CCL1 and Alzheimer disease: In the CC motif, data on the chemokines (CCL1, CCL15, and CCL27) from two or three cohorts of AD and controls yielded average ratios of 1.56 (95% CI, 1.02–2.39, p = 0.042, corrected p = 0.126; I2 = 92.3%), of 1.29 (95% CI, 1.13–1.47, corrected p = 0.009; I2 = 48.7%), and of 1.34 (95% CI, 1.19–1.51, p < 0.001; I2 = 0%), respectively.