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Pembrolizumab/Vibostolimab coformulation

Phase 2

Metastatic Non Small Cell Lung Cancer | Monoclonal antibody | Oncology |Merck & Company, Inc.|Last Updated: Feb 19, 2026

Target and mechanism

Molecular targetPDCD1
Target classInhibitor
ModalityMonoclonal antibody

Also known as Pembrolizumab, MK-3475, pembrolizumab, KEYTRUDA®, KEYTRUDA, Pembrolizumab Injection [Keytruda], Pembrolizumab (Keytruda), Pembrolizumab (MK-3475)

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment255

FDA Designations

PRIORITY_REVIEW

Clinical trial landscape

Pembrolizumab/Vibostolimab coformulation · 2 trials · 2 indications

Phase 2 2
NCT05005442A Study of Pembrolizumab/Vibostolimab (MK-7684A) in Relapsed/Refractory Hematological Malignancies (MK-7684A-004, KEYVIBE-004)Hematological Malignancies
COMPLETED192 Analytics
NCT04725188Pembrolizumab/Vibostolimab Coformulation (MK-7684A) or Pembrolizumab/Vibostolimab Coformulation Plus Docetaxel Versus Docetaxel for Metastatic Non Small Cell Lung Cancer (NSCLC) With Progressive Disease After Platinum Doublet Chemotherapy and Immunotherapy (MK-7684A-002, KEYVIBE-002)Metastatic Non Small Cell Lung Cancer
COMPLETED255 Analytics
PHASE2COMPLETED
A Study of Pembrolizumab/Vibostolimab (MK-7684A) in Relapsed/Refractory Hematological Malignancies (MK-7684A-004, KEYVIBE-004)
Hematological MalignanciesUnlock trial analytics
PHASE2COMPLETED
Pembrolizumab/Vibostolimab Coformulation (MK-7684A) or Pembrolizumab/Vibostolimab Coformulation Plus Docetaxel Versus Docetaxel for Metastatic Non Small Cell Lung Cancer (NSCLC) With Progressive Disease After Platinum Doublet Chemotherapy and Immunotherapy (MK-7684A-002, KEYVIBE-002)
Metastatic Non Small Cell Lung CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of Participants With a Dose-Limiting Toxicity (DLT)
Up to approximately 6 weeks

A DLT is defined as an event with toxicity including the type, severity, time of onset, time of resolution, and the probable association with study treatment that are not due to pre-existing conditions as defined by the Common Terminology Criteria for Adverse Events Version 5.0 (CTCAE 5.0). Percentage of participants who experience a DLT per CTCAE 5.0 are reported.

Percentage of Participants Who Experienced an Adverse Event (AE)
Up to approximately 27 months

An AE is any unfavorable and unintended sign, symptom, or disease temporally associated with the use of a medicinal product or protocol-specified procedure, whether or not considered related to the medicinal product or protocol-specified procedure. Any worsening of a preexisting condition that is temporally associated with the use of the Sponsor's product, is also an adverse event. The number of participants who experience an AE are reported.

Percentage of Participants Who Discontinued Study Treatment Due to an AE
Up to approximately 24 months

An AE is any unfavorable and unintended sign, symptom, or disease temporally associated with the use of a medicinal product or protocol-specified procedure, whether or not considered related to the medicinal product or protocol-specified procedure. Any worsening of a preexisting condition that is temporally associated with the use of the Sponsor's product, is also an adverse event. The number of participants discontinued from the study treatment due to an AE are reported.

Progression Free Survival (PFS) Per Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1) by Blinded Independent Central Review (BICR) Assessment
Up to approximately 21 months

PFS is defined as the time from randomization to the first documented disease progression (PD) or death due to any cause, whichever occurs first. Per RECIST 1.1, PD is defined as ≥20% increase in the sum of diameters of target lesions. In addition to the relative increase of 20%, the sum must also demonstrate an absolute increase of ≥5 mm. The appearance of one or more new lesions is also considered PD. PFS as assessed by BICR is presented.

