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Adjuvant Immunomodulatory Therapy

Phase 3

Mucopolysaccharidosis IIIA | Small molecule | Rare Disease |Ultragenyx Pharmaceutical Inc.|Last Updated: Apr 24, 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
CONTROLLEDDMC
Total Trials1
Total Enrollment41
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT04360265Follow-up Study of AAV-Mediated Gene Transfer (UX111; Previously Known as ABO-102) for MPS Type IIIAPHASE3 ENROLLING BY_INVITATION 41Sep 28, 2020Aug 1, 2027Apr 24, 20264 United States, Australia +1
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Study Endpoints
Primary Endpoints
Number of Participants with Treatment-Emergent Adverse Events (TEAEs) and Treatment-Emergent Serious Adverse Events (SAEs)
Up to Year 5
Bayley Scales of Infant and Toddler Development - Third Edition (BSITD-III) Cognitive Raw Score Over Time
Up to Year 5
Secondary Endpoints
Cerebrospinal Fluid (CSF) Heparin Sulfate (HS) (Disaccharide) Exposure
Baseline, Up to Month 36
Percent Change From Baseline in Prior Trial in CSF HS
Baseline, Up to Month 36
BSITD-III Receptive Communication Raw Score Over Time
Up to Year 5
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeOTHER
Treatment Arms
ArmTypeDescription
Cohort AOTHERParticipants who have participated in a prior clinical trial involving the administration of UX111 (rebisufligene etisparvovec) and are able to comply with onsite scheduled visits and assessments. Select participants may receive adjuvant IM therapy.
Cohort BOTHERParticipants who have participated in a prior clinical trial involving the administration of UX111 (rebisufligene etisparvovec) and who cannot participate in Cohort A. Participants will partake in a reduced number of assessments, performed either onsite or at home via a combination of telehealth and home healthcare visits.
Interventions
NameTypeDescription
No Investigational ProductOTHERNo investigational product will be administered in this follow-up trial.
Adjuvant Immunomodulatory (IM) TherapyDRUGThe Principal Investigator and/or caregiver, in consultation with the medical monitor, will determine whether to initiate adjuvant IM therapy. Not all participants may receive IM therapy.
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Eligibility Criteria
SexALL
Healthy VolunteersNo
Study Sites4

Inclusion Criteria: * Participants that have participated in a prior clinical trial in which they received UX111 * Parent(s)/legal guardian(s) of participant willing and able to complete the informed consent process and comply with study procedures and visit schedule Exclusion Criteria: * Planned...

Countries:United StatesAustraliaSpain
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT04360265primaryCompletionDate: changed
LOWMay 24, 2026NCT04360265studyFirstPostDate: changed