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Tulisokibart

Phase 3

Crohn Disease | Monoclonal antibody | Immunology |Merck & Company, Inc.|Last Updated: May 19, 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
RandomizedDouble-BlindCONTROLLEDDMCBiomarker
Total Trials2
Total Enrollment1,435
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06651281Extension Study of Long-term Safety and Efficacy of Tulisokibart in Participants With Crohn's Disease or Ulcerative Colitis (MK-7240-011)PHASE3 RECRUITING 1,380Nov 25, 2024Dec 17, 2037May 19, 202637 United States, Czechia +5
NCT05013905A Phase 2a Safety and Efficacy Open-Label Study of Tulisokibart (MK-7240/PRA023) in Participants With Moderately to Severely Active Crohn's Disease (MK-7240-006)PHASE2 COMPLETED 55Jul 28, 2021May 27, 2025Apr 21, 202637 United States, Australia +6
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Study Endpoints
Primary Endpoints
Number of Participants Who Experience an Adverse Event (AE)
Up to approximately 378 weeks

An AE is 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 experience an AE will be reported.

Number of Participants Who Discontinue Study Treatment Due to an AE
Up to approximately 364 weeks

An AE is 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 discontinue study treatment due to an AE will be reported.

Adverse Events
Week 12

Number of participants who experienced treatment-emergent adverse events (AEs)

Serious Adverse Events
Week 12

Number of participants who experienced serious adverse events (SAEs)

Adverse Events Leading to Discontinuation
Week 12

Number of participants who experienced AEs leading to discontinuation

Endoscopic Improvement
Week 12

Number of participants achieving induction of endoscopic improvement (decrease in simple endoscopy score for Crohn's disease \[SES-CD\] ≥ 50% from Baseline)

Secondary Endpoints
Percentage of Participants with Crohn's Disease Achieving Clinical Remission per Crohn's Disease Activity Index (CDAI) Score
Week 364
Percentage of Participants with Crohn's Disease Achieving Clinical Remission per Stool Frequency and Abdominal Pain Score
Week 364
Percentage of Participants with Crohn's Disease With Endoscopic Remission Per Simplified Endoscopic Score for Crohn's Disease (SES-CD)
Week 364
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Group 1: Low Dose UnblindedEXPERIMENTALParticipants receive a low dose subcutaneous (SC) tulisokibart regimen.
Group 2: High Dose UnblindedEXPERIMENTALParticipants receive a high dose SC tulisokibart regimen.
Group 3: High Dose BlindedEXPERIMENTALParticipants receive a blinded high dose SC tulisokibart regimen.
Group 4: Low Dose BlindedEXPERIMENTALParticipants receive a blinded low dose SC tulisokibart regimen.
Induction TulisokibartEXPERIMENTALDuring the 12-week Induction Period, participants receive tulisokibart administered by intravenous (IV) infusion at 1000 mg on Day 1 of Week 0, and 500 mg on Day 1 of Weeks 2, 6, and 10.
OLE Tulisokibart 100 mgEXPERIMENTALAfter completing the 12-week Induction Period, eligible participants have the option to enter the OLE Period for up to 170 weeks. Participants are randomized into the OLE Period to receive 100 mg tulisokibart by IV infusion every 4 weeks (q4w).
OLE Tulisokibart 250 mgEXPERIMENTALAfter completing the 12-week Induction Period, eligible participants have the option to enter the OLE Period for up to 170 weeks. Participants are randomized into the OLE Period to receive 250 mg tulisokibart by IV infusion q4w.
Interventions
NameTypeDescription
TulisokibartDRUGHumanized monoclonal antibody that binds human tumor necrosis factor-like cytokine 1A (TL1A), administered subcutaneously
Placebo to tulisokibartDRUGPlacebo matching SC tulisokibart
Companion Diagnostic (CDx)DIAGNOSTIC_TESTPRA023 CDx Genotyping Assay
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites37

Inclusion Criteria: * Has participated in a qualifying tulisokibart Phase 2 or Phase 3 parent study for CD or UC * The investigator determines that the participant derives clinical benefit from continued study intervention based upon clinical evaluations performed during their parent study * A part...

Countries:United StatesCzechiaFranceGeorgiaHungaryPolandUnited KingdomAustraliaBelgiumCanada
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT06651281primaryCompletionDate: changed
LOWMay 24, 2026NCT06651281studyFirstPostDate: changed