http://clinicaltrials.gov/ct2/show/NCT00833690
According to the clinical trials website the inosine study must have been completed. The estimated completion date was december 2012. Studies have shown that people with higher urate level progress 40 % slower in PD than people with lower urate levels. This trial intends to show whether intake of inosine increases urate levels in brain fluid enough to slow down the progression of the disease. Results of the trial should be available soon.