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Study of Safety, Tolerability and Efficacy of PBGM01 in Pediatric Participants With GM1 Gangliosidosis | Clinical Trials | Clareo Health

ACTIVE_NOT_RECRUITINGPHASE1/PHASE2

Study of Safety, Tolerability and Efficacy of PBGM01 in Pediatric Participants With GM1 Gangliosidosis

Phase 1/2 Open-Label, Multicenter Study to Assess the Safety, Tolerability and Efficacy of a Single Dose of PBGM01 Delivered Into the Cisterna Magna of Pediatric Type 1 (Early Onset) and Type 2a (Late Onset) Infantile GM1 Gangliosidosis

NCT04713475•Gemma Biotherapeutics

View on ClinicalTrials.gov

Summary

PBGM01 is a gene therapy for GM1 gangliosidosis intended to deliver a functional copy of the GLB1 gene to the brain and peripheral tissues. This study will assess in a 2 part design the safety, tolerability and efficacy of PBGM01 in patients with early onset infantile (Type 1) and late onset infantile (Type 2a) GM1 gangliosidosis

Detailed Description

GM1 gangliosidosis (GM1) is an autosomal recessive disorder that results from mutations in the galactosidase beta 1 gene (GLB1), which encodes beta-galactosidase (β-gal). β-gal is a lysosomal enzyme that catalyzes the first step in the degradation of GM1 ganglioside and keratan sulfate, and GM1 patients carry GLB1 alleles that produce little or no residual β-gal activity. PBGM01 is an adeno-associated viral vector serotype hu68 carrying GLB1, the gene encoding for human beta-galactosidase, formulated as a solution for injection into the cisterna magna. This is a global interventional, multicenter, single-arm, dose escalation, adaptive design study of PBGM01 delivered as a one-time dose administered into the cisterna magna to patients with early onset infantile (Type 1) and late onset infantile (Type 2a) GM1 gangliosidosis. In Part 1 of the study, the dose-escalation phase will assess three dose levels of PBGM01 as a one-time dose in six independent cohorts of patients with either Type 1 or Type 2a GM1 gangliosidosis. The cohorts for patients with Type 1 and Type 2a will be assessed independently from each other. Part 2 of the study will test the safety and efficacy of PBGM01 in confirmatory cohorts for Types 1 and Type 2a GM1 gangliosidosis with a dose chosen based on the data obtained in part 1 of the study. This will be a 2-year study with a 3-year safety extension.

Eligibility

Age

0 - 2 years

Sex

ALL

Healthy Volunteers

Inclusion Criteria

•All Patients: Documented GM1 gangliosidosis diagnosis based on genotyping confirming 2 mutations in the GLB1 gene and documented deficiency of beta-galactosidase enzyme by laboratory testing.
•Early onset infantile (Type 1) must be ≥1 month and \<12 months of age at enrollment and have signs and/or symptoms of GM1 gangliosidosis that started before 6 months of age with specific minimum developmental milestones remaining.
•Late onset infantile (Type 2a) must be ≥6 months and ≤24 months of age at enrollment and have signs and/or symptoms of GM1 gangliosidosis that started between 6 and 18 months of age with specific minimum developmental milestones remaining including the ability to sit independently at screening as defined by the WHO Multicenter Growth Reference Study (WHO-MGRS) criteria of being able to sit up unsupported with head erect for at least 10 seconds.

Exclusion Criteria

•1. Any clinically significant neurocognitive deficit not attributable to GM1 gangliosidosis or any other condition that may, in the opinion of the investigator, confound interpretation of study results.
•2. If a subject had an acute illness requiring hospitalization within 30 days of enrollment, the history must be discussed with the sponsor's medical monitor before allowing the subject to be enrolled.
•3. History of ventilation assisted respiratory support or a need for tracheostomy as a result of their disease. Chronic ventilatory support is defined as use of invasive or noninvasive (BiPAP) mechanical ventilation. Note: This does not exclude participants who use respiratory vests or noninvasive (BiPAP) mechanical ventilation for obstructive sleep apnea regardless of cause for less than 12 hours per day.
•4. Intractable seizure or uncontrolled epilepsy defined as having had an episode of status epilepticus, or seizures requiring hospitalization within 30 days prior to dosing of PBGM01. Note: This does not exclude participants who have a history of staring spells that have not been associated with EEG findings.
•5. Any contraindication to the ICM administration procedure, including contraindications to fluoroscopic imaging and anesthesia or any condition that would increase the risk of adverse outcomes from the ICM procedure including, but not limited to, the presence of a space occupying lesion causing mass effects or signs of increased intracranial pressure, space occupying lesion in the posterior fossa or foramen magnum, aberrant vascular anatomy such as a large midline posterior inferior cerebellar artery, aberrant venous anatomy such as a large cerebellar vein or occipital sinus, or congenital anatomical abnormalities such as a Chiari malformation.
•6. Any contraindication to MRI or lumbar puncture (LP).
•7. Prior gene therapy.
•8. Use of miglustat within 48 hours prior to dosing of PBGM01. The use of miglustat is prohibited throughout the study.
•9. Use of enzyme replacement therapy or other investigational therapy within 5 half-lives prior to dosing of PBGM01. The use of enzyme replacement is prohibited throughout the study.
•10. Receipt of a vaccine within 14 days prior to dosing and/or scheduled vaccine within 30 days after dosing.
+8 more criteria

Locations (7)

Benioff Children's Hospital

Oakland, California, United States

University of Minnesota

Minneapolis, Minnesota, United States

Children's Hospital at St. Peter's University Hospital

New Brunswick, New Jersey, United States

The Children's Hospital of Philadelphia

Philadelphia, Pennsylvania, United States

Hospital de Clínicas de Porto Alegre (HCPA)

Porto Alegre, Brazil

Gazi University

Ankara, Turkey (Türkiye)

Great Ormond Street Hospital

London, United Kingdom

Key Dates

Start Date

March 17, 2021

Primary Completion Date

February 1, 2026

Completion Date

February 1, 2029

Last Updated

May 21, 2025

Enrollment

ESTIMATED participants

Conditions

GM1 GangliosidosisGM1 Gangliosidosis, Type IGM1 Gangliosidosis, Type 2Beta-Galactosidase-1 (GLB1) Deficiency

Interventions

PBGM01

BIOLOGICAL

A Phase I Study of Prenatal Intravenous Gene Transfer With an AAV9 Vector Expressing Human Beta-galactosidase in Type I and Type II GM1 Gangliosidosis

NCT07479953

GM1 GangliosidosesGM1 Gangliosidosis, Type I+1 more

View study

Data Source & Attribution

This clinical trial information is sourced from ClinicalTrials.gov, a service of the U.S. National Institutes of Health.

ClinicalTrials.gov last update: May 21, 2025Data synced to Clareo: March 29, 2026

Modifications: This data has been reformatted for display purposes. Eligibility criteria have been parsed into inclusion/exclusion sections. Location data has been geocoded to enable distance-based search. For the authoritative and most current information, please visit ClinicalTrials.gov.

Neither the United States Government nor Clareo Health make any warranties regarding the data. Check ClinicalTrials.gov frequently for updates.

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