APOE and Alzheimer disease: Using data from a population‐based cohort of 2366 dementia‐free individuals, aged 60 years or older, from the Swedish National Study on Aging and Care in Kungsholmen (SNAC‐K), this study aimed to explore (1) the association of demographics, apolipoprotein E (APOE) genotype and chronic diseases, alone and in combination, with the concentrations of several blood biomarkers of AD; and (2) whether the associations between chronic diseases and AD blood biomarkers varied by systemic inflammatory status.