GWASs of AD plasma biomarkers have identified APOE, beta‐secretase 1 (BACE1), presenilin 2 (PSEN2), and amyloid beta precursor protein (APP) for plasma Aβ 8 and microtubule associated protein tau (MAPT) gene for plasma total tau.9 The gene discussed is APOE; the disease is Alzheimer disease.