- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04669535
A Dose-escalation and Safety & Efficacy Study of AXO-AAV-GM2 in Tay-Sachs or Sandhoff Disease
A Two-Stage, Dose-Escalation and Safety & Efficacy Study of Bilateral Intraparenchymal Thalamic and Intracisternal/Intrathecal Administration of AXO-AAV-GM2 in Tay-Sachs or Sandhoff Disease
The AXO-GM2-001 study is an open-label, two-stage clinical trial designed to evaluate safety and dose-escalation (Stage 1) and safety and efficacy (Stage 2) of a bilateral thalamic and intracisternal/intrathecal infusion of AXO-AAV-GM2 in pediatric participants with GM2 Gangliosidosis (also known as Tay-Sachs or Sandhoff Diseases), a set of rare and fatal pediatric neurodegenerative genetic disorders caused by defects in the HEXA (leading to Tay-Sachs disease) or HEXB (leading to Sandhoff disease) genes that encode the two subunits of the β-hexosaminidase A (HexA) enzyme. AXO-AAV-GM2 is an investigational gene therapy that aims to restore HexA function by introducing a functional copy of the HEXA and HEXB genes via co-administration of two vectors utilizing the neurotropic adeno-associated virus recombinant human 8 serotype (AAVrh.8) capsid carrying the human HEXA or HEXB cDNA.
The trial is expected to enroll pediatric participants with Tay-Sachs or Sandhoff Diseases, where infantile-onset participants will range from 6 months to 20 months old, and juvenile-onset participants will range from 2 years to 12 years old.
Study Overview
Status
Conditions
Study Type
Enrollment (Estimated)
Phase
- Phase 1
Contacts and Locations
Study Locations
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Massachusetts
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Boston, Massachusetts, United States, 02114
- Massachusetts General Hospital, Center for Rare Neurological Diseases
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Worcester, Massachusetts, United States, 01655
- University of Massachusetts Medical Health Center
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Description
Inclusion Criteria:
Male or female participants with genetically diagnosed TSD or SD mutations of either HEXA gene or HEXB gene
a. Stage 1 juvenile-onset participants must be ≥ 2 years old and ≤ 12 years old at time of gene transfer i. Diagnosis consistent with juvenile-onset TSD or SD b. Stage 1 infantile-onset participants must be between 6-20 months of age at the time of gene transfer i. Diagnosis consistent with infantile-onset TSD or SD
Juvenile onset participants must demonstrate a minimum of 2 of the following age-appropriate clinical features/abilities, confirmed by the site examiner at the time of screening and reaffirmed prior to the initiation of immunosuppression:
- A Gross Motor Function Classification-MLD (GMFC-MLD) score of 0, 1 or 2. The minimum gross motor function (GMFC-MLD level 2) is the 'ability to walk with support and walking without support is not possible (fewer than 5 steps)'. (Participants aged 2-12 years) Note: Any form of support is permitted; however, the participant must initiate each step and complete it for a total of 5 steps.
Fine Motor Function
- For Participants aged 4-12 years: A Manual Ability Classification System (MACS) score of I, II, III, or IV. The minimum level of manual ability (level IV) corresponds to 'Handles a limited selection of easily managed objects in adapted situations'.
- For participants aged 2-4 years: attainment of fine motor function/coordination abilities and milestones with normal or a reduced quality of performance. That is, the ability to coordinate fingers and both hands to play, such as swinging a bat or opening a container (pathways.org) OR the ability to use fingertips to pick up small objects, i.e., the child uses pad of his/her thumb and any fingertip to grasp a pellet or small object as described in BSID III Fine Motor Sub-test Item #26. .
Speech:
- For participants aged 4-12 years, a speech disturbance score of 0, 1, 2 or 3 on the speech disturbance subset of the Scale for Assessment and Rating of Ataxia (SARA). The minimum speech requirement is a speech disturbance in which most words can be understood, with occasional words difficult to understand secondary to dysarthria.
- Participants aged 2-4 years who have attained the communication milestone of ability to consistently use 2-3 word phrases may be assessed in line with this criterion using the speech disturbance subset of the SARA.
