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MK-3120

Phase 1

Advanced Solid Tumors | Monoclonal antibody | Oncology |Merck & Company, Inc.|Last Updated: Sep 3, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedCONTROLLED
Total Trials1
Total Enrollment270

FDA Designations

No designations recorded

Clinical trial landscape

MK-3120 · 3 trials · 4 indications

Phase 1 3
NCT07232602KEYMAKER-U04 Substudy 04D: A Clinical Study of New Treatments Given With Enfortumab Vedotin and Pembrolizumab in People With Urothelial Cancer (MK-3475-04D/KEYMAKER-U04)Bladder Cancer
RECRUITING55 Analytics
NCT07222488A Clinical Study of MK-3120 in People With Bladder Cancer (MK-3120-003)Bladder Cancer
RECRUITING45 Analytics
NCT06818643A Study to Evaluate the Safety and Efficacy of MK-3120 in Participants With Advanced Solid Tumors (MK-3120-002)Advanced Solid Tumors
RECRUITING270 Analytics
PHASE1RECRUITING
KEYMAKER-U04 Substudy 04D: A Clinical Study of New Treatments Given With Enfortumab Vedotin and Pembrolizumab in People With Urothelial Cancer (MK-3475-04D/KEYMAKER-U04)
Bladder CancerUnlock trial analytics
PHASE1RECRUITING
A Clinical Study of MK-3120 in People With Bladder Cancer (MK-3120-003)
Bladder CancerUnlock trial analytics
PHASE1RECRUITING
A Study to Evaluate the Safety and Efficacy of MK-3120 in Participants With Advanced Solid Tumors (MK-3120-002)
Advanced Solid TumorsUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants Who Experience an Adverse Event (AE)
Up to approximately 27 months

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. The number of participants that experience AEs will be reported.

Number of Participants Who Experience a Dose Limiting Toxicity (DLT)
Up to approximately 21 days

DLT will be defined as any drug-related AE observed during the DLT evaluation period that results in a change to a given dose or a delay in initiating the next treatment. The number of participants who experience a DLT as Assessed Using Common Terminology Criteria for Adverse Events (CTCAE) Version 5.0 will be presented.

Number of Participants Who Discontinue Study Treatment Due to an AE
Up to approximately 24 months

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. The number of participants that discontinue study intervention due to an AE will be reported.

Objective Response Rate (ORR) as Assessed by Investigator
Up to approximately 58 months

ORR is defined as the percentage of participants with Complete Response (CR: disappearance of all target lesions) or Partial Response (PR: at least a 30% decrease in the sum of diameters of target lesions) per Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1). The percentage of participants who experience CR or PR as assessed by Investigator will be presented.

Number of Participants Who Experience a Dose-limiting Toxicity (DLT)
Up to approximately 5 weeks

Any of the following toxicities will be considered a DLT: Hematuria leading to clot or obstruction; Grade (Gr) 4 thrombocytopenia; Gr 3 thrombocytopenia associated with clinically significant bleeding; Febrile neutropenia for more than 1 hour; Other Gr ≥3 hematologic toxicity lasting \>7 days; Nonhematologic AE ≥Gr 3 (with exceptions); ≥Gr 2 pneumonitis/ interstitial lung disease; Any ≥Gr 3 nonhematologic laboratory value if clinically significant medical intervention is required, leads to hospitalization, persists for \>7 days, results in a drug induced liver injury, or elevated aspartate aminotransferase (AST) or alanine aminotransferase (ALT) lab value \>8 ×upper limit of normal (ULN) regardless of duration and AST or ALT elevation 5 × to 8 × ULN that persists for greater than 2 weeks; Recurrent Gr 2 AE resulting in \>2 weeks delay in receiving the next treatment dose; Any intervention-related toxicity that results in study intervention discontinuation; Gr 5 toxicity or AE.

Number of Participants Who Experience One or More Adverse Events (AEs)
Up to approximately 24 months

An AE is defined as any unfavorable and unintended sign, symptom, disease, or worsening of preexisting condition temporally associated with study treatment and irrespective of causality to study treatment.

Number of Participants Who Discontinue Study Treatment Due to AEs
Up to approximately 12 months

An AE is defined as any unfavorable and unintended sign, symptom, disease, or worsening of preexisting condition temporally associated with study treatment and irrespective of causality to study treatment.

