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Phase Ib/II Trial of Pembrolizumab (MK-3475) Combination Therapies in Metastatic Castration-Resistant Prostate Cancer (mCRPC) (KEYNOTE-365)

Status
Recruiting
Phases
Phase 1Phase 2
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2023-506987-15-00
Acronym
MK-3475-365
Enrollment
294
Registered
2024-04-09
Start date
2016-11-17
Completion date
Unknown
Last updated
2025-11-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Metastatic Castration-Resistant Prostate Cancer

Brief summary

Percentage of Participants With a Decrease of ≥50% in Prostatic Specific Antigen (PSA), Number of Participants with Adverse Events (AEs), Number of Participants Discontinuing Study Drug Due to AEs, Objective Response Rate (ORR) Based on Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1) Assessed by Blinded Independent Central Review (BICR)

Detailed description

Disease Control Rate (DCR) Based on RECIST 1.1 Assessed by BICR, Disease Control Rate (DCR) Based on Prostate Cancer Working Group 3 (PCWG3)-modified RECIST 1.1 Assessed by BICR, Overall Survival (OS), Duration of Response (DOR) Based on RECIST 1.1 Assessed by BICR, Duration of Response (DOR) Based on PCWG3-modified RECIST 1.1 Assessed by BICR, ORR Based on PCWG3-modified RECIST 1.1 Assessed by BICR, Time to PSA Progression, Radiographic Progression-free Survival (rPFS) Based on PCWG3-modified RECIST 1.1 Assessed by BICR, Composite Response Rate Defined as Any One of the Following: A. Response Based on RECIST 1.1; B. PSA Decrease of ≥50%; or C. Circulating Tumor-cell Count Conversion (Pembrolizumab + Olaparib Cohort Only)

Interventions

DRUGENZALUTAMIDE
DRUGLenvatinib
DRUGCARBOPLATIN
DRUGOlaparib
DRUGPREDNISONE
DRUGBelzutifan
DRUGABIRATERONE
DRUGETOPOSIDE
DRUGKEYTRUDA 25 mg/mL concentrate for solution for infusion
DRUGDEXAMETHASONE
DRUGDOCETAXEL

Sponsors

Merck Sharp & Dohme LLC
Lead SponsorINDUSTRY

Eligibility

Sex/Gender
Male
Age
18 Years to No maximum

Design outcomes

Primary

MeasureTime frame
Percentage of Participants With a Decrease of ≥50% in Prostatic Specific Antigen (PSA), Number of Participants with Adverse Events (AEs), Number of Participants Discontinuing Study Drug Due to AEs, Objective Response Rate (ORR) Based on Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1) Assessed by Blinded Independent Central Review (BICR)

Secondary

MeasureTime frame
Disease Control Rate (DCR) Based on RECIST 1.1 Assessed by BICR, Disease Control Rate (DCR) Based on Prostate Cancer Working Group 3 (PCWG3)-modified RECIST 1.1 Assessed by BICR, Overall Survival (OS), Duration of Response (DOR) Based on RECIST 1.1 Assessed by BICR, Duration of Response (DOR) Based on PCWG3-modified RECIST 1.1 Assessed by BICR, ORR Based on PCWG3-modified RECIST 1.1 Assessed by BICR, Time to PSA Progression, Radiographic Progression-free Survival (rPFS) Based on PCWG3-modified RECIST 1.1 Assessed by BICR, Composite Response Rate Defined as Any One of the Following: A. Response Based on RECIST 1.1; B. PSA Decrease of ≥50%; or C. Circulating Tumor-cell Count Conversion (Pembrolizumab + Olaparib Cohort Only)

Countries

Austria, Denmark, Finland, France, Germany, Ireland, Italy, Netherlands, Poland, Spain, Sweden

Outcome results

None listed

Source: EU CTIS · Data processed: Feb 4, 2026