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MK-1200

Phase 1

Advanced Solid Tumors | Monoclonal antibody | Oncology |Merck & Company, Inc.|Last Updated: Jun 5, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedCONTROLLEDBiomarker
Total Trials1
Total Enrollment13
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06242691Safety and Efficacy of MK-1200 in Participants With Advanced Solid Tumors (MK-1200-002)PHASE1 COMPLETED 13Feb 28, 2024Jun 17, 2025Jun 5, 202616 United States, Australia +4
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Study Endpoints
Primary Endpoints
Number of Participants Who Experience One or More Dose-Limiting Toxicities (DLTs) - Part 1
During the first two 14-day cycles (Up to approximately 28 days)

The occurrence of any of the following toxicities within 28 days after the first dose of study intervention were considered a DLT, if assessed by the investigator to be possibly, probably, or definitely related to study intervention administration: * Grade 4 nonhematologic toxicity (not laboratory). Any nonhematologic AE ≥Grade 3 in severity was considered a DLT, with pre-specified exceptions * Any Grade 3 or Grade 4 laboratory value (hematologic or nonhematologic), with pre-specified exceptions * Febrile neutropenia Grade 3 or Grade 4 as prespecified by the protocol * Prolonged delay (\>2 weeks) in initiating Cycle 2 due to intervention-related toxicity * Any intervention-related toxicity that caused the participant to discontinue intervention during Cycle 1 * Missed \>25% of MK-1200 doses as a result of drug-related AEs during the first cycle * Grade 5 toxicity

Number of Participants Who Experience One or More Adverse Events (AEs) - Part 1 & Part 2
Up to approximately 12 months

An AE was any untoward medical occurrence in a participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. The number of participants who experienced an AE is reported for each arm.

Number of Participants Who Discontinue Study Intervention Due to an AE - Part 1 & Part 2
Up to approximately 9 months

An AE was any untoward medical occurrence in a participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. The number of participants who discontinued study intervention due to an AE is reported for each arm.

Secondary Endpoints
Objective Response Rate (ORR) Per Response Evaluation Criteria In Solid Tumors Version 1.1 (RECIST 1.1) as Assessed by Blinded Independent Central Review (BICR) - Part 2 Cohort A
Up to approximately 13 months
ORR Per RECIST 1.1 as Assessed by Investigator - Part 1 & Part 2 Cohort B
Up to approximately 13 months
Area Under the Concentration Versus Time Curve From Time 0 to 336 Hours (AUC0-336) of MK-1200-Antibody-Drug Conjugate (ADC) - Parts 1 and 2
Cycle 1 Day 1: predose and 0.5, 2, 4, 8, 24, 72, 168, 240, and 336 hours postdose. A cycle was 14 days.
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Part 1: MK-1200EXPERIMENTALIn Part 1, participants will receive escalating doses of MK-1200 via intravenous (IV) infusion every 2 weeks (Q2W) until any discontinuation criteria are met.
Part 2: MK-1200 Cohort AEXPERIMENTALIn Part 2, participants in Cohort A will receive either Dose 1 or Dose 2 of MK-1200 (determined from Part 1) via IV infusion Q2W until any discontinuation criteria are met.
Part 2: MK-1200 Cohort BEXPERIMENTALIn Part 2, participants in Cohort B will receive Dose 1 of MK-1200 (determined from Part 1) via IV infusion Q2W until any discontinuation criteria are met.
Interventions
NameTypeDescription
MK-1200BIOLOGICALIV Infusion
AntiemeticDRUGOne or more prophylactic antiemetic(s) (e.g. 5-HT3 receptor antagonists, dexamethasone, neurokinin-1 receptor antagonists, etc.) may be selected based on previous response of participants to antiemetic medications and individual factors, and will be administered per approved product label prior to MK-1200 infusion
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites16

Inclusion Criteria: * Confirmed advanced (unresectable and/or metastatic) solid tumor: gastric cancer (including gastroesophageal junction cancer), esophageal cancer, biliary tract cancer, or pancreatic ductal adenocarcinoma * Participants who experienced Adverse Events (AEs) due to previous antica...

Countries:United StatesAustraliaChileChinaIsraelSouth Korea
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Recent Changes (Last 90 Days)
MEDIUMApr 8, 2026NCT06242691TRIAL_REMOVED: changed
MEDIUMApr 8, 2026NCT06242691TRIAL_REMOVED: changed