Related Experiment Video
Updated: Aug 6, 2026
Hybrid PET/MRI Imaging of Alzheimer's Disease Based on 18F-AV-1451
Published on: April 18, 2025
Prognostic value of plasma %p-tau217 in cognitively unimpaired older adults
Jesús Silva-Rodríguez1,2, Linda Zhang1, Luca Kleineidam3,4
1Reina Sofía Foundation Alzheimer Centre, CIEN Foundation, ISCIII, Madrid, Spain.
Introduction:
We evaluated the prognostic value of baseline plasma phosphorylated tau 217 ratio (%p-tau217) for predicting long-term progression in cognitively unimpaired (CU) older adults.
Methods:
We analyzed 982 community-dwelling individuals followed annually for up to 12 years. Baseline %p-tau217 levels were quantified by mass spectrometry and stratified into four strata using previously defined cut-offs. Outcomes included longitudinal changes in cognition, neurodegeneration, and progression to mild cognitive impairment (MCI)/dementia. Results were replicated with immunoassays in the same and an independent primary care cohort (n = 1204).
Results:
Participants with Elevated/High %p-tau217 exhibited accelerated cognitive decline, hippocampal atrophy, and significantly higher risks of progression to MCI (hazard ratio [HR] > 6.0) and dementia (HR > 9.9). The Low group demonstrated a 92.2% 10-year negative predictive value for any progression.
Discussion:
Our results suggest that %p-tau217 is a robust prognostic biomarker, accurately distinguishing CU individuals at minimal risk from those at high risk of future AD-related clinical and neurodegenerative decline. Similar performance was achieved by immunoassays.
