TNF and Parkinson disease: Recently, a case‐control study (72 Parkinson's disease patients, 56 HC) was reported with investigation of selected serum immune mediator such as cytokines (IFN‐γ, TNFα, and IL‐10) and nitric oxide (NOx) in Parkinson's disease progression.[34] TNF‐α‐mediated neurotoxicity appears to occur in early Parkinson's disease (PD), but both IFN‐γ and IL‐10 are involved in disease severity.