Key points from article :
Parkinson's drug administered via a port in the side of the head.
Glial cell line-derived neurotrophic factor could regenerate dying brain cells.
GDNF infused directly to the affected areas with pinpoint accuracy.
Brain scans showed average of 6 years of improvements.
Hope is that GDNF could even reverse the condition.
Placebo group also showed improved symptoms.
Port implant could also be used to administer chemotherapy and other drugs.
The findings from the trials are published in the medical journals Brain and the Journal of Parkinson's Disease.
