Cited by 169Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsCognitive Abilities and Testing

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APOE-related risk of mild cognitive impairment and dementia for prevention trials: An analysis of four cohorts

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Abstract

BACKGROUND: With the onset of prevention trials for individuals at high risk for Alzheimer disease, there is increasing need for accurate risk prediction to inform study design and enrollment, but available risk estimates are limited. We developed risk estimates for the incidence of mild cognitive impairment (MCI) or dementia among cognitively unimpaired individuals by APOE-e4 dose for the genetic disclosure process of the Alzheimer's Prevention Initiative Generation Study, a prevention trial in cognitively unimpaired APOE-e4/e4 homozygote individuals. METHODS AND FINDINGS: We included cognitively unimpaired individuals aged 60-75 y, consistent with Generation Study eligibility criteria, from the National Alzheimer's Coordinating Center (NACC) (n = 5,073, 158 APOE-e4/e4), the Rotterdam Study (n = 6,399, 156 APOE-e4/e4), the Framingham Heart Study (n = 4,078, 67 APOE-e4/e4), and the Sacramento Area Latino Study on Aging (SALSA) (n = 1,294, 11 APOE-e4/e4). We computed stratified cumulative incidence curves by age (60-64, 65-69, 70-75 y) and APOE-e4 dose, adjusting for the competing risk of mortality, and determined risk of MCI and/or dementia by genotype and baseline age. We also used subdistribution hazard regression to model relative hazard based on age, APOE genotype, sex, education, family history of dementia, vascular risk, subjective memory concerns, and baseline cognitive performance. The four cohorts varied considerably in age, education, ethnicity/race, and APOE-e4 allele frequency. Overall, cumulative incidence was uniformly higher in NACC than in the population-based cohorts. Among APOE-e4/e4 individuals, 5-y cumulative incidence was as follows: in the 60-64-y age stratum, it ranged from 0% to 5.88% in the three population-based cohorts versus 23.06% in NACC; in the 65-69-y age stratum, from 9.42% to 10.39% versus 34.62%; and in the 70-75-y age stratum, from 18.64% to 33.33% versus 38.34%. Five-year incidence of dementia was negligible except for APOE-e4/e4 individuals and those over 70 y. Lifetime incidence (to age 80-85 y) of MCI or dementia for the APOE-e4/e4 individuals in the long-term Framingham and Rotterdam cohorts was 34.69%-38.45% at age 60-64 y, 30.76%-40.26% at 65-69 y, and 33.3%-35.17% at 70-75 y. Confidence limits for these estimates are often wide, particularly for APOE-e4/e4 individuals and for the dementia outcome at 5 y. In regression models, APOE-e4 dose and age both consistently increased risk, as did lower education, subjective memory concerns, poorer baseline cognitive performance, and family history of dementia. We discuss several limitations of the study, including the small numbers of APOE-e4/e4 individuals, missing data and differential dropout, limited ethnic and racial diversity, and differences in definitions of exposure and outcome variables. CONCLUSIONS: Estimates of the absolute risk of MCI or dementia, particularly over short time intervals, are sensitive to sampling and a variety of methodological factors. Nonetheless, such estimates were fairly consistent across the population-based cohorts, and lower than those from a convenience cohort and those estimated in prior studies-with implications for informed consent and design for clinical trials targeting high-risk individuals.

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Crossref · 10.1371/journal.pmed.1002254

