Abnormal levels of proinflammatory cytokines, such as interleukins (IL), interferon-gamma (IFN-γ), monocyte chemoattractant protein-1 (MCP-1), and tumor necrosis factor-alpha (TNF-α), in CSF have been noted in various diseases of the nervous system, including AD [29]. This evidence concerns the gene IFNG and Alzheimer disease.