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MK-1045

Phase 1

Systemic Lupus Erythematosus | Monoclonal antibody | Immunology |Merck & Company, Inc.|Last Updated: May 29, 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 Enrollment21
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07363590A Clinical Study of MK-1045 in People With Lupus or Rheumatoid Arthritis (MK-1045-004)PHASE1 RECRUITING 21Feb 19, 2026Jul 16, 2029May 29, 202612 Australia, Belgium +6
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Study Endpoints
Primary Endpoints
Part 1: Number of Participants with One or More Adverse Events (AEs)
Up to approximately 12 weeks

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.

Part 1: Number of Participants who Discontinue Study Drug Due to an AE
Up to approximately 4 weeks

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.

Part 2 and Part 3: Number of Participants with One or More AEs
Up to approximately 52 weeks

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.

Part 2 and Part 3: Number of Participants who Discontinue Study Drug Due to an AE
Up to approximately 2 weeks

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
Part 1: Maximum Serum Concentration (Cmax) of MK-1045
At designated time points up to 12 weeks
Part 1: Area Under the Concentration-Time Curve from Time 0 to Infinity (AUC0-Inf) of MK-1045
At designated time points up to 12 weeks
Part 1: Percentage of Participants with a Peripheral B Cell Count Less Than the Lower Limit of Quantitation (LLOQ) at the End of Each Treatment Period
At designated time points up to 12 weeks
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Part 1 Prime Dose Escalation PanelsEXPERIMENTALParticipants will receive single intravenous (IV) doses of MK-1045 at varying dose levels.
Part 2 Step-up Dose Escalation PanelsEXPERIMENTALParticipants will receive 3 step up doses of MK-1045 as a prime, step-up and target dose over a 3-week dosing interval.
Part 3 Dose Expansion Panels (Optional)EXPERIMENTALParticipants will receive 3 step up doses of MK-1045 as a prime, step-up and target dose over a 3-week dosing interval.
Interventions
NameTypeDescription
MK-1045BIOLOGICALIV infusion
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Eligibility Criteria
Age Range18 Years — 75 Years
SexALL
Healthy VolunteersNo
Study Sites12

Inclusion Criteria: * Has a body mass index between 18 and 32 kg/m\^2, inclusive * Systemic lupus erythematosus (SLE): Has a diagnosis of SLE for at least 6 months and met the European Alliance of Associations for Rheumatology (EULAR)/ American College of Rheumatology (ACR) 2019 classification crit...

Countries:AustraliaBelgiumChinaGeorgiaItalyJapanMoldovaRomania
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Recent Changes (Last 90 Days)
LOWMay 29, 2026NCT07363590lastUpdatePostDate: changed
LOWMay 29, 2026NCT07363590lastUpdatePostDate: changed
LOWMay 29, 2026NCT07363590lastUpdatePostDate: changed
LOWMay 27, 2026NCT07363590lastUpdatePostDate: changed
LOWMay 27, 2026NCT07363590lastUpdatePostDate: changed
LOWMay 26, 2026NCT07363590primaryCompletionDate: changed
LOWMay 24, 2026NCT07363590studyFirstPostDate: changed