Arousal affects cognition, emotion, and behavior and has been implicated in the etiology of psychiatric disorders. 5 key findings →
Participants: 1,877 Evidence: moderate
Full summary, score breakdown and related studies → Original source
27,380 Alzheimer's and dementia studies in plain English, each scored out of 100.
Arousal affects cognition, emotion, and behavior and has been implicated in the etiology of psychiatric disorders. 5 key findings →
Participants: 1,877 Evidence: moderate
Full summary, score breakdown and related studies → Original source
Subjective cognitive decline (SCD) is widely regarded as a potential preclinical stage of Alzheimer's disease (AD), yet its genetic basis remains poorly understood. 5 key findings →
Participants: 9,284 Evidence: moderate
Full summary, score breakdown and related studies → Original source
We identified associations in EAs with variants in 12 novel loci. 3 key findings →
Design: case-control study Evidence: moderate
Full summary, score breakdown and related studies → Original source
In order to assess the frequency of mutations in the known Alzheimer's disease causative genes in Turkish dementia patients we screened amyloid precursor protein (APP), PSEN1 and PSEN2 for mutations in a cohort of 98 Turkish dementia families. 1 key finding →
Design: cohort study Evidence: moderate
Full summary, score breakdown and related studies → Original source
Around 40% of dementia risk is attributable to modifiable risk factors such as physical inactivity, hypertension, diabetes and obesity. 5 key findings →
Design: cohort study Evidence: moderate
Full summary, score breakdown and related studies → Original source
Beta-amyloid deposition is a defining feature of Alzheimer's disease (AD). 4 key findings →
Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
Previously derived polygenic risk scores (PRSs) for Alzheimer's disease (AD) perform inconsistently across diverse ancestries. 3 key findings →
Design: cohort Evidence: high
Full summary, score breakdown and related studies → Original source Free full text
The APOE locus is the strongest genetic factor for Alzheimer's disease, with ε4 increasing and ε2 decreasing risk, yet the basis of these opposing effects remains unclear. 1 key finding →
Design: cohort Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
The extent to which the pathophysiology of autosomal dominant Alzheimer's disease corresponds to the pathophysiology of 'sporadic' late onset Alzheimer's disease is unknown, thus limiting the extrapolation of study findings and clinical trial results in autosomal dominant Alzheimer's disease to late onset Alzheimer's disease. 3 key findings →
Participants: 559 Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
Apolipoprotein E (Apo-E) is a major cholesterol carrier that supports lipid transport and injury repair in the brain. 3 key findings →
Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
Apolipoprotein E (APOE) dependent lifetime risks (LTRs) for Alzheimer Disease (AD) are currently not accurately known and odds ratios alone are insufficient to assess these risks. 1 key finding →
Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
The combined measure of CSF Abeta42 and tau meets the requirements for clinical use in discriminating AD from normal aging and specific neurologic disorders. 4 key findings →
Participants: 84 Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
Alpha-2-macroglobulin (alpha-2M; encoded by the gene A2M) is a serum pan-protease inhibitor that has been implicated in Alzheimer disease (AD) based on its ability to mediate the clearance and degradation of A beta, the major component of beta-amyloid deposits. 3 key findings →
Evidence: low
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Cerebrospinal fluid tau and CSF-Abeta42 have so far been studied in research settings, under conditions providing data on the optimal performance. 1 key finding →
Participants: 105 Evidence: low
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PIB-positive subjects with mild cognitive impairment (MCI) are significantly more likely to convert to AD than PIB-negative patients, faster converters having higher PIB retention levels at baseline than slower converters. 4 key findings →
Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
Identifying individuals at risk for developing Alzheimer disease (AD) is of utmost importance. 5 key findings →
Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
The amyloid β subgroups did not differ for any psychobehavioural, cognitive, actigraphy, and structural and functional neuroimaging results after adjustment for age, sex, and level of education More participants positive for amyloid β deposition had the APOE ε4 allele (33 [38%] vs 29 [13%], p 1-42 concentration in CSF significantly correlated with mean 18 F-florbetapir uptake at baseline (r=-0·62, p 1-42 to amyloid β 1-40 (r=-0·61, p 18 F-florbetapir uptake at baseline (mean standard uptake value ratio 1·46 [SD 0·16] vs 1·02 [SD 0·20]), and more were carriers of the APOE ε4 allele (three [75%] of four vs 33 [39%] of 83). 1 key finding →
Participants: 318 Evidence: low
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This risk score could be used to identify persons at risk of LOAD, but can also be used to adjust for confounders in epidemiologic studies. 2 key findings →
