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GLPG3667

Phase 2

Dermatomyositis | Small molecule | Immunology |Lakefront Biotherapeutics|Last Updated: May 14, 2026

Target and mechanism

ModalitySmall molecule

Also known as GLPG3667 oral suspension, GLPG3667 capsule, [14C]-GLPG3667 solution for infusion, GLPG3667 for infusion

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment40

FDA Designations

No designations recorded

Clinical trial landscape

GLPG3667 · 8 trials · 4 indications

Phase 2 2Phase 1 6
NCT05856448A Study Evaluating the Effects of GLPG3667 Administered as Oral Treatment in Adult Participants With Active Systemic Lupus ErythematosusSystemic Lupus Erythematosus
COMPLETED186 Analytics
NCT05695950A Study Evaluating the Effects of GLPG3667 Given as Oral Treatment for up to 24 Weeks in Adults With DermatomyositisDermatomyositis
COMPLETED40 Analytics
PHASE2COMPLETED
A Study Evaluating the Effects of GLPG3667 Administered as Oral Treatment in Adult Participants With Active Systemic Lupus Erythematosus
Systemic Lupus ErythematosusUnlock trial analytics
PHASE2COMPLETED
A Study Evaluating the Effects of GLPG3667 Given as Oral Treatment for up to 24 Weeks in Adults With Dermatomyositis
DermatomyositisUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of Participants who Achieved the SLE Responder Index (SRI)-4 Response at Week 32
Week 32
Total improvement score [TIS] according to the American College of Rheumatology (ACR)/European League Against Rheumatism (EULAR) criteria
Week 24

The TIS is a score derived from the evaluation of the results from 6 core set measurements (CSMs) of myositis disease activity: Physician's Global Disease Activity Assessment; Patient's Global Disease Activity Assessment; Muscle Manual Test-8 (MMT-8); Health Assessment Questionnaire-Disability Index (HAQ-DI); Enzymes (aldolase, creatine kinase (CK), alanine aminotransferase (ALT), aspartate aminotransferase (AST), and lactate dehydrogenase (LDH); and Extra-muscular disease activity. The TIS is a scale from 0 to 100 that allows for the discrimination between minimal, moderate and major responders depending on their improvement in the combined 6 CSM.

Recovery of total radioactivity (TRA) excreted in urine expressed as a percentage of the administered dose (Ae%)
From Day 1 until at least Day 8 in Period 2
Recovery of TRA excreted in feces expressed as a percentage of the administered dose (Af%)
From Day 1 until at least Day 8 in Period 2
Recovery of TRA excreted in urine and feces expressed as a percentage of the administered dose (At%)
From Day 1 until at least Day 8 in Period 2
Percentage of TRA in plasma and excreta for metabolites of interest
From Day 1 until at least Day 8 in Period 2
Absolute oral bioavailability (F[percentage]) of GLPG3667
From Day 1 until Day 4 in Period 1
Maximum observed plasma concentration (Cmax) of GLPG3667
From Day 1 pre-dose until Day 12

To determine the effect of itraconazole on the pharmacokinetics (PK) of GLPG3667

Area under the plasma concentration-time curve from time zero to infinity (AUC0-inf) of GLPG3667
From Day 1 pre-dose until Day 12

To determine the effect of itraconazole on the PK of GLPG3667

Frequency and severity of treatment-emergent adverse events (TEAEs), treatment-emergent serious adverse events, and TEAEs leading to treatment discontinuations
From screening through study completion, an average of 3 months

To evaluate the safety and tolerability of single and multiple oral doses of GLPG3667, in adult, healthy, male subjects compared with placebo

Area under the plasma concentration-time curve from time zero to infinity (AUC0-inf) of MDZ
From Day 1 until Day 9

To determine the effect of GLPG3667 on the pharmacokinetics (PK) of MDZ.

Maximum observed plasma concentration (Cmax) of MDZ
From Day 1 until Day 9

To determine the effect of GLPG3667 on the PK of MDZ.

Frequency and severity of treatment-emergent adverse events (TEAEs), treatment-emergent serious adverse events (SAEs), and TEAEs leading to treatment discontinuation in subjects with moderate to severe plaque psoriasis.
From screening through study completion, an average of 3 months

To evaluate the safety and tolerability of GLPG3667 compared to placebo in subjects with moderate to severe plaque psoriasis.

Psoriasis Area and Severity Index (PASI) % change
At week 4

To evaluate signs of clinical efficacy of GLPG3667 compared to placebo in subjects with moderate to severe plaque psoriasis.

