Inflammation-related genes and the risk of Parkinson's disease: a multilocus approach.

For the first time, the multilocus approach by the set-association method has been applied for the analysis of a cluster of five genes [tumor necrosis factor alpha (TNF-alpha), interleukin 6 (IL-6), IL-8, IL-1alpha and IL-10] involved in the brain neuroinflammatory pathway in Parkinson's disease (PD), in a well-defined group of 197 PD patients and 173 control subjects from Spain. Set-association analysis did not reveal an independent or an interactive effect of these inflammatory genes on the PD risk.