CCL5 and Alzheimer disease: Our results showed that the A allele of CCL5 − 403G/A in the allelic model, the AG genotype of CCL5 − 403G/A in the heterozygous model, the AA + AG genotype of CCL5 − 403G/A in the dominant model, the G allele of CCL5 − 28C/G in the allelic model and the GG + GC genotype of CCL5 − 28C/G in the dominant model were significantly associated with an increased risk of AD.