(interleukin 1β) have a role in neuroinflammation, and functional polymorphisms in theTNF-
αandIL-1βgenes may affect susceptibility to Parkinson disease (PD). Objective To
investigate whether functional DNA polymorphisms of theTNF-αandIL-1βgenes affect the
risk of PD. Design Population-based case-control study. Setting Three rural California
counties (Fresno, Tulare, and Kern). Participants Two hundred eighty-nine incident …