Cited by 691Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsLipoproteins and Cardiovascular Health

Apolipoprotein E Genotype and Sex Risk Factors for Alzheimer Disease: A Meta-analysis

Open access
Neu, Scott C., Pa, Judy, Kukull, Walter, Beekly, Duane, Kuzma, Amanda, Gangadharan, Prabhakaran, Wang, Li-San, Romero, Klaus +16 more·2017·JAMA Neurology

Abstract

Importance: It is unclear whether female carriers of the apolipoprotein E (APOE) ε4 allele are at greater risk of developing Alzheimer disease (AD) than men, and the sex-dependent association of mild cognitive impairment (MCI) and APOE has not been established. Objective: To determine how sex and APOE genotype affect the risks for developing MCI and AD. Data Sources: Twenty-seven independent research studies in the Global Alzheimer's Association Interactive Network with data on nearly 58 000 participants. Study Selection: Non-Hispanic white individuals with clinical diagnostic and APOE genotype data. Data Extraction and Synthesis: Homogeneous data sets were pooled in case-control analyses, and logistic regression models were used to compute risks. Main Outcomes and Measures: Age-adjusted odds ratios (ORs) and 95% confidence intervals for developing MCI and AD were calculated for men and women across APOE genotypes. Results: Participants were men and women between ages 55 and 85 years. Across data sets most participants were white, and for many participants, racial/ethnic information was either not collected or not known. Men (OR, 3.09; 95% CI, 2.79-3.42) and women (OR, 3.31; CI, 3.03-3.61) with the APOE ε3/ε4 genotype from ages 55 to 85 years did not show a difference in AD risk; however, women had an increased risk compared with men between the ages of 65 and 75 years (women, OR, 4.37; 95% CI, 3.82-5.00; men, OR, 3.14; 95% CI, 2.68-3.67; P = .002). Men with APOE ε3/ε4 had an increased risk of AD compared with men with APOE ε3/ε3. The APOE ε2/ε3 genotype conferred a protective effect on women (OR, 0.51; 95% CI, 0.43-0.61) decreasing their risk of AD more (P value = .01) than men (OR, 0.71; 95% CI, 0.60-0.85). There was no difference between men with APOE ε3/ε4 (OR, 1.55; 95% CI, 1.36-1.76) and women (OR, 1.60; 95% CI, 1.43-1.81) in their risk of developing MCI between the ages of 55 and 85 years, but women had an increased risk between 55 and 70 years (women, OR, 1.43; 95% CI, 1.19-1.73; men, OR, 1.07; 95% CI, 0.87-1.30; P = .05). There were no significant differences between men and women in their risks for converting from MCI to AD between the ages of 55 and 85 years. Individuals with APOE ε4/ε4 showed increased risks vs individuals with ε3/ε4, but no significant differences between men and women with ε4/ε4 were seen. Conclusions and Relevance: Contrary to long-standing views, men and women with the APOE ε3/ε4 genotype have nearly the same odds of developing AD from age 55 to 85 years, but women have an increased risk at younger ages.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1001/jamaneurol.2017.2188

Cites

74 of 74 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • APOE-e4 was related to higher Alzheimer's risk in women than men between ages 55 and 70.

    “APOE-e4 was related to higher Alzheimer's risk in women than men between ages 55 to 70”

    From 2023 Alzheimer's disease facts and figures (2023) · cites this paper as [288]

    The Results and Discussion report higher Alzheimer’s disease risk in APOE ε3/ε4 women than men at ages 65–75, not 55–70. The 55–70 age range applies to higher risk of mild cognitive impairment. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Carrying one APOE4 allele increases the risk of AD by 3-4 times, and carrying two alleles increases the risk by 9-15 times.

    “Carrying one APOE4 allele increases the risk of AD by 3–4 times, and carrying two alleles increases the risk by 9–15 times.168”

    From Role of neuroinflammation in neurodegeneration development (2023) · cites this paper as [168]

    The Results report AD odds ratios of 3.09 for men and 3.31 for women with one APOE ε4 allele, relative to ε3/ε3, among participants aged 55–85. The Discussion says two copies confer greater AD risk than one, but the passages found do not establish the claimed 9–15-fold figure. The cited estimates are odds ratios in a specified age group, not unqualified risk multipliers. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Women are more vulnerable to effects of APOE4 on memory decline, risk for AD dementia, and neuropathology.

    “Women are more vulnerable to effects of APOE4 on memory decline [45] as well as risk for AD dementia [16] and neuropathology [46], and more limited data suggest that APOE2 also confers greater protection against AD risk for women than men [16].”

