IL18 and Alzheimer disease: In Group 2 (AD patients over 10 years old) we found positive correlations of the median serum levels of the analyzed proteins for the following parameters: CXCL-11 and CXCL-9 (r = 0.85, P = .00001), CXCL-11 and CXCL-10 (r = 0.8, P = .00006), CXCL-11 and CCL-20 (r = 0.96, P < .001), CXCL-9 and CXCL-10 (r = 0.59, P = .01), CXCL-9 and CCL-20 (r = 0.84, P = .00002), CXCL-10 and CCL-20 (r = 0.79, P = .0002), and CCL-17 and IL-18 (r = 0.5, P = .03).