28,180 Alzheimer's and dementia studies in plain English, each scored out of 100.
Early-onset cataract and Alzheimer's disease occur with high frequency in Down syndrome (trisomy 21), the most common chromosome duplication in human live births. 2 key findings →
Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
Human carbonyl reductase (CBR) belongs to a group of NADPH-dependent enzymes called aldo-keto reductases. 1 key finding →
Evidence: low
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BACE2 is homologous to BACE1, a beta-secretase that is involved in the amyloidogenic pathway of amyloid precursor protein (APP), and maps to the Down syndrome critical region of chromosome 21. 1 key finding →
Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
We previously observed low level mosaicism (2-4% normal cells) in phytohemagglutinin-stimulated peripheral blood lymphocytes (PBL) in 29% of a small group of elderly persons with Down syndrome (DS). 3 key findings →
Evidence: low
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The decrease in the number of neurons free of neurofibrillary changes, neurons with neurofibrillary degeneration, and the total volume of beta-amyloid (A beta) deposits in the amygdala of people with Down syndrome and in late stages of Alzheimer disease were estimated by using morphometry and regression analysis. 3 key findings →
Evidence: low
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The cause(s) of Alzheimer disease (AD) remain unknown. 5 key findings →
Participants: 21 Evidence: low
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Down syndrome (DS) is the most common genetically defined cause of intellectual disability and accounts for over 50% of the cases of Alzheimer-type dementia in persons younger than 50 years of age. 2 key findings →
Evidence: low
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The present authors provide preliminary evidence for the validity and reliability of the CAS-ID. 3 key findings →
Participants: 30 Evidence: low
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A comprehensive baseline of emotional functioning was established for adults with Down syndrome. 2 key findings →
Participants: 30 Evidence: low
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The human ETS2 gene, a member of the ETS gene family, with sequence homology with the retroviral ets sequence of the avian erythroblastosis retrovirus E26 is located on chromosome 21. 5 key findings →
Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
Age-related declines in language and other neuropsychological variables were examined in 60 adults with Down syndrome. 2 key findings →
Participants: 60 Evidence: low
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Frequency of two mutations associated with ASA pseudodeficiency in the Croatian population is slightly below the range reported for other populations. 5 key findings →
Participants: 125 Evidence: low
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In Down syndrome (DS), enhanced apoptosis (programmed cell death) may play a role in the pathogenesis of characteristic early mental retardation and precocious neurodegeneration of Alzheimer-type. 5 key findings →
Evidence: low
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Down syndrome (trisomy 21) is a genetic disease with developmental brain abnormalities resulting in early mental retardation and precocious, age dependent Alzheimer-type neurodegeneration. 3 key findings →
Evidence: low
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Tau pathology is a major age-related event in Down syndrome with Alzheimer’s disease (DS-AD). 4 key findings →
Evidence: low
Full summary, score breakdown and related studies → Original source
Isoprostanes are a recently discovered group of prostaglandin isomers. 2 key findings →
Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
The brains of individuals with Down's syndrome in their 40's and 50's begin to develop changes that are otherwise seen only in patients with Alzheimer disease. 5 key findings →
Evidence: low
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The main purpose of this study was to investigate differences regarding endogenous opioids in post-mortem frontal cortex of adult patients with Down syndrome (DS), patients with Alzheimer disease (AD) and neurologically healthy persons, respectively, using specific radioimmunoassays. 2 key findings →
Evidence: low
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Two groups of subjects, 14 young (ages 20 to 31 years) and 14 adults (ages 32 to 54 years), both groups with Down Syndrome, were examined on a matching and naming olfactory task. 1 key finding →
Participants: 14 Evidence: low
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Platelets are the main source of 5-hydroxytryptamine (5-HT) and amyloid precursor protein (APP) found in plasma. 2 key findings →
Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
The humble success of current therapeutic strategies along with the lack of basic knowledge of the brain disease mechanisms calls for alternatives that benefit patients in the present moment. 2 key findings →
Evidence: low
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Reduced telomere length has recently been reported in T lymphocytes of individuals with trisomy 21 Down syndrome (DS) and dementia. 2 key findings →
Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
Down syndrome (DS) is an aneuploidy syndrome that is caused by trisomy for human chromosome 21 resulting in a characteristic cognitive and behavioral phenotype, which includes executive functioning and adaptive behavior difficulties possibly due to prefrontal cortex (PFC) deficits. 1 key finding →
Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
Individuals with Down syndrome develop neuropathologic and in some cases clinical evidence of Alzheimer disease after age 40. 5 key findings →
Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
Human trisomy 21 is the most frequent live-born human aneuploidy and causes a constellation of disease phenotypes classified as Down syndrome, which include heart defects, myeloproliferative disorder, cognitive disabilities and Alzheimer-type neurodegeneration. 2 key findings →
Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
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 28,180 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 28,180 records, built mostly from automated pulls of Europe PMC (61.7% of the library) and OpenAlex (18.1%), 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.
1,034 records (3.7% 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 →