Cited by 373Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsMedical Imaging Techniques and Applications

The DOI matches its Crossref record; 50 of the 54 references it cites were found in a registry or an index; 24 of the 27 sources its claims cite were checked for support.

Sex Differences in the Association of Global Amyloid and Regional Tau Deposition Measured by Positron Emission Tomography in Clinically Normal Older Adults

Open access

Abstract

Importance: Mounting evidence suggests that sex differences exist in the pathologic trajectory of Alzheimer disease. Previous literature shows elevated levels of cerebrospinal fluid tau in women compared with men as a function of apolipoprotein E (APOE) ε4 status and β-amyloid (Aβ). What remains unclear is the association of sex with regional tau deposition in clinically normal individuals. Objective: To examine sex differences in the cross-sectional association between Aβ and regional tau deposition as measured with positron emission tomography (PET). Design, Setting and Participants: This is a study of 2 cross-sectional, convenience-sampled cohorts of clinically normal individuals who received tau and Aβ PET scans. Data were collected between January 2016 and February 2018 from 193 clinically normal individuals from the Harvard Aging Brain Study (age range, 55-92 years; 118 women [61%]) who underwent carbon 11-labeled Pittsburgh Compound B and flortaucipir F18 PET and 103 clinically normal individuals from the Alzheimer's Disease Neuroimaging Initiative (age range, 63-94 years; 55 women [51%]) who underwent florbetapir and flortaucipir F 18 PET. Main Outcomes and Measures: A main association of sex with regional tau in the entorhinal cortices, inferior temporal lobe, and a meta-region of interest, which was a composite of regions in the temporal lobe. Associations between sex and global Aβ as well as sex and APOE ε4 on these regions after controlling for age were also examined. Results: The mean (SD) age of all individuals was 74.2 (7.6) years (81 APOE ε4 carriers [31%]; 89 individuals [30%] with high Aβ). There was no clear association of sex with regional tau that was replicated across studies. However, in both cohorts, clinically normal women exhibited higher entorhinal cortical tau than men (meta-analytic estimate: β [male] = -0.11 [0.05]; 95% CI, -0.21 to -0.02; P = .02), which was associated with individuals with higher Aβ burden. A sex by APOE ε4 interaction was not associated with regional tau (meta-analytic estimate: β [male, APOE ε4+] = -0.15 [0.09]; 95% CI, -0.32 to 0.01; P = .07). Conclusions and Relevance: Early tau deposition was elevated in women compared with men in individuals on the Alzheimer disease trajectory. These findings lend support to a growing body of literature that highlights a biological underpinning for sex differences in Alzheimer disease risk.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

In two clinically normal older-adult cohorts, women showed higher entorhinal cortical tau than men, particularly among individuals with higher global amyloid burden, although sex differences were not consistently replicated across all regional tau measures. The findings suggest early tau deposition may be elevated in women on the Alzheimer disease trajectory.

Key findings

  • There was no clear association of sex with regional tau that replicated across studies, but clinically normal women exhibited higher entorhinal cortical tau than men in both cohorts (meta-analytic estimate: β [male] = −0.11 [0.05]; 95% CI, −0.21 to −0.02; P = .02).
  • The sex difference in entorhinal tau was associated with higher Aβ burden: meta-analytic sex × Aβ interaction β (male, Aβ+) = −0.19 (0.06); 95% CI, −0.32 to −0.07; P = .002.
  • A sex × APOE ε4 interaction was not significantly associated with regional tau (meta-analytic estimate: β [male, APOE ε4+] = −0.15 [0.09]; 95% CI, −0.32 to 0.01; P = .07).
  • In ADNI only, a sex × APOE ε4 interaction was found for the tau meta-ROI (β = −0.30; 95% CI, −0.58 to −0.02; P = .04), with a stronger APOE ε4–tau association among women than men.

Methods

  • Cross-sectional study of two convenience-sampled clinically normal cohorts: 193 individuals from the Harvard Aging Brain Study (HABS; age range, 55–92 years; 118 women [61%]) and 103 from the Alzheimer’s Disease Neuroimaging Initiative (ADNI; age range, 63–94 years; 55 women [51%]).
  • Participants received tau PET with [18F]flortaucipir and Aβ PET ([11C]PiB in HABS; [18F]florbetapir in ADNI); tau regions included entorhinal cortex, inferior temporal cortex, a temporal meta-ROI, and extratemporal precuneus and superior parietal regions.
  • Hierarchical linear regressions examined sex, Aβ, and APOE ε4 associations with regional tau after adjusting for age and scan interval, followed by fixed-effect meta-analysis of standardized coefficients across cohorts.

