APOE and Alzheimer disease: Within a German community-based cohort, two polygenic risk scores (clinical Alzheimer’s disease and Aβ42 based) were calculated, APOE genotype was determined, and Aβ misfolding in blood plasma was measured by immuno-infrared sensor in 59 participants diagnosed with Alzheimer’s disease during 14 years of follow-up and 581 participants without dementia diagnosis.