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MK-8690

Phase 2

Colitis Ulcerative | Small molecule | Gastrointestinal |Merck & Company, Inc.|Trials Updated: Sep 28, 2026

MK-8690 development status

Highest phase Phase 2
Registered trials 2 across 2 sponsors since Nov 2022

MK-8690 target and mechanism

ModalitySmall molecule

Also known as PRA052

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials2
Total Enrollment196

FDA Designations

No designations recorded

MK-8690 clinical trials

MK-8690 · 2 trials · 3 indications

Phase 2 1Phase 1 1
NCT07463183A Study to Evaluate Efficacy and Safety of MK-8690 in Participants With Moderately to Severely Active Ulcerative Colitis (MK-8690-002)Colitis Ulcerative
RECRUITING100 Analytics
PHASE2RECRUITING
A Study to Evaluate Efficacy and Safety of MK-8690 in Participants With Moderately to Severely Active Ulcerative Colitis (MK-8690-002)
Colitis UlcerativeUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of Participants Achieving Clinical Remission Per Modified Mayo Score (MMS) at Week 12
Week 12

The MMS is a composite score of UC disease activity on a scale of increasing severity from 0-9, calculated by summing three subscores: Endoscopic subscore (ES), scored on a scale of increasing severity from 0 (normal or inactive disease) to 3 (severe disease, such as spontaneous bleeding or ulceration); Stool frequency subscore (SFS), scored on a scale of increasing frequency from 0 (normal number of stools) to 3 (≥5 stools more than normal per day for the participant); and rectal bleeding subscore (RBS), scored on a scale of increasing severity from 0 (no blood seen) to 3 (blood alone passed). Clinical Remission is defined as an ES of 0 or 1 with no friability, RBS of 0, and SFS of 0 or 1 and not greater than the baseline SFS.

Treatment emergent adverse events
Up to 20 weeks

Incidence, severity, and causal relationship of TEAEs

Secondary Endpoints

Percentage of Participants With One or More Adverse Events (AEs)
Up to approximately 12 months
Percentage of Participants Who Discontinued Study Intervention Due to an AE
Up to approximately 12 months
Percentage of Participants Achieving Clinical Response Per MMS at Week 12
Week 12
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Period 1: MK-8690EXPERIMENTALParticipants will receive MK-8690 via subcutaneous injection for 12 weeks.
Period 1: PlaceboPLACEBO_COMPARATORParticipants will receive placebo via subcutaneous injection for 12 weeks.
Period 2: MK-8690EXPERIMENTALParticipants who do not respond to treatment in Period 1 (regardless of treatment assignment in Period 1) will receive MK-8690 via subcutaneous injection for 12 weeks.
Period 3: MK-8690EXPERIMENTALParticipants who respond to treatment in either Period 1 or Period 2 will receive additional MK-8690 via subcutaneous injection for up to approximately 42 weeks.
SAD Cohorts 1-8 Experimental ArmEXPERIMENTALSubjects will receive a single intravenous or subcutaneous dose of PRA052 in a dose escalation format
SAD Cohorts 1-8 Placebo ArmPLACEBO_COMPARATORSubjects will receive a single intravenous or subcutaneous dose of placebo
MAD Cohorts 1-5 Experimental ArmEXPERIMENTALSubjects will receive three subcutaneous or intravenous doses of PRA052, one dose every 2 weeks, in a dose escalation format
MAD Cohorts 1-5 Placebo ArmPLACEBO_COMPARATORSubjects will receive three subcutaneous or intravenous doses of placebo, one dose every 2 weeks

Interventions

NameTypeDescription
MK-8690DRUGSolution for subcutaneous injection
PlaceboOTHERSolution for subcutaneous injection
PRA052DRUGPRA052
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Eligibility Criteria

Age Range18 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites38

The main inclusion criteria include but are not limited to the following: * Has had ulcerative colitis (UC) (from onset of symptoms) for at least 3 months before Randomization * Has moderately to severely active UC * Has a weight ≥40 kg * Satisfies at least 1 of the criteria: Has had an inadequate ...

Countries:United StatesCanadaColombiaFranceGermanyGreeceItalyNetherlandsPolandSouth KoreaUnited Kingdom
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Recent Changes (Last 90 Days)

LOWSep 28, 2026NCT07463183lastUpdatePostDate: changed
LOWSep 28, 2026NCT07463183lastUpdatePostDate: changed
LOWSep 19, 2026NCT07463183lastUpdatePostDate: changed
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LOWSep 9, 2026NCT07463183lastUpdatePostDate: changed
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LOWAug 31, 2026NCT07463183lastUpdatePostDate: changed
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LOWJul 28, 2026NCT07463183lastUpdatePostDate: changed
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Frequently asked questions about MK-8690

What is MK-8690 used for?

MK-8690 is an investigational small molecule being studied for the treatment of moderately to severely active ulcerative colitis, a form of inflammatory bowel disease. It is not yet approved for any use and remains in clinical development. Merck is evaluating it in adults aged 18 and older.

Who makes MK-8690?

MK-8690 is being developed by Merck & Company, Inc., which trades on the New York Stock Exchange under the ticker MRK. Merck is the sponsor of the clinical program evaluating the drug in ulcerative colitis.

What phase is MK-8690 in?

MK-8690 is in Phase 2 clinical development. It is an investigational small molecule and has not been approved by the FDA or any other regulatory agency. The ongoing Phase 2 study is currently recruiting participants.

What clinical trials is MK-8690 in?

MK-8690 is being studied in one active clinical trial, NCT07463183, titled a study to evaluate efficacy and safety of MK-8690 in participants with moderately to severely active ulcerative colitis. The Phase 2 trial is recruiting, is randomized, double blind, and placebo controlled, and plans to enroll 100 participants across the United States, Canada, Colombia, France, Germany, Greece, Italy, the Netherlands, Poland, South Korea, and the United Kingdom.

Is MK-8690 placebo controlled?

Yes. The Phase 2 trial of MK-8690, NCT07463183, is a randomized, double blind, placebo controlled study. Participants with moderately to severely active ulcerative colitis are assigned to MK-8690 or placebo, and the study plans to enroll approximately 100 participants aged 18 years and older.