In addition, the 5.6 Kb deletion, covering exons 2–5 of HLA-DRA found in nine AD cases by Swaminathan et al.43, are present in eight samples in our analysis, including five AD cases (three showed early onset of AD with age < 65) and three unclear-AD-status individuals (two are diagnosed as progressive supranuclear palsy, and the remaining one is with BRAAK stage 2). Here, HLA-DRA is linked to Alzheimer disease.