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Alzheimer's Research & Therapy
Published in: Alzheimer's Research & Therapy 1/2019

Open Access 01-12-2019 | Alzheimer's Disease | Research

Prevalence and risk of progression of preclinical Alzheimer’s disease stages: a systematic review and meta-analysis

Authors: Lucilla Parnetti, Elena Chipi, Nicola Salvadori, Katia D’Andrea, Paolo Eusebi

Published in: Alzheimer's Research & Therapy | Issue 1/2019

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Abstract

Background

Alzheimer’s disease (AD) pathology begins several years before the clinical onset. The long preclinical phase is composed of three stages according to the 2011National Institute on Aging and Alzheimer’s Association (NIA-AA) criteria, followed by mild cognitive impairment (MCI), a featured clinical entity defined as “due to AD”, or “prodromal AD”, when pathophysiological biomarkers (i.e., cerebrospinal fluid or positron emission tomography with amyloid tracer) are positive. In the clinical setting, there is a clear need to detect the earliest symptoms not yet fulfilling MCI criteria, in order to proceed to biomarker assessment for diagnostic definition, thus offering treatment with disease-modifying drugs to patients as early as possible. According to the available evidence, we thus estimated the prevalence and risk of progression at each preclinical AD stage, with special interest in Stage 3.

Methods

Cross-sectional and longitudinal studies published from April 2008 to May 2018 were obtained through MEDLINE-PubMed, screened, and systematically reviewed by four independent reviewers. Data from included studies were meta-analyzed using random-effects models. Heterogeneity was assessed by I2 statistics.

Results

Estimated overall prevalence of preclinical AD was 22% (95% CI = 18–26%). Rate of biomarker positivity overlapped in cognitively normal individuals and people with subjective cognitive decline. The risk of progression increases across preclinical AD stages, with individuals classified as NIA-AA Stage 3 showing the highest risk (73%, 95% CI = 40–92%) compared to those in Stage 2 (38%, 95% CI = 21–59%) and Stage 1 (20%, 95% CI = 10–34%).

Conclusion

Available data consistently show that risk of progression increases across the preclinical AD stages, where Stage 3 shows a risk of progression comparable to MCI due to AD. Accordingly, an effort should be made to also operationalize the diagnostic work-up in subjects with subtle cognitive deficits not yet fulfilling MCI criteria. The possibility to define, in the clinical routine, a patient as “pre-MCI due to AD” could offer these subjects the opportunity to use disease-modifying drugs at best.
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Metadata
Title
Prevalence and risk of progression of preclinical Alzheimer’s disease stages: a systematic review and meta-analysis
Authors
Lucilla Parnetti
Elena Chipi
Nicola Salvadori
Katia D’Andrea
Paolo Eusebi
Publication date
01-12-2019
Publisher
BioMed Central
Published in
Alzheimer's Research & Therapy / Issue 1/2019
Electronic ISSN: 1758-9193
DOI
https://doi.org/10.1186/s13195-018-0459-7

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