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Background: Plasma phosphorylated tau217 (p-tau217) is a robust biomarker of Alzheimer's disease (AD) pathology. However, its full potential as a dynamic marker has still not been verified in very old persons, i.e., those with the highest incidence of AD. Objective: To examine the cross-sectional and longitudinal associations between plasma p-tau217 concentration and cerebrospinal fluid (CSF) AD b
