Data-driven FDG-PET subtypes of Alzheimer’s disease-related neurodegeneration
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Abstract
Background: Previous research has described distinct subtypes of Alzheimer’s disease (AD) based on the differences in regional patterns of brain atrophy on MRI. We conducted a data-driven exploration of distinct AD neurodegeneration subtypes using FDG-PET as a sensitive molecular imaging marker of neurodegenerative processes. Methods: Hierarchical clustering of voxel-wise FDG-PET data from 177 amyloid-positive patients with AD dementia enrolled in the Alzheimer’s Disease Neuroimaging Initiative (ADNI) was used to identify distinct hypometabolic subtypes of AD, which were then further characterized with respect to clinical and biomarker characteristics. We then classified FDG-PET scans of 217 amyloid-positive patients with mild cognitive impairment (“prodromal AD”) according to the identified subtypes and studied their domain-specific cognitive trajectories and progression to dementia over a follow-up interval of up to 72 months. Results: Three main hypometabolic subtypes were identified: (i) “typical” (48.6%), showing a classic posterior temporo-parietal hypometabolic pattern; (ii) “limbic-predominant” (44.6%), characterized by old age and a memory-predominant cognitive profile; and (iii) a relatively rare “cortical-predominant” subtype (6.8%) characterized by younger age and more severe executive dysfunction. Subtypes classified in the prodromal AD sample demonstrated similar subtype characteristics as in the AD dementia sample and further showed differential courses of cognitive decline. Conclusions: These findings complement recent research efforts on MRI-based identification of distinct AD atrophy subtypes and may provide a potentially more sensitive molecular imaging tool for early detection and characterization of AD-related neurodegeneration variants at prodromal disease stages.
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Levin et al. used FDG-PET in the ADNI dataset to subtype AD into typical, limbic-predominant, and cortical-predominant types that correlate with brain atrophy subtypes and clinical trajectories.
“Levin et al. used FDG-PET in the ADNI dataset to subtype AD in ‘typical’, ‘limbic-predominant’ and ‘cortical-predominant’ types that correlate with the brain atrophy subtypes and the different clinical trajectories [117].”
From The use of neuroimaging techniques in the early and differential diagnosis of dementia (2023) · cites this paper as [117]
The Abstract Methods and Results describe FDG-PET subtyping in ADNI into the three named groups and report different cognitive trajectories in the prodromal AD sample. The Discussion (‘Distinct hypometabolic subtypes’) says the limbic-predominant pattern resembles an MRI-defined atrophy subtype but also differs from it; it does not establish a correlation between all three FDG-PET subtypes and brain-atrophy subtypes. (LLM, conf=0.83)
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- Authors
- Levin, F., Ferreira, D., Lange, C., Dyrba, M., Westman, E., Buchert, R., Teipel, S. J., Grothe, M. J., & Initiative, F. T. A. D. N.
- Affiliations
- German Center for Neurodegenerative Diseases (DE)
- Karolinska Institutet (SE)
- Humboldt-Universität zu Berlin (DE)
- King's College London (GB)
- University Medical Center Hamburg-Eppendorf (DE)
- Consejo Superior de Investigaciones Científicas (ES)
- Corresponding author
- Grothe, Michel J.
- ORCID
- Venue
- Alzheimer's Research & Therapy
- Published
- 2021-02-19
- Volume
- 13
- Issue
- 1
- Pages
- 49-49
- ISSN
- 1758-9193 (ISSN-L)
- PMC
- PMC7896407
- OpenAlex
- W3129955977
- Cited by
- 109
- References
- 5
- Citations by year
- 2026: 13 · 2025: 26 · 2024: 26 · 2023: 22 · 2022: 13 · 2021: 9
- FWCI
- 12.56
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Alzheimer s Research & Therapy (publishedVersion, cc-by)
- Research Square (acceptedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- RISalud Institutional Health Repository of Andalucía (submittedVersion, cc-by)
- Informationszentrum Lebenswissenschaften (ZB MED) (submittedVersion, cc-by)
- DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- DZNE Pub (submittedVersion, cc-by)
- Funders
- Instituto de Salud Carlos III (CP19/00031)
- Foundation for the National Institutes of Health (U01 AG024904)
- U.S. Department of Defense (W81XWH-12-2-0012)
- Topics
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Medical Imaging Techniques and Applications
- Keywords
- Alzheimer's disease, FDG-PET hypometabolism, mild cognitive impairment, prodromal Alzheimer's disease, cognitive decline trajectories, executive dysfunction, molecular imaging biomarkers
- MeSH terms
- Alzheimer Disease, Brain, Humans, Magnetic Resonance Imaging, Fluorodeoxyglucose F18, Positron-Emission Tomography, Cognitive Dysfunction
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