- For participants aged 2-4 years who have not yet attained the above communication milestone, the minimum requirement is the ability to imitate at least one word, even if the imitation consists of vowels only (BSID III, expressive communication subtest, item #16)
Infantile onset participants must demonstrate current* or historical† ability to sit without support for at least 5 seconds
* As assessed in item 22 of the Bayley Scales of Infant and Toddler Development, Third Edition (BSID-III) Gross Motor Scale or documented medical records
† Documented within available medical records
In addition, infantile onset participants must demonstrate a minimum of 3 of the following developmental skills confirmed by the site examiner at the time of screening and reaffirmed prior to the initiation of immunosuppression:
- Head control - While supine, with head in midline turns head symmetrically (score of 3 on GMFM item 1)
- Uses hands to support self while sitting
- Reach for an object that is held out for them above their chest while supine
- Transfer of object from hand to hand while supine
- Eye tracking while supine
- Looks at an object of interest for at least 3 continuous seconds
Surgical readiness for gene transfer by the routes of administration confirmed by the study neurosurgeon*, based on examination and MRI findings
The following findings will disallow the performance of the BiTh procedure thereby excluding the participant from participation:
- Any scalp and skull related lesion (e.g., vascular, infectious) over the surgical entry area
- Any intracranial lesion (e.g., vascular, cystic, other mass lesions), significant immaturity or deformity of the brain anatomy that would make the intended surgical trajectory high risk
The following findings will disallow the performance of the ICM/IT procedure thereby excluding the participant from participation:
- Any skin related lesion (e.g., vascular, infectious) over the lumbar puncture site
- Any intraspinal or intracranial lesion in posterior fossa (e.g., vascular, cystic, other mass lesions) or significantly deformed, distorted brain, spinal and cisternal anatomy that make the intended intrathecal trajectory high risk or not feasible * Participants otherwise eligible for study participation but deemed not currently fit for neurosurgery may be re-screened at the discretion of the investigator
- Participants receiving off-label Zavesca® (miglustat) and/or Tanganil® (acetyl-leucine) must be willing to discontinue these therapies 30 days prior to the start of screening
- Ability to reliably travel to the study sites for study visits according to the Schedule of Assessments
Exclusion Criteria:
- Presence of G269S or W474C mutation in HEXA
- Evidence of lower respiratory tract aspiration not easily manageable with thickening of feedings or substitution of a modified bottle nipple, as judged on a multi-texture contrast swallow.
- History of multiple aspiration pneumonias occurring in the past twelve months.
- Respiratory support in the form of ventilation (invasive or non-invasive).
- History of drug-resistant seizures or status epilepticus
History and/or findings of spinal cord disease that would preclude the lumbar puncture and ICM/IT infusion procedures including:
- Infectious process involving the spinal canal which may cause adhesions or septations in the spinal and/or subarachnoid space
- Previous spinal surgeries
- History of trauma, bleeding in the spinal canal
- Vascular or cystic lesions, or any other mass lesion
- Congenital deformities and malformations involving the spinal canal
- Posterior fossa findings (low lying cerebellar tonsils, crowded foramen magnum, small or absent cisterna manga)
- The participant's parent(s) or legal guardian(s) is unable to understand the nature, scope, and possible consequences of the study, or does not agree to comply with the protocol-defined schedule of assessments
- Any prior participation in a study in which a gene therapy vector or stem cell transplantation was administered
- Immunizations of any kind in the month prior to screening
- Cardiomyopathy or other cardiac disease based on echocardiogram and/or electrocardiogram, (ECG) that in the opinion of the Investigator would deem the participant unsafe to undergo surgical gene transfer
- Indwelling ferromagnetic devices that would preclude MRI//MRS/DTI imaging
- Ongoing medical condition that is deemed by the Investigator to interfere with the conduct or assessments of the study
- Current clinically significant infections including any requiring systemic treatment including but not limited to human immunodeficiency virus (HIV), Hepatitis A, B, or C
- History of or current chemotherapy, radiotherapy or other immunosuppressive therapy within the past 30 days. Corticosteroid treatment may be permitted at the discretion of the PI
Clinically significant laboratory abnormalities:
Based on age-specific reference range and determined by the investigator:
- Total WBC count
- Hemoglobin
- Creatinine
- Pancreatic enzymes
Based on the following thresholds:
- Platelet count (< 150,000/μL)
- Prothrombin (PT), partial thromboplastin time (PTT) >2X normal
- Liver transaminases (Hy's Law: > 3x elevations above the ULN of ALT or AST and serum total bilirubin > 2xULN)
- Participants for whom any of the proposed study procedures or medications (i.e., sirolimus, trimethoprim/sulfamethoxazole) would be contraindicated
- Failure to thrive, defined as falling 20 percentiles (20/100) in body weight in the 3 months preceding Screening/Baseline
- Participant is not suitable for participation in the study in the opinion of the Principal Investigator
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
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Experimental: AXO-AAV-GM2
AXO-AAV-GM2 infusion
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1:1 ratio of AAVrh8-HEXA and AAVrh8-HEXB, administered via bilateral thalamic (BiTh) and dual intracisterna magna (ICM)/intrathecal (IT) administration into the cerebrospinal fluid (CSF).