Secondary Endpoints

Duration of Response (DOR) as Assessed by Investigator
Up to approximately 58 months
Serum Maximum Concentration (Cmax) of MK-3120 Antibody-Drug Conjugate (ADC)
Predose and at designated time points post-dose (up to approximately 24 months)
Serum Trough Concentration (Ctrough) of MK-3120 ADC
Predose and at designated time points post-dose (up to approximately 24 months)
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Arm A: MK-3120 + Enfortumab Vedotin (EV) + PembrolizumabEXPERIMENTALParticipants will receive MK-3120 administered intravenously on Day 1 and Day 8 of each 3-week cycle and EV administered intravenously on Day 1 and Day 8 of each 3-week cycle until documented disease progression or any other discontinuation criterion is met and Pembrolizumab 200 mg administered intravenously on Day 1 of each 3-week cycle for up to 35 cycles (\~2 years).
MK-3120EXPERIMENTALParticipants will be administered MK-3120 once weekly for the first 6 weeks, followed by once monthly for 9 months.
Arm 1 Dose level 1EXPERIMENTALParticipants receive MK-3120 at dose level 1 as per the schedule specified in the arm.
Arm 2 Dose level 2EXPERIMENTALParticipants receive MK-3120 at dose level 2 as per the schedule specified in the arm.

Interventions

NameTypeDescription
MK-3120DRUGAdministered via intravenous (IV) infusion on day 1 and day 8 of each 3-week cycle
EVDRUGAdministered via IV infusion on day 1 and day 8 of each 3-week cycle
PembrolizumabBIOLOGICALAdministered via IV infusion on day 1 of each 3-week cycle
Rescue MedicationDRUGParticipants receive rescue medication at the investigator's discretion, per approved product label. Recommended rescue medication is Granulocyte Colony-Stimulating Factor (G-CSF).
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites16

Inclusion Criteria: The main inclusion criteria include but are not limited to the following: * Has histologically documented urothelial carcinoma (UC) that is locally advanced and unresectable or metastatic * Must provide a newly obtained or archival tumor tissue sample (core or excisional biopsy...

Countries:United StatesChileFranceIsraelNetherlandsSouth KoreaSpainUnited KingdomAustriaBelgiumCanadaGreeceItalyNorwayTurkey (Türkiye)ChinaJapanPolandTaiwan
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Competitive Landscape -Other Solid Tumors 9 trials (matched to "Advanced Solid Tumors")

Recent Changes (Last 90 Days)

LOWSep 3, 2026NCT07222488lastUpdatePostDate: changed
LOWSep 3, 2026NCT07222488lastUpdatePostDate: changed
LOWSep 1, 2026NCT07232602lastUpdatePostDate: changed
LOWSep 1, 2026NCT07232602lastUpdatePostDate: changed
LOWAug 24, 2026NCT07222488lastUpdatePostDate: changed
LOWAug 24, 2026NCT07222488lastUpdatePostDate: changed
LOWJul 27, 2026NCT06818643lastUpdatePostDate: changed
LOWJul 27, 2026NCT06818643lastUpdatePostDate: changed
LOWJul 27, 2026NCT06818643lastUpdatePostDate: changed
LOWJul 17, 2026NCT07222488lastUpdatePostDate: changed
LOWJul 17, 2026NCT07222488lastUpdatePostDate: changed
LOWJul 6, 2026NCT06818643lastUpdatePostDate: changed
LOWJul 6, 2026NCT06818643lastUpdatePostDate: changed
LOWJun 26, 2026NCT07232602lastUpdatePostDate: changed
LOWJun 26, 2026NCT07232602lastUpdatePostDate: changed
LOWJun 23, 2026NCT07222488lastUpdatePostDate: changed
LOWJun 23, 2026NCT07232602lastUpdatePostDate: changed
LOWJun 23, 2026NCT07222488lastUpdatePostDate: changed
LOWJun 23, 2026NCT07232602lastUpdatePostDate: changed

Frequently asked questions about MK-3120

What is MK-3120 used for?

MK-3120 is an investigational monoclonal antibody being studied for the treatment of advanced solid tumors and bladder cancer, including urothelial cancer. It is currently in Phase 1 clinical development and is not yet approved by regulatory authorities.

Who makes MK-3120?

MK-3120 is being developed by Merck & Company, Inc., which trades under the ticker symbol MRK. The company is conducting clinical trials to evaluate the safety and efficacy of this investigational therapy in oncology indications.

What phase is MK-3120 in?

MK-3120 is in Phase 1 clinical development. It is an investigational drug, meaning it has not been approved by the FDA or other regulatory agencies. All ongoing trials are in the recruiting stage, and no completed trials have been reported.

What clinical trials is MK-3120 in?

MK-3120 is being evaluated in two active Phase 1 trials: NCT06818643, a study in participants with advanced solid tumors enrolling 270 patients across multiple countries, and NCT07222488, a study in people with bladder cancer enrolling 45 patients. Both trials are currently recruiting.

Is MK-3120 being studied in combination with other drugs?

Yes, MK-3120 is being studied in combination with enfortumab vedotin and pembrolizumab in the KEYMAKER-U04 substudy 04D (NCT07232602) for patients with urothelial cancer. This is a separate Phase 1 trial from the monotherapy studies.

What is the mechanism of action of MK-3120?

MK-3120 is a monoclonal antibody, but its specific molecular target has not been disclosed in available information. As an investigational oncology therapy, it is being studied to determine its safety and potential efficacy in treating advanced solid tumors and bladder cancer.