Newsday.com: Parkinson's drug gains evidence

"Five years ago, the first patients to receive GDNF were enrolled in a study at the Frenchay Hospital in Bristol, England. In December, a 62-year-old patient in the study died of a heart attack, which provided an opportunity to see whether the medicine had done its job in the brain. In life, the patient had noted dramatic improvements, the British scientists said. A brain autopsy showed the experimental treatment 'caused regrowth of the nerve fibers lost in the disease.' The study was conducted by Frenchay's Dr. Steven Gill and Seth Love of Bristol University."