Abstract:
INTRODUCTION:As clinical trials move toward earlier intervention, we sought to redefine the β-amyloid (Aβ)-PET threshold based on the lowest point in a baseline distribution that robustly predicts future Aβ accumulation and cognitive decline in 3 independent samples of clinically normal individuals. METHODS:Sequential Aβ cutoffs were tested to identify the lowest cutoff associated with future change in cognition (Preclinical Alzheimer Cognitive Composite [PACC]) and Aβ-PET in clinically normal participants from the Harvard Aging Brain Study (n = 342), Australian Imaging, Biomarker and Lifestyle study of aging (n = 157), and Alzheimer's Disease Neuroimaging Initiative (n = 356). RESULTS:Within samples, cutoffs derived from future Aβ-PET accumulation and PACC decline converged on the same inflection point, beyond which trajectories diverged from normal. Across samples, optimal cutoffs fell within a short range (Centiloid 15-18.5). DISCUSSION:These optimized thresholds can help to inform future research and clinical trials targeting early Aβ. Threshold convergence raises the possibility of contemporaneous early changes in Aβ and cognition. CLASSIFICATION OF EVIDENCE:This study provides Class II evidence that among clinically normal individuals a specific Aβ-PET threshold is predictive of cognitive decline.
journal_name
Neurologyjournal_title
Neurologyauthors
Farrell ME,Jiang S,Schultz AP,Properzi MJ,Price JC,Becker JA,Jacobs HIL,Hanseeuw BJ,Rentz DM,Villemagne VL,Papp KV,Mormino EC,Betensky RA,Johnson KA,Sperling RA,Buckley RF,Alzheimer's Disease Neuroimaging Initiative and tdoi
10.1212/WNL.0000000000011214subject
Has Abstractpub_date
2021-01-26 00:00:00pages
e619-e631issue
4eissn
0028-3878issn
1526-632Xpii
WNL.0000000000011214journal_volume
96pub_type
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