CCL2 and Alzheimer disease: In a two-year follow-up study in Taiwan, including AD (N = 310; Mean age: 80.1 ± 7.2 years), MCI (N = 66; Mean age: 75.4 ± 8.2 years), and the HC (N = 120; Mean age: 74.9 ± 7.8 years), a significant correlation between baseline CCL2 and mini-mental state examination (MMSE) score was observed.