IL6 and Parkinson disease: Researchers found that proinflammatory factors such as interleukin-1β (IL-1β), interleukin-2 (IL-2), interleukin-6 (IL-6), interleukin-10 (IL-10), and tumor necrosis factor-α (TNF-α) can be used as important inflammatory biomarkers to detect PD from the serum and cerebrospinal fluid (CSF) of patients with PD (Liu et al., 2022).