of Texas MD Anderson Cancer Center

Houston, Texas, United States