for people ages 35-75 (full criteria)
at San Francisco, California and other locations
study started
estimated completion
Principal Investigator
by Paul Larson
Photo of Paul Larson
Paul Larson



The objective of this Phase 1b investigation is to evaluate the safety and potential clinical effect of AAV2-GDNF delivered to the putamen in subjects with either a recent or a long-standing diagnosis of PD.

Official Title

Open-Label Safety Study of Glial Cell Line-Derived Neurotrophic Factor Gene Transfer (AAV2- GDNF) in Parkinson's Disease


Parkinson's Disease PD Neurotrophic factor Growth factor Glial cell line-derived neurotrophic factor GDNF AAV Gene therapy Parkinson Disease AAV2-GDNF


You can join if…

Open to people ages 35-75

  • Male and female adults 35-75 years of age (inclusive)
  • Diagnosed with Parkinson's disease
  • Modified Hoehn and Yahr stage I-III OFF medication
  • Time since receiving a clinical diagnosis of PD and disease severity consistent with one of the following:
  • EITHER: Less than 5 years since clinical diagnosis of PD and mild to moderate UPDRS III OFF score
  • OR: At least 4 years since clinical diagnosis of PD and moderate to severe UPDRS III OFF score
  • Responsiveness to levodopa

You CAN'T join if...

  • Atypical parkinsonism
  • Severe dyskinesia
  • Presence of dementia, psychosis, substance abuse or qualify as "severe depression"
  • Prior brain surgery (i.e. deep brain stimulator or DBS implantation) or other brain imaging abnormalities
  • Receiving an investigational drug
  • History of cancer or poorly controlled medical conditions that would increase surgical risk
  • Inability to tolerate laying flat in an MRI or allergy to gadolinium


  • University of California San Francisco accepting new patients
    San Francisco California 94103 United States
  • University of California Irvine accepting new patients
    Irvine California 92697 United States

Lead Scientist at UCSF

  • Paul Larson
    Dr. Paul Larson is Professor and Vice Chair of Neurological Surgery at the University of California San Francisco, Chief of Neurosurgery at the San Francisco VA Medical Center and Surgical Director of the Parkinson’s Disease Research, Education and Clinical Center. He specializes in functional neurosurgery, specifically deep brain stimulation for movement disorders and MR-guided procedures.


accepting new patients
Start Date
Completion Date
Brain Neurotherapy Bio, Inc.
Phase 1
Study Type
Last Updated