학술논문
Plasma pTau-217 and N-terminal tau (NTA) enhance sensitivity to identify tau PET positivity in amyloid-β positive individuals
Document Type
Author
Woo, M. S.; Tissot, C.; Lantero Rodriguez, Juan; Snellman, Anniina; Therriault, J.; Rahmouni, N.; Macedo, A. C.; Servaes, S.; Wang, Y. T.; Arias, J. F.; Hosseini, S. A.; Chamoun, M.; Lussier, F. Z.; Lessa Benedet, Andréa; Ashton, Nicholas J.; Karikari, T. K.; Triana-Baltzer, G.; Kolb, H. C.; Stevenson, J.; Mayer, C.; Kobayashi, E.; Massarweh, G.; Friese, M. A.; Pascoal, T. A.; Gauthier, S.; Zetterberg, Henrik, 1973; Blennow, Kaj, 1958; Rosa-Neto, P.
Source
Alzheimers & Dementia. 20(2):1166-1174
Subject
Language
English
ISSN
1552-5260
Abstract
INTRODUCTIONWe set out to identify tau PET-positive (A+T+) individuals among amyloid-beta (A beta) positive participants using plasma biomarkers.METHODSIn this cross-sectional study we assessed 234 participants across the AD continuum who were evaluated by amyloid PET with [18F]AZD4694 and tau-PET with [18F]MK6240 and measured plasma levels of total tau, pTau-181, pTau-217, pTau-231, and N-terminal tau (NTA-tau). We evaluated the performances of plasma biomarkers to predict tau positivity in A beta+ individuals.RESULTSHighest associations with tau positivity in A beta+ individuals were found for plasma pTau-217 (AUC [CI95%] = 0.89 [0.82, 0.96]) and NTA-tau (AUC [CI95%] = 0.88 [0.91, 0.95]). Combining pTau-217 and NTA-tau resulted in the strongest agreement (Cohen's Kappa = 0.74, CI95% = 0.57/0.90, sensitivity = 92%, specificity = 81%) with PET for classifying tau positivity.DISCUSSIONThe potential for identifying tau accumulation in later Braak stages will be useful for patient stratification and prognostication in treatment trials and in clinical practice.HighlightsWe found that in a cohort without pre-selection pTau-181, pTau-217, and NTA-tau showed the highest association with tau PET positivity.We found that in A beta+ individuals pTau-217 and NTA-tau showed the highest association with tau PET positivity.Combining pTau-217 and NTA-tau resulted in the strongest agreement with the tau PET-based classification.