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vilamakitug

Phase 2

Axial Spondyloarthritis | Small molecule | Other |XBiotech Inc.|Last Updated: May 14, 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-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment150
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06526377Vilamakitug in Spondyloarthritis Placebo-controlled Investigation for EfficacyPHASE2 NOT YET_RECRUITING 150Sep 1, 2026Sep 1, 2028May 14, 2026 -
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Study Endpoints
Primary Endpoints
Percentage of participants achieving ASAS40.
Baseline to week 16

ASAS40 response is defined at least a 40% improvement in at least three of the four main ASAS domains, with no worsening in the remaining domain: Patient Global Assessment of Disease Activity (Q3 of ASDAS-CRP), Pain Assessment (BASDAI Q2), physical function (Bath Ankylosing Spondylitis Functional Index \[BASFI\]), and Inflammation (represented by the mean of the two morning stiffness BASDAI questions Q5 and Q6).

Secondary Endpoints
Patient Global Assessment of Disease Activity (PGADA) using Q3 of ASDAS-CRP
Baseline to week 16
Spinal pain [Numeric Rating Scale (NRS) using Question 2 of Bath Ankylosing Spondylitis Disease Activity Index (BASDAI)]
Baseline to week 16
Physical function using Bath Ankylosing Spondylitis Functional Index (BASFI)
Baseline to week 16
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
vilamakitugEXPERIMENTALweekly dose of vilamakitug
placeboPLACEBO_COMPARATORplacebo
Interventions
NameTypeDescription
vilamakitugDRUGVilamakitug is a monoclonal antibody preparation, indistinguishable from a natural antibody isolated from a healthy human.
placeboDRUGplacebo
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Eligibility Criteria
Age Range18 Years — 65 Years
SexALL
Healthy VolunteersNo

Inclusion Criteria: 1. Male or female aged ≥18 and ≤65 years, with body weight \>40 kg at screening, who are willing to provide informed consent, attend all clinic visits, comply with study-related procedures and able to understand and complete study-related questionnaires. 2. Must meet the ASAS-SP...

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Recent Changes (Last 90 Days)
MEDIUMMay 26, 2026NCT06526377Enrollment: 60 → 150
LOWMay 24, 2026NCT06526377studyFirstPostDate: changed