IL6 and Alzheimer disease: Concentration of various proinflammatory cytokines including IL-1β, IL-6, IL-12, IL-18, and TNFα and anti-inflammatory cytokines such as interleukin-1 receptor antagonist (IL-1RA) and IL-10 have been found to increase in cerebrospinal fluid (CSF) of AD patients, pointing to an immune disturbance [19–22].