Limitations

  • The paper states that both cohorts are convenience samples with recruitment and sampling biases that may limit generalizability; it also notes possible sex-specific partial volume effects, though no association of gray matter volume with the findings was found.
  • The paper states that exploratory analyses of sex × entorhinal tau on cognitive decline were null and should be interpreted cautiously because of limited power and follow-up; it also notes unresolved survival bias and limited power to examine APOE and 3-way interactions.
  • Evident from the text: the cross-sectional design cannot establish temporal or causal ordering, and APOE genotype data were missing for some participants (n = 34 in HABS; n = 7 in ADNI).

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Integrity signals

Registry

Crossref · 10.1001/jamaneurol.2018.4693

Cites

50 of 50 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

33 Own result · 11 Own method · 6 Partly supported · 6 Own interpretation · 3 Supported · 2 No basis given · 1 Supported so far · 1 Sources not found · 1 Not checked yet · accuracy not yet measured

Show all 39 claims

  • Probably not a substantial claim. 16
  • It may state two separate claims as one. 12
25 of 25
  • The paper relies on this without support.

    The association of sex with regional tau deposition in clinically normal individuals remains unclear, and studies have yet to fully explore this notion.

    “What remains unclear is the association of sex with regional tau deposition in clinically normal individuals.”
    “To our knowledge, studies have yet to fully explore this notion,8 with little attention paid to elucidating sex differences in regional tau deposition in the context of Aβ burden and APOE ε4.”
1 of 1

Self-check

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

Each contradiction between two passages listed here was confirmed by an independent check.

3 of 3

Citations

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Metadata

Authors
Buckley, R. F., Mormino, E. C., Rabin, J. S., Hohman, T. J., Landau, S., Hanseeuw, B. J., Jacobs, H. I. L., Papp, K. V., Amariglio, R. E., Properzi, M. J., Schultz, A. P., Kirn, D., Scott, M. R., Hedden, T., Farrell, M., Price, J., Chhatwal, J., Rentz, D. M., Villemagne, V. L., Johnson, K. A., & Sperling, R. A.
Affiliations
  • Brigham and Women's Hospital (US)
  • Stanford University (US)
  • Harvard University (US)
  • Vanderbilt University (US)
  • University of California, Berkeley (US)
  • Cliniques Universitaires Saint-Luc (BE)
  • Austin Hospital (AU)
Corresponding author
Sperling, Reisa A.
Venue
JAMA Neurology
Published
2019-05-01
Volume
76
Issue
5
Pages
542
ISSN
2168-6149 (ISSN-L)
OpenAlex
W2913192031
Cited by
373
References
54
Citations by year
2026: 58 · 2025: 71 · 2024: 37 · 2023: 61 · 2022: 44 · 2021: 47 · 2020: 42 · 2019: 13
FWCI
25.58
Type
journal article
Language
en
Open access
Locations
  • JAMA Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • Research Publications (Maastricht University) (publishedVersion, other-oa)
  • Europe PMC (PubMed Central) (submittedVersion)
  • PubMed Central (submittedVersion)
  • DIAL (Catholic University of Leuven) (submittedVersion, other-oa)
  • Research Publications (Maastricht University) (submittedVersion, other-oa)
Funders
  • Massachusetts General Hospital
  • Vanderbilt University
  • Vanderbilt University Medical Center
  • Universiteit Maastricht
  • Centre d'Imagerie BioMédicale
  • National Institutes of Health (5k01ag049164-06, 5r21ag059941-02, 5k01ag051718-05, 5p30ag062421-07)
  • Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital
  • National Institute on Aging (P30-AG062421, R21-AG059941, R01AG059716, K24 AG035007, R01 AG046396, K01-AG049164), K99AG061238, K01‐AG051718, P01AG036694, R00AG061238)
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
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Medical Imaging Techniques and Applications
Keywords
sex differences, Alzheimer's disease, amyloid-beta, APOE ε4, entorhinal cortex, Pittsburgh compound B, flortaucipir, florbetapir, amyloid PET, tau PET, neurodegeneration biomarkers, temporal lobe, brain aging
MeSH terms
Aged, Aged, 80 and over, Aniline Compounds, Brain, Carbolines, Contrast Media, Cross-Sectional Studies, Ethylene Glycols, Female, Humans, Male, Middle Aged, Sex Factors, Temporal Lobe, Thiazoles, Amyloid beta-Peptides, tau Proteins, Entorhinal Cortex, Positron-Emission Tomography, Apolipoprotein E4, Healthy Volunteers

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