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Tralesinidase alfa

Phase 3

MPS IIIB | Small molecule | Other |Spruce Biosciences, Inc.|Trials Updated: Sep 21, 2026

Tralesinidase alfa target and mechanism

Molecular targetIGF2/ NAGLU
ModalitySmall molecule

Also known as Tralesinidase alfa (TA)

Success Probability

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Market & Valuation

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Trial Design

RandomizedNO_TREATMENT_CONTROLLED
Total Trials1
Total Enrollment14

FDA Designations

BREAKTHROUGH_THERAPYRARE_PEDIATRIC_DISEASEFAST_TRACKORPHAN_DRUG

Tralesinidase alfa clinical trials

Tralesinidase alfa · 1 trial · 1 indication

Phase 3 1
NCT07579910Intracerebroventricular Tralesinidase Alfa in Participants With MPS IIIB (Sanfilippo Syndrome Type B)MPS IIIB
NOT YET_RECRUITING14 Analytics
PHASE3NOT YET_RECRUITING
Intracerebroventricular Tralesinidase Alfa in Participants With MPS IIIB (Sanfilippo Syndrome Type B)
MPS IIIBUnlock trial analytics

Study Endpoints

Primary Endpoints

Change from Baseline in Bayley Scales of Infant and Toddler Development, Third Edition, Cognition Domain (BSID-III-C) Raw Score
Baseline to Week 260 (approximately 5 years)

The BSID-III-C is a standardized tool that evaluates cognitive development in young children, capturing skills such as processing speed, problem solving, and play. Raw scores are used to sensitively measure individual change over time, independent of age. Assessments are administered by a trained, blinded rater and reviewed by a central blinded rater. The endpoint is the difference in mean change from baseline in BSID-III-C raw score between the tralesinidase alfa and control arms at Week 260

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Study Design & Arms

AllocationRANDOMIZED
MaskingSINGLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Tralesinidase alfa (TA)EXPERIMENTAL -
ControlNO_INTERVENTION -

Interventions

NameTypeDescription
Tralesinidase alfa (TA)DRUGTA study drug is a sterile solution for ICV infusion.
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Eligibility Criteria

Age Range1 Year to 5 Years
SexALL
Healthy VolunteersNo

Inclusion Criteria: Has a diagnosis of MPS IIIB confirmed by deficient NAGLU enzyme activity during screening. Has nonattenuated severe MPS IIIB by the Genotype and Clinical Assessment Committee. Is ≥1 and ≤5 years of age with BSID-III-C raw score of \<70. Is male or female as identified at birth...

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Recent Changes (Last 90 Days)

LOWSep 21, 2026NCT07579910lastUpdatePostDate: changed
LOWSep 21, 2026NCT07579910lastUpdatePostDate: changed
LOWJul 30, 2026NCT07579910lastUpdatePostDate: changed
LOWJul 30, 2026NCT07579910lastUpdatePostDate: changed

Frequently asked questions about Tralesinidase alfa

What is tralesinidase alfa used for?

Tralesinidase alfa is an investigational therapy being developed for MPS IIIB, also known as Sanfilippo syndrome type B. It is designed to address the underlying enzyme deficiency in this rare pediatric lysosomal storage disorder. The drug has not been approved by the FDA and remains in clinical development.

What does tralesinidase alfa target?

Tralesinidase alfa targets IGF2/NAGLU. It is designed to deliver a functional form of the NAGLU enzyme, which is deficient in MPS IIIB, by using the IGF2 receptor to enable transport across the blood-brain barrier. This targeted approach aims to address the central nervous system manifestations of the disease.

Who is developing tralesinidase alfa?

Tralesinidase alfa is being developed by Spruce Biosciences, Inc., which trades on the Nasdaq under the ticker SPRB. The company is responsible for the clinical development program of this investigational therapy for MPS IIIB.

What phase is tralesinidase alfa in?

Tralesinidase alfa is in Phase 3 clinical development. It is an investigational drug and has not been approved by the FDA for any indication. The Phase 3 program is ongoing, with one active trial currently listed.

What clinical trials is tralesinidase alfa in?

Tralesinidase alfa is being evaluated in a Phase 3 trial, NCT07579910, titled Intracerebroventricular Tralesinidase Alfa in Participants With MPS IIIB (Sanfilippo Syndrome Type B). The trial has a planned enrollment of 14 participants and is not yet recruiting. It is randomized and uses a no-treatment control.

Is tralesinidase alfa the same as TA?

Yes, tralesinidase alfa is also known as TA. Both names refer to the same investigational therapy being developed by Spruce Biosciences for MPS IIIB. The abbreviation TA is commonly used in reference to tralesinidase alfa.