The concentrations of the other chemokines (CCL2, CCL3, CCL4, CCL5, CCL7, CCL11, CCL15, and CXCL8) in plasma or serum did not change substantially between AD and MCI (average ratios ranging from 0.98 to 1.13, all p > 0.05). Here, CCL5 is linked to Alzheimer disease.