    From Effects of APOE2 and APOE4 on brain microstructure in older adults: modification by age, sex, and cognitive status (2024) · cites this paper as [16]

    The Results report greater AD risk for APOE ε3/ε4 women than men at ages 65–75, and greater protection from AD for women with APOE ε2/ε3. But they found no sex difference in AD risk across ages 55–85, so the unqualified statement that women are more vulnerable to APOE4-associated AD risk overstates the finding. The memory-decline and neuropathology clauses carry other citations and are not judged here. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • APOE-e4 was related to higher Alzheimer's risk in women than men between ages 55 and 70, when APOE is thought to exert its largest effects.

    “That is, APOE‐e4 was related to higher Alzheimer's risk in women than men between ages 55 and 70, when APOE is thought to exert its largest effects.”

    From 2024 Alzheimer's disease facts and figures (2024) · cites this paper as [314]

    The Results and Discussion report higher Alzheimer’s disease risk for APOE ε3/ε4 women than men at ages 65–75. The 55–70 range instead applies to higher risk of mild cognitive impairment, not Alzheimer’s disease. The cited passages also do not establish that APOE exerts its largest effects at ages 55–70. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • A recent meta-analysis found no overall difference between men and women in the association between APOE-e4 and Alzheimer's dementia, but age played an interactive role.

    “A recent meta-analysis found no difference between men and women in the association between APOE-e4 and Alzheimer's dementia overall, although age played an interesting interactive role.”

    From 2023 Alzheimer's disease facts and figures (2023) · cites this paper as [288]

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Neu, S. C., Pa, J., Kukull, W., Beekly, D., Kuzma, A., Gangadharan, P., Wang, L.-S., Romero, K., Arneric, S. P., Redolfi, A., Orlandi, D., Frisoni, G. B., Au, R., Devine, S., Auerbach, S., Espinosa, A., Boada, M., Ruiz, A., Johnson, S. C., Koscik, R., Wang, J.-J., Hsu, W.-C., Chen, Y.-L., & Toga, A. W.
Affiliations
  • University of Southern California (US)
  • University of Washington (US)
  • University of Pennsylvania (US)
  • Critical Path Institute (US)
  • Coalition Against Major Disease, Critical Path Institute, Tucson, Arizona
  • Centro San Giovanni di Dio Fatebenefratelli (IT)
  • University of Geneva (CH)
  • Boston University (US)
  • Fundació ACE (ES)
  • Research Center and Memory Clinic, Fundació ACE, Institut Català de Neurociències Aplicades, Barcelona, Spain
  • University of Wisconsin–Madison (US)
  • Chang Gung University (TW)
  • Chang Gung Memorial Hospital (TW)
Corresponding author
Toga, Arthur W.
Venue
JAMA Neurology
Published
2017-10-01
Volume
74
Issue
10
Pages
1178
ISSN
2168-6149 (ISSN-L)
OpenAlex
W2745657465
Cited by
674
References
74
Citations by year
2026: 74 · 2025: 81 · 2024: 74 · 2023: 93 · 2022: 78 · 2021: 96 · 2020: 69 · 2019: 67 · 2018: 37 · 2017: 3 · 2014: 1
FWCI
39.51
Type
journal article
Language
en
Open access
Locations
  • JAMA Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (UL1TR000130, 5u01ag024904-10, n01hc25195-41-0-1, UL1TR001855)
  • U.S. Food and Drug Administration (U18FD005320)
  • National Institute on Aging (U01-AG-024904, P30AG010129, P30AG010133, P30AG028383, P30AG012300, P50AG005133, U01AG016976, P50AG005131, P50AG005138, P50AG016570, P30AG010124, P50AG016573, RF1AG027161, P50AG047366, P30AG008017, P30AG010161, R01AG033040, P30AG008051, P50AG008702, R01AG016495, P50AG033514, P30AG035982, P50AG005681, P50AG005142, P50AG047270, P30AG019610, P50AG005146, P01AG003991, RF1AG054617, P30AG013846, P50AG005136, P50AG005134, P30AG013854, P50AG025688, P50AG047266, R01AG008122, R01AG027161, U24AG041689, U19AG024904, P01AG026276, P50AG023501, P50AG016574)
  • National Heart, Lung, and Blood Institute (N01-HC-025195)
  • National Institute of Neurological Disorders and Stroke (R01NS017950)
  • National Institute of Biomedical Imaging and Bioengineering (U54EB020406, P41EB015922)
  • National Center for Advancing Translational Sciences
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 › Surgery › Lipoproteins and Cardiovascular Health
Keywords
Alzheimer's disease, apolipoprotein E, APOE ε4, APOE ε2, sex differences, mild cognitive impairment, genetic risk factors
MeSH terms
Aged, Aged, 80 and over, Alzheimer Disease, Apolipoproteins E, Female, Humans, Male, Middle Aged, Risk Factors, Sex Characteristics, Logistic Models, Case-Control Studies, Databases, Factual

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review