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Prevalence of preclinical Alzheimer disease Comparison of current classification systems

Journal article
Authors Silke Kern
Henrik Zetterberg
Jürgen Kern
Anna Zettergren
Margda Waern
Kina Höglund
Ulf Andreasson
Hanna Wetterberg
Anne Börjesson-Hanson
Kaj Blennow
Ingmar Skoog
Published in Neurology
Volume 90
Issue 19
Pages E1682-E1691
ISSN 0028-3878
Publication year 2018
Published at Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry
Pages E1682-E1691
Language en
Links dx.doi.org/10.1212/wnl.000000000000...
Keywords cerebrospinal-fluid, diagnostic-criteria, cognitive impairment, biomarker changes, dementia, beta, age, population, memory, metaanalysis, Neurosciences & Neurology
Subject categories Neurology

Abstract

Objective To determine the prevalence of preclinical Alzheimer disease (AD) according to current classification systems by examining CSF from a representative general population sample of 70-year-olds from Gothenburg, Sweden. The sample was derived from the population-based H70 Gothenburg Birth Cohort Studies in Gothenburg, Sweden. The participants (n = 322, age 70 years) underwent comprehensive neuropsychiatric, cognitive, and somatic examinations. CSF levels of beta-amyloid (A beta)(42), A beta(40), total tau, and phosphorylated tau were measured. Preclinical AD was classified according to criteria of the A/T/N system, Dubois 2016, National Institute on Aging-Alzheimer's Association (NIA-AA) criteria, and International Working Group-2 (IWG-2) criteria. Individuals with Clinical Dementia Rating score > 0 were excluded, leaving 259 cognitively unimpaired individuals. The prevalence of amyloid pathology was 22.8%, of total tau pathology was 33.2%, and of phosphorylated tau pathology was 6.9%. With the A/T/N system, the prevalence of A+/T-/N- was 13.1%, A+/T-/N+ was 7.3%, A+/T+/N+ was 2.3%, A-/T-/N+ was 18.9%, and A-/T+/N+ was 4.6%. When the Dubois criteria were applied, the prevalence of asymptomatic at risk for AD was 36.7% and of preclinical AD was 9.7%. With the NIA-AA criteria, the prevalence of stage 1 was 13.1% and stage 2 was 9.7%. With the IWG-2 criteria, the prevalence of asymptomatic at risk for AD was 9.7%. The APOE epsilon 4 allele was associated with several of the categories. Men more often had total tau pathology, A+/T-/N+, preclinical AD according to Dubois 2016, asymptomatic at risk for AD according to the IWG-2 criteria, and NIA-AA stage 2. The prevalence of pathologic AD markers was very common (46%) in a representative population sample of 70-year-olds. The clinical implications of these findings need to be scrutinized further in longitudinal studies.

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