An Early Clinical Trial to Evaluate VGN-R09b for Treatment of Aromatic L-amino Acid Decarboxylase (AADC) Deficiency.

Early Phase 1

Recruiting

• Conditions: Aromatic L-amino Acid Decarboxylase (AADC) Deficiency
• Interventions: Drug: VGN-R09b

• Registration Number: NCT05765981
• Lead Sponsor: Shanghai Jiao Tong University School of Medicine

Brief Summary

This early Phase trial is to prove the safety and efficacy of VGN-R09b to treat patients with AADC deficiency.

Detailed Description

Aromatic L-amino acid decarboxylase (AADC) is an enzyme responsible for the final step in the synthesis of neurotransmitters dopamine and serotonin. AADC deficiency is a rare genetic disorder. VGN-R09b is a kind of Gene therapy with adeno-associated virus (AAV) serotype 9 (AAV9) driven human AADC (hAADC) being injected directly into striatum.

This is a single-center, open, dose-climbing investigator-sponsored early-stage clinical study that included a dose-climbing phase and a dose-expanding phase.

This study is to give preliminary evidence for the safety and efficacy of VGN-R09b treatment for patients with Aromatic L-amino acid decarboxylase (AADC) deficiency.

Study Timeline

• Study First Submitted: 2023-01-18
• Study Start: 2023-01-30
• Status Verified: 2023-03
• Study First Submitted QC: 2023-03-09
• Last Update Submitted: 2023-03-09
• Study First Posted: 2023-03-13
• Last Update Posted: 2023-03-13
• Primary Completion: 2025-02-20
• Study Completion: 2029-02-20

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 6

Inclusion Criteria

1. The child patient has to be ≥2 years old and < 8 years old, or a head circumference big enough for surgery.
2. Historical diagnosis of AADC deficiency with clinical symptoms consistency, AND confirmed by one of the lab tests: (1) CSF neurotransmitter profile demonstrating reduced HVA and 5-HIAA, and elevated L-Dopa concentrations; (2) Plasma AADC activity less than or equal to 5 pmol/min/mL, AND with Molecular genetic confirmation of homozygous or compound heterozygous mutation of IVS6+4A>T in DDC.
3. Motor development at baseline ≤3 months, and Failed to benefit from standard medical therapy (dopamine agonists, monoamine oxidase inhibitor or related form of Vitamin B6) at discretion of investigators.
4. Stable medication regimen for treatment of AADC deficiency: (i.e. no new medications introduced for at least 6 months, and no existing medication dose changes for at least 3 months prior to Baseline).
5. Parent(s)/legal guardian(s) with custody of subject must give their consent for subject to enroll in the study
6. Parent(s)/legal guardian(s) of the subject must agree to comply with the requirements of the study, including providing disease information and support disease assessment of symptoms.

Exclusion Criteria

1. Intracranial neoplasm or any structural brain abnormality or lesion (e.g., severe brain atrophy, white matter degenerative changes), which, in the opinion of the study investigators, would confer excessive risk and/or inadequate potential for benefit.
2. Presence of other significant medical or neurological conditions that would create an unacceptable operative or anesthetic risk (including congenital heart disease, respiratory disease with home oxygen requirement, history of serious anesthesia complications during previous elective procedures, history of cardiorespiratory arrest), liver or renal failure, malignancy, or HIV positive.
3. Severe coagulopathy, or need for ongoing anticoagulant therapy.
4. clinically active infection or with severe infection within 12 weeks before screening (e.g. adenovirus or herpes virus, pneumonia, sepsis, central nervous system infection).
5. Previous stereotactic neurosurgery, or any gene/cell therapy.
6. Received live vaccination within 4 weeks.
7. Patients with anti-AAV9 neutralizing antibody titer over 1,200 folds.
8. Contraindication to sedation during surgery or imaging studies (PET or MRI).

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Aromatic L-amino acid decarboxylase (AADC) deficiency	VGN-R09b	This early Phase trial is to prove the safety and efficacy of VGN-R09b to treat patients with AADC deficiency.

Primary Outcome Measures

Name	Time	Method
Number of Adverse Events (AEs), Serious Adverse Events (SAEs)	Week 52	Number of Adverse Events (AEs), Serious Adverse Events (SAEs)
Achievement Ratio of the four motor development milestones (Head control, Sit independently, Stand/stepping with support and Walk with minimal assistant)	Week 52	Achievement Ratio of the four motor development milestones (Head control, Sit independently, Stand/stepping with support and Walk with minimal assistant) according to PDMS-II score.

Trial Locations

Locations (1)

Shanghai Children's Medical Center Affiliated to Shanghai Jiao Tong University School of Medicine; 🇨🇳 Shanghai, No. 1678, Dongfang Road, Pudong New Area, Shanghai, China