CI

At a glance

ClinicalIndex Comparison Record
Phase 2Active· 302 enrolled / 302 target
Drug / intervention
Pembrolizumab +4 morebiological
Likely dose
Pembrolizumab 400 mgfrom record
Structured eligibility isn't available for this trial yet — see the full criteria in the Eligibility tab below.

Standardized by ClinicalIndex from the ClinicalTrials.gov record · verify against the source.

Search/NCT04895722
NCT04895722Phase 2ActiveUpdate Overdue (5.0/mo)Completion was 13mo ago

A Phase 2, Multicenter, Multi Arm, Study to Evaluate MK-1308A (Co-formulated Quavonlimab (MK-1308)/Pembrolizumab) Versus Other Treatments in Participants With Microsatellite Instability-High (MSI-H) or Mismatch Repair Deficient (dMMR) Stage IV Colorectal Cancer: (MK-1308A-008)

Merck Sharp & Dohme LLC·interventional·Posted May 20, 2021·Updated Jun 8, 2026

In Brief

A Phase 2 clinical trial evaluating Pembrolizumab, Pembrolizumab/Quavonlimab, and 3 other interventions for Colorectal Cancer. Active but no longer recruiting, targeting 302 participants across 109 sites in 22 countries.

Signals

Enrollment appears stalled

Detailed Summary

The purpose of this study is to assess the efficacy and safety of co-formulated pembrolizumab/quavonlimab versus other treatments in participants with MSI-H or dMMR Metastatic Stage IV Colorectal Cancer.

Study Details

Study Typeinterventional
Allocation--
Masking--
Primary Purpose--
CountriesBelgium, Canada, Colombia, Costa Rica, Denmark, Estonia, France, Germany, Greece, Guatemala, Hungary, Italy, Lithuania, Netherlands, Poland, Romania, Russia, South Korea, Spain, Turkey (Türkiye), United Kingdom, United States
Collaborators--

Timeline

Phase 2Active
20222023202420252026
First PostedMay 20, 2021
Enrollment StartJun 25, 2021
Primary CompletionMay 21, 2025
Study CompletionAug 13, 2026
TodayJul 2, 2026
Enrollment to primary: 3.9 yearsPosted 5.1 years ago

Arms & Interventions

Cohort A - Pembrolizumab/Quavonlimabexperimental

Participants in Cohort A receive co-formulated pembrolizumab/quavonlimab (400 mg/25 mg) every 6 weeks (Q6W) for up to approximately 2 years.

Biological: Pembrolizumab/Quavonlimab
Cohort A - Pembrolizumabactive_comparator

Participants in Cohort A receive pembrolizumab 400 mg intravenously (IV) Q6W for up to approximately 2 years.

Biological: Pembrolizumab
Cohort B - Pembrolizumab/Quavonlimabexperimental

Participants received co-formulated pembrolizumab/quavonlimab (400 mg/25 mg) Q6W for up to approximately 2 years.

Biological: Pembrolizumab/Quavonlimab
Cohort B - Pembrolizumab Plus MK-4830experimental

Participants receive pembrolizumab 200 mg plus MK-4830 800 mg Q3W for up to approximately 2 years.

Biological: PembrolizumabBiological: MK-4830
Cohort B - Pembrolizumab/Favezelimabexperimental

Participants receive co-formulated pembrolizumab/favezelimab (200 mg/800 mg) every 3 weeks (Q3W) for up to approximately 2 years.

Biological: Pembrolizumab/Favezelimab
Cohort B - Pembrolizumab/Vibostolimabexperimental

Participants receive co-formulated pembrolizumab/vibostolimab (200 mg/200 mg) Q3W for up to approximately 2 years.

Biological: Pembrolizumab/Vibostolimab
Cohort B - Pembrolizumabactive_comparator

Participants in Cohort B receive pembrolizumab 400 mg IV Q6W for up to approximately 2 years.

Biological: Pembrolizumab

Interventions

Pembrolizumabbiological

400 mg or 200 mg pembrolizumab administered via IV infusion.

Pembrolizumab/Quavonlimabbiological

Co-formulated pembrolizumab/quavonlimab (400 mg/25 mg) fixed-dose combination (FDC) administered via IV infusion.

Pembrolizumab/Favezelimabbiological

Co-formulated pembrolizumab/favezelimab (200 mg/800 mg) FDC administered via IV infusion

Pembrolizumab/Vibostolimabbiological

Co-formulated pembrolizumab/vibostolimab (200 mg/200 mg) FDC administered via IV infusion

MK-4830biological

800 mg MK-4830 administered via IV infusion