Secondary Endpoints

Percentage of Participants who Achieved the SRI-4 Response at Week 48
Week 48
Percentage of Participants who Achieved the British Isles Lupus Assessment Group (BILAG)-Based Composite Lupus Assessment (BICLA) Response at Week 32 and Week 48
Week 32, Week 48
Percentage of Participants with >=50% Reduction in Cutaneous Lupus Erythematosus Disease Area and Severity Index Activity (CLASI-A) score at Week 32 and Week 48
Week 32, Week 48
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
GLPG3667 - Treatment AEXPERIMENTALParticipant will receive a dose A of GLPG3667 capsules orally once daily (q.d.) for 48 weeks.
GLPG3667 - Treatment BEXPERIMENTALParticipant will receive a dose B of GLPG3667 capsules orally (q.d.) for 48 weeks.
PlaceboPLACEBO_COMPARATORParticipant will receive placebo matched to GLPG3667 capsules orally q.d for 48 weeks.
GLPG3667 During DB + During OLEEXPERIMENTALParticipants will receive GLPG3667 dose A orally once daily for 24 weeks in the double-blind (DB) treatment period. Eligible participants will roll-over to an open-label extension (OLE) period to receive the same dose for another 24 weeks.
Placebo During DB + GLPG3667 During OLEPLACEBO_COMPARATORParticipants will receive placebo matching to GLPG3667 orally once daily for 24 weeks in the DB treatment period. Eligible participants will roll-over to an OLE period to receive GLPG3667 dose A orally once daily for another 24 weeks.
Period 1 - Absolute BioavailabilityEXPERIMENTAL -
Period 2 - Mass BalanceEXPERIMENTAL -
GLPG3667 + itraconazoleEXPERIMENTAL -
GLPG3667 SDEXPERIMENTALParticipants will receive a single dose of GLPG3667
Placebo SDPLACEBO_COMPARATORParticipants will receive a single dose of matching placebo
GLPG3667 MDEXPERIMENTALParticipants will receive repeated doses of GLPG3667 for 13 days.
Placebo MDPLACEBO_COMPARATORParticipants will receive repeated doses of matching placebo for 13 days.
GLPG3667 + MidazolamEXPERIMENTAL -
GLPG3667 Dose AEXPERIMENTALDaily doses of GLPG3667 for 4 weeks.
GLPG3667 Dose BEXPERIMENTALDaily doses of GLPG3667 for 4 weeks.
GLPG3667 SADEXPERIMENTALSingle doses of GLPG3667 at up to 6 dose levels in ascending order
Placebo SADPLACEBO_COMPARATORSingle doses of placebo
GLPG3667 MADEXPERIMENTALMultiple doses of GLPG3667 at up to 3 dose levels in ascending order, daily for 13 days
Placebo MADPLACEBO_COMPARATORMultiple doses of placebo
GLPG3667 FE fastedEXPERIMENTALSingle dose of GLPG3667 in fasted state
GLPG3667 FE fedEXPERIMENTALSingle dose of GLPG3667 in fed state
GLPG3667 oral suspension rBA-FE fedEXPERIMENTALSingle dose of GLPG3667 oral suspension in fed state
GLPG3667 capsules rBA-FE fastedEXPERIMENTALSingle dose of GLPG3667 capsules in fasted state
GLPG3667 capsules rBA-FE fedEXPERIMENTALSingle dose of GLPG3667 capsules in fed state

Interventions

NameTypeDescription
GLPG3667DRUGCapsule
PlaceboDRUGCapsule
GLPG3667 capsuleDRUGOn Day 1, participants will receive a single oral dose of GLPG3667
[14C]-GLPG3667 solution for infusionDRUGOn Day 1, participants will receive a single microtracer microdose of \[14C\]-GLPG3667 as an intravenous infusion
[14C]-GLPG3667 capsuleDRUGOn Day 1, participants will receive a single oral dose of \[14C\]-GLPG3667
ItraconazoleDRUGOn days 5 to 11, participants will receive itraconazole once daily
MidazolamDRUGOn Day 1 and Day 7 as liquid formulation, orally in fed state.
GLPG3667 oral suspensionDRUGGLPG3667 oral suspension
PlacebosDRUGPlacebo oral suspension
GLPG3667 capsulesDRUGGLPG3667 capsules
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Eligibility Criteria

Age Range18 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites84

Key Inclusion Criteria: 1. Participant with documented diagnosis of SLE as defined by the 2019 European League Against Rheumatism (EULAR)/American College of Rheumatology (ACR) classification criteria with a disease diagnosed ≥24 weeks before the screening visit. 2. Participant has a total Systemic...

Countries:United StatesArgentinaBulgariaChileFranceGeorgiaGermanyHungaryPeruPolandPuerto RicoSpainBelgiumColombiaCroatiaCzechiaItalyMexicoRomaniaUnited KingdomCanadaSlovakia
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