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J Alzheimers Dis. 2017;57(2):447-459. doi: 10.3233/JAD-161223.

Cognitive Composites Domain Scores Related to Neuroimaging Biomarkers within Probable-Amnestic Mild Cognitive Impairment-Storage Subtype.

Author information

1
Research Center and Memory Clinic, Fundació ACE, Institut Català de Neurociències Aplicades, Alzheimer Barcelona, Spain.
2
Araclon Biotech S.L., Zaragoza, Spain.
3
Deparment of Psychiatry, Hospital Universitari Vall d'Hebron, CIBERSAM, Universitat Autònoma de Barcelona, Barcelona, Spain.
4
Clínica Corachán, Barcelona, Spain.
5
Department of Neurology, Hospital Universitari Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain.
6
Fundación CITA, Centro de Investigación y Terapias Avanzadas, Alzheimer, San Sebastián, Spain.
7
Hospital Universitari Germans Trias i Pujol, Unitat RM Badalona, Institut de diagnòstic per la imatge, Badalona, Spain.
8
Clínica Universitaria de Pamplona, Pamplona, Spain.
9
Pentara Corporation, Salt Lake City, UT, USA.
10
Alzheimer's Disease Research Center, University of Pittsburgh, Pittsburgh, PA, USA.
11
Helen Wills Neuroscience Institute, University of California, Berkeley, CA, USA.

Abstract

The probable-amnestic (Pr-a) mild cognitive impairment (MCI)-storage subtype is a phenotype with 8.5 times more risk of conversion to dementia, mainly Alzheimer's disease (AD), than the possible non-amnestic (Pss-na) MCI. The aim of this study was to find the optimized cognitive composites (CCs) domain scores most related to neuroimaging biomarkers within Pr-aMCI-storage subtype patients. The Fundació ACE (ACE) study with 20 Pr-aMCI-storage subtype subjects (MCI) were analyzed. All subjects underwent a neuropsychological assessment, a structural MRI, FDG-PET, and PIB-PET. The adjusted hippocampal volume (aHV) on MRI, the standard uptake value ratio (SUVR) on FDG-PET and PIB-PET SUVR measures were analyzed. The construction of the CCs domain scores, and the aHV on MRI and FDG-PET SUVR measures, were replicated in the parental AB255 study database (n = 133 MCI). Partial correlations adjusted by age, gender, and education were calculated with the associated p-value among every CC domain score and the neuroimaging biomarkers. The results were replicated in the "MCI due to AD" with memory storage impairments from ADNI. Delayed Recall CC domain score was significantly correlated with PIB-PET SUVR (β= -0.61, p = 0.003) in the ACE study and also with aHV on MRI (β= 0.27, p = 0.01) and FDG-PET SUVR (β= 0.27, p = 0.01) in the AB255 study. After a median survival time of 20.6 months, 85% from the ACE MCI converted to AD. The replication of our results in the ADNI dataset also confirmed our findings. Delayed Recall is the CC domain score best correlated with neuroimaging biomarkers associated with prodromal AD diagnosis.

KEYWORDS:

Alzheimer’s disease; amnestic mild cognitive impairment; amyloid; cognition; hippocampus; magnetic resonance imaging; memory; positron emission tomography

PMID:
28269787
PMCID:
PMC5366247
DOI:
10.3233/JAD-161223
[Indexed for MEDLINE]
Free PMC Article

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