Serum urate as a predictor of clinical and radiographic progression in Parkinson disease.

Archives of Neurology
Michael A SchwarzschildJohn Ondrasik

Abstract

To determine whether concentration of serum urate, a purine metabolite and potent antioxidant that has been linked to a reduced risk of Parkinson disease (PD), predicts prognosis in PD. Prospective study. The Parkinson Research Examination of CEP-1347 Trial (PRECEPT) study, which investigated the effects of a potential neuroprotectant on rates of PD progression, was conducted between April 2002 and August 2005 (average follow-up time 21.4 months). Eight hundred four subjects with early PD enrolled in the PRECEPT study. The primary study end point was progression to clinical disability sufficient to warrant dopaminergic therapy. Cox proportional hazards models were used to estimate the hazard ratio (HR) of reaching end point according to quintiles of baseline serum urate concentration, adjusting for sex, age, and other potential covariates. Change in striatal uptake of iodine I 123-labeled 2-beta-carbomethoxy-3-beta-(4-iodophenyl)tropane ([(123)I]beta-CIT), a marker for the presynaptic dopamine transporter, was assessed with linear regression for a subset of 399 subjects. The adjusted HR of reaching end point declined with increasing baseline concentrations of urate; subjects in the top quintile reached the end point at only hal...Continue Reading

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