HDAC9 and Alzheimer disease: Moreover, we observed that the G allele of HDAC9 SNP rs79524815 is associated with a higher level of the joint outcome of NFT and CAA, and proxy SNPs for rs79524815 (which are suggestively associated with the joint outcome of NFT and CAA) are associated with decreased HDAC9 expression in subjects with AD (Additional file 1: Table S3).