Alzheimer Disease
Open accessAbstract
Alzheimer disease (AD) was originally conceived as a rare disease that caused presenile dementia but has come to be understood as the most prevalent cause of dementia at any age worldwide. It has an extended preclinical phase characterized by sequential changes in imaging and cerebrospinal fluid biomarkers with subtle memory decline beginning more than a decade before the emergence of symptomatic memory loss heralding the beginning of the mild cognitive impairment stage. The apolipoprotein E ε4 allele is a prevalent and potent risk factor for AD that has facilitated research into its preclinical phase. Cerebral Aβ levels build from preclinical through early dementia stages followed by hyperphosphorylated tau-related pathology, the latter driving cognitive deficits and dementia severity. Structural and molecular imaging can now recapitulate the neuropathology of AD antemortem. Autosomal dominant forms of early-onset familial AD gave rise to the amyloid hypothesis of AD, which, in turn, has led to therapeutic trials of immunotherapy designed to clear cerebral amyloid, but to date results have been disappointing. Genome-wide association studies have identified multiple additional risk factors, but to date none have yielded an effective alternate therapeutic target. Current and future trials aimed at presymptomatic individuals either harboring cerebral amyloid or at genetically high risk offer the hope that earlier intervention might yet succeed where trials in patients with established dementia have failed. A major looming challenge will be that of expensive, incompletely effective disease-modifying therapy: who and when to treat, and how to pay for it.
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Clinical features lack specificity for a pathologic process, but rather indicate brain regions or systems affected by the disease process.
“clinical features lack specificity for a pathologic process, but rather indicate brain regions or systems affected by the disease process [3, 4].”
From The neuropathological diagnosis of Alzheimer's disease (2019) · cites this paper as [4]
The Clinical Background section says that variant Alzheimer syndromes reflect different pathological topography, with visual impairment linked to involvement of visual cortices. That supports the point that clinical features can indicate affected brain regions. The copy does not establish the broader claim that clinical features generally lack specificity for the underlying pathologic process. (LLM, conf=0.83)
Experimental — accuracy not yet measuredAlzheimer's pathology can be found in cognitively normal patients at autopsy, and this preclinical phase can also be observed in patients with mild cognitive impairment that do not meet criteria for clinical AD.
“Alzheimer’s pathology can be found in cognitively normal patients at the time of autopsy, and this preclinical phase can also be observed in patients with mild cognitive impairment that do not meet the criteria for clinical AD [4, 23].”
From The neuropathological diagnosis of Alzheimer's disease (2019) · cites this paper as [4]
Section VII, Possible Solutions, reports AD pathology at autopsy in people who appeared cognitively normal. Section II, Clinical Background, also reports AD pathology in patients diagnosed with MCI, but the paper distinguishes symptomatic MCI from the preclinical phase, when no symptoms are evident. It therefore does not support calling MCI part of that preclinical phase. Page numbers are not available in our copy. (LLM, conf=0.88)
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- Authors
- Caselli, R. J., Beach, T. G., Knopman, D. S., & Graff-Radford, N. R.
- Affiliations
- Mayo Clinic (US)
- Banner Sun Health Research Institute (US)
- Corresponding author
- Caselli, Richard J.
- Venue
- Mayo Clinic Proceedings
- Publisher
- Elsevier BV
- Published
- 2017-06
- Volume
- 92
- Issue
- 6
- Pages
- 978-994
- ISSN
- 0025-6196 (ISSN-L)
- PMC
- PMC5536337
- OpenAlex
- W2732154503
- Cited by
- 81
- References
- 158
- Citations by year
- 2026: 1 · 2025: 7 · 2024: 8 · 2023: 6 · 2022: 7 · 2021: 8 · 2020: 13 · 2019: 9 · 2018: 16 · 2017: 6
- FWCI
- 1.48
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Mayo Clinic Proceedings (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institute on Aging (R01AG044372, U01AG006786, R01AG031581, P30AG019610, R21AG044723, R01AG041851, P50AG016574)
- National Institute of Neurological Disorders and Stroke (R21NS093222, U24NS072026)
- Topics
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Keywords
- Alzheimer's disease, preclinical Alzheimer's disease, mild cognitive impairment, APOE ε4, amyloid-beta, tau hyperphosphorylation, cerebrospinal fluid biomarkers, anti-amyloid therapy, disease-modifying therapy, presymptomatic treatment, dementia risk factors, genome-wide association study
- MeSH terms
- Aging, Alzheimer Disease, Apolipoproteins E, Brain, Humans, Magnetic Resonance Imaging
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