for people ages 40-75 (full criteria)
at UC Davis UC Irvine UCSF
study started
estimated completion



The objectives of this study are to assess the efficacy, safety and tolerability of VY-AADC02 in Patients with Parkinson's Disease with Motor Fluctuations.

Official Title

A Randomized, Sham Surgery Controlled, Double-blind, Multi-center, Phase 2 Clinical Trial, Evaluating the Efficacy and Safety of VY-AADC02 in Moderate to Advanced Parkinson's Disease Patients With Motor Fluctuations


Parkinson's Disease, Parkinson's Disease (PD), Aromatic L-Amino Acid Decarboxylase, AADC, AAV, VY-AADC02, AAV2-hAADC, DDC, Gene Therapy, Levodopa, Dopamine, Neurosurgery, NBIb-1817, Motor Fluctuations, Parkinson Disease, VY-AADC02 (NBIb-1817)


You can join if…

Open to people ages 40-75

  1. Males and females, 40 to 75 years of age (inclusive)
  2. Diagnosis of PD, consistent with United Kingdom Brain Bank Criteria
  3. Motor responsiveness to dopaminergic therapy, demonstrated by improvement in MDS-UPDRS III score
  4. Disease duration from diagnosis of ≥4 years
  5. An average of ≥3 hours of OFF time (ie, periods of insufficient control of motor PD symptoms) per day over 3 consecutive days as confirmed by the PD Diary
  6. A stable, optimal regimen of Parkinson's medications including levodopa for at least weeks prior to screening evaluation. Participants must have a minimum duration of levodopa treatment of ≥1 year
  7. In the judgment of the Investigator, stable Parkinson's features and symptoms for at least 4 weeks prior to screening evaluation
  8. Agrees to defer any elective neurological surgery, including deep brain stimulation or ablation procedure for PD, levodopa or apomorphine infusion, or the addition of new dopaminergic formulations until after the study is completed, if medically appropriate
  9. Ability to travel to study visits

You CAN'T join if...

  1. Atypical or secondary parkinsonism, including but not limited to symptoms believed to be due to trauma, brain tumor, infection, cerebrovascular disease, other neurological disease, or to drugs, chemicals, or toxins, as determined by the Investigator
  2. MoCA score <26
  3. New or unstable psychiatric conditions (psychosis, depression) within 1 year of screening
  4. Brain imaging abnormalities in the striatum or other regions that would substantially increase risk of surgery
  5. Contraindication to MRI and/or gadolinium-based contrast agents
  6. Prior brain surgery, infusion therapies or planned treatments that could complicate the study procedure or negatively impact study evaluations as determined from participant interview, screening MRI, or medical records
  7. History of malignancy other than treated carcinoma in situ within 3 years of screening evaluation
  8. Prior gene transfer, current treatment with any investigational agent (drug or device) within 2 months of screening evaluation, or participation or plans to participate in another research study
  9. Severe, biphasic and/or uncontrolled dyskinesia

    10. Disabling or uncontrolled impulse control disorders


  • UC Irvine
    Irvine California 92697 United States
  • UC Davis Health System
    Sacramento California 95817 United States
  • San Francisco VA Medical Center
    San Francisco California 94143 United States
  • University of California, San Francisco
    San Francisco California 94143 United States


in progress, not accepting new patients
Start Date
Completion Date
Neurocrine Biosciences
Phase 2 research study
Study Type
Expecting 85 study participants
Last Updated