TNF and amyotrophic lateral sclerosis: Meta‐analysis of inflammatory cytokines within cerebrospinal fluid (CSF) in patients with ALS, AD, and PD demonstrated the significant, disease specific variance in specific proteins, such as tumor growth factor‐β (TGFβ), tumor necrosis factor‐α (TNFα) and interleukin (IL)‐6, as compared to control subjects [8].