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Adjuvant Immunomodulatory Therapy

Phase 3

Mucopolysaccharidosis IIIA | Small molecule | Rare Disease |Ultragenyx Pharmaceutical Inc.|Last Updated: Jul 17, 2026

Target and mechanism

ModalitySmall molecule

Also known as Adjuvant Immunomodulatory (IM) Therapy

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMC
Total Trials1
Total Enrollment41

FDA Designations

No designations recorded

Clinical trial landscape

Adjuvant Immunomodulatory Therapy · 1 trial · 4 indications

Phase 3 1
NCT04360265Follow-up Study of AAV-Mediated Gene Transfer (UX111; Previously Known as ABO-102) for MPS Type IIIAMucopolysaccharidosis IIIA
ENROLLING BY_INVITATION41 Analytics
PHASE3ENROLLING BY_INVITATION
Follow-up Study of AAV-Mediated Gene Transfer (UX111; Previously Known as ABO-102) for MPS Type IIIA
Mucopolysaccharidosis IIIAUnlock trial analytics

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)

LOWJul 17, 2026NCT04360265lastUpdatePostDate: changed
LOWJul 17, 2026NCT04360265lastUpdatePostDate: changed

Frequently asked questions about Adjuvant Immunomodulatory Therapy

What is Adjuvant Immunomodulatory Therapy used for in Mucopolysaccharidosis IIIA?

Adjuvant Immunomodulatory Therapy is an investigational small molecule being studied for use in Mucopolysaccharidosis IIIA, also known as MPS IIIA or Sanfilippo syndrome type A. It is being evaluated as part of a Phase 3 clinical trial in combination with gene transfer therapy for this rare genetic condition.

Who is developing Adjuvant Immunomodulatory Therapy?

Adjuvant Immunomodulatory Therapy is being developed by Ultragenyx Pharmaceutical Inc., a biopharmaceutical company traded on NASDAQ under the ticker RARE. The company is investigating this therapy in the context of a Phase 3 clinical trial for Mucopolysaccharidosis IIIA.

What phase is Adjuvant Immunomodulatory Therapy in?

Adjuvant Immunomodulatory Therapy is currently in Phase 3 clinical development. It is an investigational therapy, meaning it has not been approved by regulatory authorities and is still being studied in clinical trials for Mucopolysaccharidosis IIIA.

What clinical trials is Adjuvant Immunomodulatory Therapy in?

Adjuvant Immunomodulatory Therapy is being studied in one Phase 3 clinical trial with the identifier NCT04360265. This trial is a follow-up study of AAV-mediated gene transfer (UX111, previously known as ABO-102) for MPS type IIIA, enrolling 41 participants in the United States, Australia, and Spain.

Is Adjuvant Immunomodulatory Therapy the same as Adjuvant Immunomodulatory (IM) Therapy?

Yes, Adjuvant Immunomodulatory Therapy is also known as Adjuvant Immunomodulatory (IM) Therapy. These names refer to the same investigational therapy being developed by Ultragenyx Pharmaceutical Inc. for use in Mucopolysaccharidosis IIIA.

How does Adjuvant Immunomodulatory Therapy work?

Adjuvant Immunomodulatory Therapy is a small molecule designed to modulate the immune system. It is being studied as an adjuvant to gene transfer therapy, potentially helping to manage immune responses during treatment for Mucopolysaccharidosis IIIA. The specific molecular target has not been disclosed.