A series of studies conducted by Kakinuma et al. demonstrated that the mean serum CCL17/TARC levels (normal value: <450 pg/mL) of AD, BP, and MF patients were 2338.70 ± 302.83, 1151.5 ± 885.6, and 2889.6 ± 725.5 pg/mL, respectively [39,40,41]. Here, CCL17 is linked to Alzheimer disease.