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Fig 1 Cumulative incidence curves, adjusting for competing risk of mortality, for mild cognitive impairment or dementia by baseline age and APOE-e4 dose. Note that the strata shown are not independent for the Rotterdam and Framingham cohorts (see text). MCI, mild cognitive impairment; NACC, National Alzheimer’s Coordinating Center; RS, Rotterdam Study; SALSA, Sacramento Area Latino Study on Aging.
Fig 1 Cumulative incidence curves, adjusting for competing risk of mortality, for mild cognitive impairment or dementia by baseline age and APOE-e4 dose. Note that the strata shown are not independent for the Rotterdam and Framingham cohorts (see text). MCI, mild cognitive impairment; NACC, National Alzheimer’s Coordinating Center; RS, Rotterdam Study; SALSA, Sacramento Area Latino Study on Aging.CC BY · PubMed Central
Fig 2 Cumulative incidence curves, adjusting for competing risk of mortality, for dementia by baseline age and APOE-e4 dose. Note that the strata shown are not independent for the Rotterdam and Framingham cohorts (see text). NACC, National Alzheimer’s Coordinating Center; RS, Rotterdam Study; SALSA, Sacramento Area Latino Study on Aging.
Fig 2 Cumulative incidence curves, adjusting for competing risk of mortality, for dementia by baseline age and APOE-e4 dose. Note that the strata shown are not independent for the Rotterdam and Framingham cohorts (see text). NACC, National Alzheimer’s Coordinating Center; RS, Rotterdam Study; SALSA, Sacramento Area Latino Study on Aging.CC BY · PubMed Central
Fig 3 Lifetime (to age 80–85 y) cumulative incidence curves, adjusting for competing risk of mortality, for mild cognitive impairment or dementia by baseline age and APOE-e4 dose. Note that the strata shown are not independent (see text). MCI, mild cognitive impairment.
Fig 3 Lifetime (to age 80–85 y) cumulative incidence curves, adjusting for competing risk of mortality, for mild cognitive impairment or dementia by baseline age and APOE-e4 dose. Note that the strata shown are not independent (see text). MCI, mild cognitive impairment.CC BY · PubMed Central
Fig 4 Lifetime (to age 80–85 y) cumulative incidence curves, adjusting for competing risk of mortality, for dementia by baseline age and APOE-e4 dose. Note that the strata shown are not independent (see text).
Fig 4 Lifetime (to age 80–85 y) cumulative incidence curves, adjusting for competing risk of mortality, for dementia by baseline age and APOE-e4 dose. Note that the strata shown are not independent (see text).CC BY · PubMed Central

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Metadata

Authors
Qian, J., Wolters, F. J., Beiser, A., Haan, M., Ikram, M. A., Karlawish, J., Langbaum, J. B., Neuhaus, J. M., Reiman, E. M., Roberts, J. S., Seshadri, S., Tariot, P. N., Woods, B. M., Betensky, R. A., & Blacker, D.
Affiliations
  • University of Massachusetts Amherst (US)
  • Erasmus MC (NL)
  • Boston University (US)
  • University of California, San Francisco (US)
  • University of Pennsylvania (US)
  • Banner Alzheimer’s Institute (US)
  • Translational Genomics Research Institute (US)
  • University of Michigan (US)
  • Harvard University (US)
Corresponding author
Blacker, Deborah
Venue
PLOS Medicine
Published
2017-03-21
Volume
14
Issue
3
Pages
e1002254
ISSN
  • 1549-1277 (ISSN-L)
  • 1549-1676
OpenAlex
W2600450442
Cited by
169
References
74
Citations by year
2026: 10 · 2025: 23 · 2024: 15 · 2023: 15 · 2022: 12 · 2021: 35 · 2020: 20 · 2019: 19 · 2018: 12 · 2017: 8
FWCI
13.24
Type
journal article
Language
en
Open access
Locations
  • PLoS Medicine (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • EUR Research Repository (Erasmus University Rotterdam) (publishedVersion, other-oa)
  • UA Campus Repository (The University of Arizona) (acceptedVersion, cc-by)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
  • National University of Singapore (submittedVersion, cc-by)
  • EUR Research Repository (Erasmus University Rotterdam) (submittedVersion, other-oa)
  • RePub (Erasmus University Rotterdam) (submittedVersion, other-oa)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • eScholarship (California Digital Library) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
Funders
  • National Institute on Aging (P30AG053760, P30AG010129, R01AG012975, U01AG016976, P30AG010124, R21AG053695, UF1AG046150, P30AG019610, P50AG005134, R01AG008122, P01AG036694)
  • National Institute of Neurological Disorders and Stroke (R01NS017950)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Alzheimer's disease research and treatments
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Cognitive Abilities and Testing
Keywords
APOE ε4, Alzheimer's disease, mild cognitive impairment, dementia, risk prediction, cumulative incidence, cognitively unimpaired older adults, competing risk of death, family history of dementia, vascular risk
MeSH terms
Aged, Apolipoproteins E, Dementia, Female, Gene Frequency, Genotype, Humans, Male, Middle Aged, Netherlands, Risk Factors, United States, Cohort Studies, Cognitive Dysfunction

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