HLA-DPA1 and Alzheimer disease: DPA1*01:03 (0.60 (0.49, 0.73); p = 5.92 × 10−07) was associated with a decreased risk of AD and DPA1*02:01 (1.49 (1.17, 1.91); p = 0.0013), and DPA1*02:02 (1.78 (1.22, 2.59); p = 0.0028)) were significantly associated with an increased risk of AD.