Prevalence and prognosis of Alzheimer's disease at the mild cognitive impairment stage

Item Type:	Article
Title:	Prevalence and prognosis of Alzheimer's disease at the mild cognitive impairment stage
Creators Name:	Vos, S.J.B. and Verhey, F. and Froelich, L. and Kornhuber, J. and Wiltfang, J. and Maier, W. and Peters, O. and Ruether, E. and Nobili, F. and Morbelli, S. and Frisoni, G.B. and Drzezga, A. and Didic, M. and van Berckel, B.N.M. and Simmons, A. and Soininen, H. and Kloszewska, I. and Mecocci, P. and Tsolaki, M. and Vellas, B. and Lovestone, S. and Muscio, C. and Herukka, S.K. and Salmon, E. and Bastin, C. and Wallin, A. and Nordlund, A. and de Mendonca, A. and Silva, D. and Santana, I. and Lemos, R. and Engelborghs, S. and Van der Mussele, S. and Freund-Levi, Y. and Wallin, A.K. and Hampel, H. and van der Flier, W. and Scheltens, P. and Visser, P.J.
Abstract:	Three sets of research criteria are available for diagnosis of Alzheimer's disease in subjects with mild cognitive impairment: the International Working Group-1, International Working Group-2, and National Institute of Aging-Alzheimer Association criteria. We compared the prevalence and prognosis of Alzheimer's disease at the mild cognitive impairment stage according to these criteria. Subjects with mild cognitive impairment (n = 1607), 766 of whom had both amyloid and neuronal injury markers, were recruited from 13 cohorts. We used cognitive test performance and available biomarkers to classify subjects as prodromal Alzheimer's disease according to International Working Group-1 and International Working Group-2 criteria and in the high Alzheimer's disease likelihood group, conflicting biomarker groups (isolated amyloid pathology or suspected non-Alzheimer pathophysiology), and low Alzheimer's disease likelihood group according to the National Institute of Ageing-Alzheimer Association criteria. Outcome measures were the proportion of subjects with Alzheimer's disease at the mild cognitive impairment stage and progression to Alzheimer's disease-type dementia. We performed survival analyses using Cox proportional hazards models. According to the International Working Group-1 criteria, 850 (53%) subjects had prodromal Alzheimer's disease. Their 3-year progression rate to Alzheimer's disease-type dementia was 50% compared to 21% for subjects without prodromal Alzheimer's disease. According to the International Working Group-2 criteria, 308 (40%) subjects had prodromal Alzheimer's disease. Their 3-year progression rate to Alzheimer's disease-type dementia was 61% compared to 22% for subjects without prodromal Alzheimer's disease. According to the National Institute of Ageing-Alzheimer Association criteria, 353 (46%) subjects were in the high Alzheimer's disease likelihood group, 49 (6%) in the isolated amyloid pathology group, 220 (29%) in the suspected non-Alzheimer pathophysiology group, and 144 (19%) in the low Alzheimer's disease likelihood group. The 3-year progression rate to Alzheimer's disease-type dementia was 59% in the high Alzheimer's disease likelihood group, 22% in the isolated amyloid pathology group, 24% in the suspected non-Alzheimer pathophysiology group, and 5% in the low Alzheimer's disease likelihood group. Our findings support the use of the proposed research criteria to identify Alzheimer's disease at the mild cognitive impairment stage. In clinical settings, the use of both amyloid and neuronal injury markers as proposed by the National Institute of Ageing-Alzheimer Association criteria offers the most accurate prognosis. For clinical trials, selection of subjects in the National Institute of Ageing-Alzheimer Association high Alzheimer's disease likelihood group or the International Working Group-2 prodromal Alzheimer's disease group could be considered.
Keywords:	Alzheimer’s Disease, MCI, Biomarkers, Diagnostic Criteria, Prognosis
Source:	Brain
ISSN:	0006-8950
Publisher:	Oxford University Press
Volume:	138
Number:	Pt 5
Page Range:	1327-1338
Date:	May 2015
Official Publication:	https://doi.org/10.1093/brain/awv029
PubMed:	View item in PubMed

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