Other Names:
1:1 ratio of AAVrh8-HEXA and AAVrh8-HEXB, administered via bilateral thalamic (BiTh) and dual intracisterna magna (ICM)/intrathecal (IT) administration into the cerebrospinal fluid (CSF).
Other Names:
1:1 ratio of AAVrh8-HEXA and AAVrh8-HEXB, administered via bilateral thalamic (BiTh) and dual intracisterna magna (ICM)/intrathecal (IT) administration into the cerebrospinal fluid (CSF).
Other Names:
1:1 ratio of AAVrh8-HEXA and AAVrh8-HEXB, administered via bilateral thalamic (BiTh) and dual intracisterna magna (ICM)/intrathecal (IT) administration into the cerebrospinal fluid (CSF).
Other Names:
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Incidence, severity, seriousness and relatedness to treatment of treatment emergent adverse events
Time Frame: 48 weeks (infantile-onset participants) to 96 weeks (juvenile-onset participants)
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48 weeks (infantile-onset participants) to 96 weeks (juvenile-onset participants)
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Secondary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Number of participants with abnormal vital signs
Time Frame: 48 weeks (infantile-onset participants) to 96 weeks (juvenile-onset participants)
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48 weeks (infantile-onset participants) to 96 weeks (juvenile-onset participants)
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Number of participants with abnormal physical exam per investigator assessment
Time Frame: 48 weeks (infantile-onset participants) to 96 weeks (juvenile-onset participants)
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48 weeks (infantile-onset participants) to 96 weeks (juvenile-onset participants)
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Number of participants with abnormal clinical safety laboratory tests on blood/urine/CSF
Time Frame: 48 weeks (infantile-onset participants) to 96 weeks (juvenile-onset participants)
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48 weeks (infantile-onset participants) to 96 weeks (juvenile-onset participants)
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Electroencephalograms alpha, beta, delta, and theta wave frequencies (Hz)
Time Frame: 48 weeks (infantile-onset participants) to 96 weeks (juvenile-onset participants)
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48 weeks (infantile-onset participants) to 96 weeks (juvenile-onset participants)
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Serum cellular and antibody immune response to vector capsid/transgene
Time Frame: 48 weeks (infantile-onset participants) to 96 weeks (juvenile-onset participants)
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48 weeks (infantile-onset participants) to 96 weeks (juvenile-onset participants)
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Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Terence Flotte, MD, University of Massachusetts Medical Health Center
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
- Metabolic Diseases
- Brain Diseases
- Central Nervous System Diseases
- Nervous System Diseases
- Genetic Diseases, Inborn
- Metabolism, Inborn Errors
- Lysosomal Storage Diseases
- Lipid Metabolism Disorders
- Brain Diseases, Metabolic
- Brain Diseases, Metabolic, Inborn
- Sphingolipidoses
- Lysosomal Storage Diseases, Nervous System
- Lipidoses
- Lipid Metabolism, Inborn Errors
- Gangliosidoses, GM2
- Gangliosidoses
- Tay-Sachs Disease
- Sandhoff Disease
Other Study ID Numbers
- AXO-GM2-001
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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