Design: longitudinal study Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
Our findings suggest that inflammation in the CNS increases in normal aging and is intimately related to markers of neurodegeneration in the preclinical stages of AD and SNAP. sAPPβ and β-secretase activity are not useful diagnostic or staging markers in preclinical AD. 2 key findings →
Design: cross-sectional Evidence: moderate
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Microbleed presence was associated with lower CSF Aβ42 in AD and vascular dementia (standardized beta = -0.09, P = .003; standardized beta = -0.30, P = .01), and higher CSF tau in controls (standardized beta = 0.10, P = .03). 4 key findings →
Design: cross-sectional Participants: 914 Evidence: moderate
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It was one of the genes most strongly associated with risk of Alzheimer's disease in a Belgian cohort. 5 key findings →
Participants: 183 Evidence: moderate
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The proportion of progressors was 11% (8/41), 34% (14/41), 56% (19/34), and 71% (60/85) in A-N-, A+N-, SNAP, and A+N+, respectively; the proportion of APOE ε4 carriers was 29%, 70%, 31%, and 71%, respectively, with the SNAP group featuring a significantly different proportion than both A+N- and A+N+ groups (p ≤ 0.005). 2 key findings →
Participants: 201 Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
Genome-wide association studies (GWAS) of late-onset Alzheimer disease (LOAD) have consistently observed strong evidence of association with polymorphisms in APOE. 5 key findings →
Design: case-control study Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
Genetic studies of Alzheimer disease (AD) have prioritized variants in genes related to the amyloid cascade, lipid metabolism, and neuroimmune modulation. 1 key finding →
Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
The APOE epsilon4 allele appears to be associated with a higher prevalence of dementia in PD. 1 key finding →
Design: case-control study Evidence: moderate
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Free full text links and the Full text may need a subscription label come from Unpaywall, Europe PMC and OpenAlex records of free copies, checked 10 Oct 2026. A study with neither is unknown, not paywalled. Show only studies that are free to read
This is alzhub's own score. It is not an official metric, not an impact factor, and no journal, publisher or ranking body endorses it. We built it so that a reader who is not a scientist can tell a landmark trial from a conference abstract without having to already know the difference. Every point comes from one of 20 components, all of them printed on the study itself, so you can disagree with our arithmetic rather than having to trust the total.
Journals are placed in ordered tiers, never given a numeric impact factor — we could not verify current impact factors from a source we control, and an invented one would be worse than none. Tier 1 is the top-tier general journals (NEJM, The Lancet, JAMA, Nature, Science, Nature Medicine); tier 2 is the leading specialty journals; tier 3 is every other peer-reviewed journal. A separate part scores how much the journal's own papers are cited, which tells the tier-3 journals apart.
Two rules we don't bend. First, we never fill in a missing value: if a record does not state a sample size or a design, that component scores zero, and if we simply have no data for a part, such as a citation count, that part is left out and the study is scored on the parts we could check. The study card says which. Second, anything that is not a peer-reviewed article is capped at 16/100 and carries a warning chip — so a conference abstract or a company press release can never outrank a peer-reviewed paper, no matter how good it looks.
We rank a rigorous null result — a good trial showing that something does not work — above an early positive finding. Someone deciding whether to buy a supplement is served by that, and the rigour is already counted by the design and journal components.
The score is computed from the published data alone and is reproducible: the same file always yields the same numbers.
See the whole rubric drawn out → — four charts covering all 27,380 studies: how the scores are spread and where the cap bites, which of the 20 components the library is strong and weak on, which subjects rest on stronger evidence, and what kinds of study each subject is actually built from.
This is a large sample of the Alzheimer's literature, not an exhaustive index of it. It holds 27,380 records, built mostly from automated pulls of Europe PMC (60.6% of the library) and OpenAlex (18.6%), plus smaller pulls from PubMed, Crossref and medRxiv. If a study, a drug, or a finding isn't here, that is not evidence it doesn't exist in the literature — it may simply not have been pulled in yet.
1,032 records (3.8% of the library) are not peer-reviewed — 962 of those are preprints posted before any journal review, and the rest are conference abstracts, regulatory notices and reports. Every study card on this page states its status plainly, and the score above is capped for anything that isn't a peer-reviewed article.
See the full, machine-readable breakdown of this library's coverage →