One-Stop Shop: 18 F-Flortaucipir PET Differentiates Amyloid-Positive and -Negative Forms of Neurodegenerative Diseases

Medientyp: E-Artikel

Titel: One-Stop Shop: 18 F-Flortaucipir PET Differentiates Amyloid-Positive and -Negative Forms of Neurodegenerative Diseases

Beteiligte: Hammes, Jochen [VerfasserIn]; Bischof, Gérard N. [VerfasserIn]; van Eimeren, Thilo [VerfasserIn]; Bohn, Karl P. [VerfasserIn]; Onur, Özgür [VerfasserIn]; Schneider, Anja [VerfasserIn]; Fliessbach, Klaus [VerfasserIn]; Hönig, Merle C [VerfasserIn]; Jessen, Frank [VerfasserIn]; Neumaier, Bernd [VerfasserIn]; Drzezga, Alexander [VerfasserIn]

Erschienen: Soc., 2021

Sprache: Englisch

DOI: https://doi.org/10.2967/jnumed.120.244061

ISSN: 0022-3123; 1535-5667; 0097-9058; 0161-5505; 2159-662X

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Beschreibung: Tau protein aggregations are a hallmark of amyloid-associated Alzheimer disease and some forms of non–amyloid-associated frontotemporal lobar degeneration. In recent years, several tracers for in vivo tau imaging have been under evaluation. This study investigated the ability of 18F-flortaucipir PET not only to assess tau positivity but also to differentiate between amyloid-positive and -negative forms of neurodegeneration on the basis of different 18F-flortaucipir PET signatures. Methods: The 18F-flortaucipir PET data of 35 patients with amyloid-positive neurodegeneration, 19 patients with amyloid-negative neurodegeneration, and 17 healthy controls were included in a data-driven scaled subprofile model (SSM)/principal-component analysis (PCA) identifying spatial covariance patterns. SSM/PCA pattern expression strengths were tested for their ability to predict amyloid status in a receiver-operating-characteristic analysis and validated with a leave-one-out approach. Results: Pattern expression strengths predicted amyloid status with a sensitivity of 0.94 and a specificity of 0.83. A support vector machine classification based on pattern expression strengths in 2 different SSM/PCA components yielded a prediction accuracy of 98%. Anatomically, prediction performance was driven by parietooccipital gray matter in amyloid-positive patients versus predominant white matter binding in amyloid-negative patients. Conclusion: SSM/PCA-derived binding patterns of 18F-flortaucipir differentiate between amyloid-positive and -negative neurodegenerative diseases with high accuracy. 18F-flortaucipir PET alone may convey additional information equivalent to that from amyloid PET. Together with a perfusion-weighted early-phase acquisition (18F-FDG PET–equivalent), a single scan potentially contains comprehensive information on amyloid (A), tau (T), and neurodegeneration (N) status as required by recent biomarker classification algorithms (A/T/N).

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