A Single-Stage, Adaptive, Open-label, Dose Escalation Safety and Efficacy Study of AADC Deficiency in Pediatric Patients

Conditions

• AADC Deficiency

Eligibility Criteria

Sex

ALL

Age

24 Months - N/A

Healthy Volunteers

Not accepted

Interventions

• AAV2-hAADC — DRUG
  Initially, subjects will be enrolled sequentially into 2 dose groups. 3 subjects will be enrolled in Cohort 1 and treated with a single dose of AAV2 hAADC (1.3x10 11 vg, delivered as infusate volume of up to 160μL of vector at concentration of 8.3x10 11 vg/mL) on Day 0. Enrollment in Cohort 2 may commence after the last subject in Cohort 1 is treated and followed through Month 3 post-op, with approval of the data safety monitoring board (DSMB). Cohort 2 will receive a higher dose (4.2 x 10\^11 vg, 160 uL). Upon DSMB review of Cohort 1/2 results, Cohort 3 (4-12 yo) and 4 (aged \>/= 13 yo) will be dosed (1.6 x 10\^12 vg, 60uL) in 1-2 sites bilaterally in-between the SNc and VTA. Cohort 5 will follow (aged 24-47 months) at 1.3 x 10\^12 vg, 500uL. Final safety and clinical outcome assessments will be performed 1 year post-surgery. Follow-up analysis will be performed for 2 years post-op. Subjects will be enrolled in a long-term follow-up study to assess safety and clinical status updates.

Study Details

The overall objective of this study is to determine the safety and efficacy of AAV2-hAADC delivered to the substantia nigra pars compacta (SNc) and ventral tegmental area (VTA) in children with aromatic L-amino acid decarboxylase (AADC) deficiency.

Key Dates

Start date

Jul 1, 2016

Status verified

Aug 2024

Primary completion

Jul 31, 2027

Completion

Jul 31, 2031

Study Design

Enrollment

42 participants (estimated)

Allocation

NA

Intervention model

SINGLE_GROUP

Primary purpose

TREATMENT

Arms

• Experimental: Single treatment arm
  Single-stage dose-escalation, open-label safety study of AAV2-hAADC delivered by image-guided convection-enhanced delivery bilaterally into the substantia nigra pars compacta and the ventral tegmental area of pediatric patients with AADC deficiency. Primary aim is to determine the dose for future studies based on safety, biomarkers of pharmacological activity of AADC and clinical outcomes. Cohort 1 (3 subjects) will receive a single low dose of AAV2 hAADC. The total AAV2-hAADC dose will be infused via MR guided infusion into 4 sites in both the left and right SNc and VTA. Dose intervals will be 90 days between the first 3 subjects. Cohort 2 dose (4 subjects) will be determined by Cohort 1 results. Following Cohort 2, Cohort 3/4 will be dose and divided divided by age. Cohorts 3/4 will receive the same dose by MR guided infusion to 1-2 sites bilaterally in-between the SNc and VTA. Cohort 5 (24-47mo old) will have same vector concentration and lower volume of infusion than Cohorts 3/4

Primary Outcome Measure

Adverse events related to surgery and gene transfer [ Time Frame: 2 years ]

Central Contacts

• Andrea Davis, MS
  614-688-6412
  [email protected]

Locations (3)

Find similar trials in San Francisco, CA