We measured levels of IL-1β, IL-2, IL-6, IL-18, TNF-α, β-Amlyloid 1–40 and α1-antichymotrypsin levels in plasma in groups of total 82 subjects with AD, MCI, VD and controls using enzyme-linked immunosorbent assay (ELISA) method. Here, IL2 is linked to Alzheimer disease.