Robust Symptomatic Subtypes of Typical Alzheimer's Disease Characterized by Differential Neuropathological Patterns and Functional Decline
Bibliographic record
Abstract
Abstract Background Alzheimer’s disease (AD) is classically viewed as a predominantly amnestic syndrome, with other cognitive and neuropsychiatric symptoms (NPS) being non‐integral associations. Emerging Evidence suggests that within typical AD, these symptoms are core features from the onset. Methods We employed K‐modes clustering on 2483 cognitively impaired (CI) individuals (CDR >= 0.5), excluding participants diagnosed with atypical AD, non‐amnestic MCI, or CI due to non‐AD dementias from five cohorts: TRIAD, ADNI, BICWALZS, OASIS‐III, and Pittsburgh. Cluster‐specific clinical and pathological profiles were established through comparison with 2670 cognitively unimpaired (CU) participants across plasma biomarkers (Ptau‐181, Ptau‐217, GFAP, Nfl, AB42/40 ratio) and neuroimaging (amyloid and tau PET, white matter hyperintensity, MRI‐derived degeneration maps). The rate of functional decline, modeled by increase in CDR‐SB, was assessed using a Cox‐proportional hazards model and a linear mixed‐effect model. Results We identified five distinct clinical phenotypes within typical AD: 'Pure Amnestic' (30.2%), 'Linguistic‐Hyperactive' (14.7%), 'Visuospatial‐Affective' (14.7%), 'Frontal' (27.6%), and 'Global' (19.3%) (Figure 1, Figure 3). These phenotypes demonstrated consistency regardless of amyloid status or cohort. Each phenotype exhibited a unique neuropathological signature and a distinct pattern of neurodegeneration (Figure 2). A critical aspect of our findings is the differential rate of functional decline across these phenotypes. The 'Pure Amnestic' group showed the slowest decline, followed by 'Linguistic‐Hyperactive' (HR = 1.39; B = 0.2), 'Visuospatial‐Affective' (HR = 2.13; B = 1), 'Frontal' (HR = 2.23; B = 1.53), and the 'Global' phenotype showing the fastest decline (HR = 3.52; B = 2.66) (Figure 2, Figure 3). Conclusion Our results challenge the concept of “typical” AD by uncovering five robust clinical phenotypes with divergent neuropathological profiles and clinical characteristics. These results mark an important advancement toward personalized medicine in the landscape of emerging AD treatments.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".