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UCLA researchers published their results in February issue of the Bentham Open Stem Cell Journal which outlines the long term results of the trial.

"We have documented the first successful adult neural stem cell transplantation to reverse the effects of Parkinson's disease and demonstrated the long term safety and therapeutic effects of this approach," says lead author Dr. Michel Levesque.

The paper describes how Levesque's team was able to isolate patient-derived neural stem cells, multiply them in vitro and ultimately differentiate them to produce mature neurons before they are reintroduced into the brain.

The team was able to inject the adult stem cells without the need for immunosuppressants. Unlike embryonic stem cells, adult stem cell injections don't cause a patient's immune system to reject the cells.

The adult stem cells were highly beneficial for the patient involved in the study.

"Of particular note are the striking results this study yielded -- for the five years following the procedure the patient's motor scales improved by over 80% for at least 36 months," Levesque wrote.

He said he hoped a larger clinical trial would replicate the findings.