Secondary Endpoints

Objective Response Rate (ORR) as Assessed by Lugano 2014 Classification (Cohorts A-D & F)
Up to approximately 37 months
ORR as Assessed by the 2016 International Myeloma Working Group (IMWG) Response Criteria (Cohort E)
Up to approximately 37 months
Duration of Response (DOR) as Assessed by Lugano 2014 Classification (Cohorts A-D & F)
Up to approximately 37 months
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Pembrolizumab/vibostolimab coformulationEXPERIMENTALParticipants will receive pembrolizumab/vibostolimab (coformulation of 200 mg pembrolizumab and 200 mg vibostolimab) via intravenous IV infusion once every 3 weeks (Q3W) for up to 35 cycles up to approximately 2 years.
Arm 1: Pembrolizumab/Vibostolimab coformulation + DocetaxelEXPERIMENTALParticipants receive pembrolizumab/vibostolimab (coformulation of 200 mg pembrolizumab and 200 mg vibostolimab) via intravenous (IV) infusion once every 3 weeks (Q3W) for up to 35 cycles up to approximately 2 years plus docetaxel 75 mg/m\^2 via IV infusion Q3W. Each cycle will be 21 days.
Arm 2: Pembrolizumab/Vibostolimab coformulationEXPERIMENTALParticipants receive pembrolizumab/vibostolimab (coformulation of 200 mg pembrolizumab and 200 mg vibostolimab) via IV infusion Q3W for up to 35 cycles up to approximately 2 years. Each cycle will be 21 days.
Arm 3: Placebo + DocetaxelACTIVE_COMPARATORParticipants receive normal saline placebo via IV infusion Q3W for up to 35 cycles up to approximately 2 years plus docetaxel 75 mg/m\^2 IV infusion Q3W. Each cycle will be 21 days.

Interventions

NameTypeDescription
Pembrolizumab/vibostolimab coformulationBIOLOGICALPembrolizumab 200 mg + vibostolimab 200 mg/20 mL vial IV infusion Q3W up to approximately 2 years.
DocetaxelDRUGDocetaxel 75 mg\^m2 IV infusion Q3W until discontinuation due to progressive disease or unacceptable toxicity. Docetaxel will serve as part of an experimental treatment in Arm 1, and as an active comparator in Arm 3.
PlaceboDRUGNormal saline IV infusion Q3W up to approximately 2 years
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites65

Inclusion Criteria \- Have confirmed relapsed/refractory classic Hodgkins Lymphoma (cHL), Primary mediastinal B-cell lymphoma (PMBCL), Follicular Lymphoma (FL), Diffuse large B-cell lymphoma (DLBCL) or Non-Hodgkins Lymphoma (NHL), or multiple myeloma (MM). For PMBCL, DLBCL, FL, and MM: \- Must be...

Countries:United StatesBrazilCanadaChileDenmarkFranceGermanyHungaryIsraelItalyPolandRussiaSpainTaiwanTurkey (Türkiye)UkraineArgentinaAustraliaAustriaBelgiumFinlandMalaysiaSouth KoreaSwitzerlandThailand
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Competitive Landscape -Non-Small Cell Lung Cancer 389 trials (matched to "Metastatic Non Small Cell Lung Cancer")

Frequently asked questions about Pembrolizumab/Vibostolimab coformulation

What is MK-3475 used for?

MK-3475, also known as pembrolizumab and marketed as KEYTRUDA, is an investigational antibody being studied for several oncology indications, including Primary Mediastinal Large B-cell Lymphoma (PMBCL), prostate cancer, anal cancer, squamous cell carcinoma, non-small-cell lung cancer, B-cell lymphoma, and oligometastatic squamous cell carcinoma of the head and neck.

What does MK-3475 target?

MK-3475 is a monoclonal antibody (target class -mab) that targets the PD-1 receptor. By binding to PD-1, it is designed to block the interaction with its ligands, potentially enhancing the immune system's ability to fight cancer cells.

Who makes MK-3475?

MK-3475 is developed by Merck & Company, Inc., which trades under the ticker MRK. Merck is conducting clinical trials to evaluate the drug's safety and efficacy across multiple cancer types.

What phase is MK-3475 in?

MK-3475 is in Phase 1 clinical development. It has received a Priority Review designation from the FDA. The drug is investigational and not yet approved, with ongoing trials assessing its use in various cancers.

What clinical trials is MK-3475 in?

MK-3475 is being studied in 17 clinical trials, with 5 active and 12 completed, enrolling over 8,000 participants. Notable trials include NCT02635360 for cervical cancer, NCT04875195 for Hodgkin's lymphoma and PMBCL, NCT04976634 for solid tumors, and NCT05815927 for head and neck cancer.

Is MK-3475 the same as pembrolizumab?

Yes, MK-3475 is the same as pembrolizumab, which is also known by the brand name KEYTRUDA. The drug is referred to by multiple names including Pembrolizumab 200 mg, Pembrolizumab Injection, and Pembrolizumab (MK-3475), among others.