Evidence map›Paper›PMID 23447138›Full record

ArticleAnnals of neurology2013

Plasma apolipoprotein A1 as a biomarker for Parkinson disease.

Judy K Qiang, Yvette C Wong, Andrew Siderowf, Howard I Hurtig, Sharon X Xie, Virginia M-Y Lee, John Q Trojanowski, Dora Yearout, James B Leverenz, Thomas J Montine and 6 more

Open access · greenAbstract read
In one paragraph

Article in Annals of neurology, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 71 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
71citing papers in PubMed, 1 pooled it
6.7field-weighted citation impact, top 3% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

71 citing papers in PubMed, 1 synthesis or guideline pooled it, 138 citations in OpenAlex.

  1. Plasma apolipoprotein A1 associates with age at onset and motor severity in early Parkinson's disease patients.Movement disorders : official journal of the Movement Disorder Society · 2015
    Pooled it
  2. Article
  3. Article
  4. Review
  5. Review
  6. Apolipoprotein A (ApoA) in Neurological Disorders: Connections and Insights.International journal of molecular sciences · 2025
    Review
  7. Article
  8. Article
  9. A Rapid and Modular Nanobody Assay for Plug-and-Play Antigen Detection.bioRxiv : the preprint server for biology · 2025
    Article
  10. Article
  11. Article
  12. Review
  13. Parkinson's Disease: Biomarkers for Diagnosis and Disease Progression.International journal of molecular sciences · 2024
    Review
  14. Lipoprotein Particles in Cerebrospinal Fluid.Arteriosclerosis, thrombosis, and vascular biology · 2024
    Review
  15. Article
  16. Article
  17. Review
  18. Article
  19. Article
  20. Review

11 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

16 authors at 4 institutions in 1 country.

Judy K QiangDepartment of Neurology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA.
Yvette C Wong
Andrew Siderowf
Howard I Hurtig
Sharon X Xie
Virginia M-Y Lee
John Q Trojanowski
Dora Yearout
James B Leverenz
Thomas J Montine
Matt Stern
Susan Mendick
Danna Jennings
Cyrus Zabetian
Ken Marek
Alice S Chen-Plotkin
University of Pennsylvania · USInstitute for Neurodegenerative Disorders · USVA Puget Sound Health Care System · USUniversity of Washington · US

Funding

Project IV: "Alpha-Synuclein Strains & Diverse Synucleinopathies"P50NS053488 · NINDS · UNIVERSITY OF PENNSYLVANIA · PI TROJANOWSKI, JOHN Q. · 2007 to 2017
$20.9M
Udall Center Director's meeting poster awardP50NS062684 · NINDS · UNIVERSITY OF WASHINGTON · PI MONTINE, THOMAS J · 2009 to 2020
$18.3M
Using Multiplex Families to map Genes that Modify Susceptibility and Age at OnsetR01NS065070 · NINDS · UNIVERSITY OF WASHINGTON · PI ZABETIAN, CYRUS P · 2009 to 2012
$2.0M
Unbiased Approaches to Novel Biomarker Discovery in Parkinson's DiseaseU01NS082134 · NINDS · UNIVERSITY OF PENNSYLVANIA · PI CHEN-PLOTKIN, ALICE S · 2012 to 2016
$1.8M
Regulation of gene expression in frontotemporal dementia: A genome-wide approachK08AG033101 · NIA · UNIVERSITY OF PENNSYLVANIA · PI CHEN-PLOTKIN, ALICE S · 2008 to 2012
$640k
Genetic Risk Factors for Parkinson's DiseaseI01BX000531 · VA · VA PUGET SOUND HEALTHCARE SYSTEM · PI ZABETIAN, CYRUS P · 2009 to 2013
–
BLRD VA I01 BX000531NIA NIH HHS AG-033101NIA NIH HHS K08 AG033101NINDS NIH HHS P50 NS053488NINDS NIH HHS P50 NS062684NINDS NIH HHS R01 NS065070NINDS NIH HHS U01 NS082134NINDS NIH HHS U01NS082134
6 · The paper itself

Abstract

objectiveTo identify plasma-based biomarkers for Parkinson disease (PD) risk.

methodsIn a discovery cohort of 152 PD patients, plasma levels of 96 proteins were measured by multiplex immunoassay; proteins associated with age at PD onset were identified by linear regression. Findings from discovery screening were then assessed in a second cohort of 187 PD patients, using a different technique. Finally, in a third cohort of at-risk, asymptomatic individuals enrolled in the Parkinson's Associated Risk Study (PARS, n = 134), plasma levels of the top candidate biomarker were measured, and dopamine transporter (DAT) imaging was performed, to evaluate the association of plasma protein levels with dopaminergic system integrity.

resultsOne of the best candidate protein biomarkers to emerge from discovery screening was apolipoprotein A1 (ApoA1; p = 0.001). Low levels of ApoA1 correlated with earlier PD onset, with a 26% decrease in risk of developing PD associated with each tertile increase in ApoA1 (Cox proportional hazards, p < 0.001, hazard ratio = 0.742). The association between plasma ApoA1 levels and age at PD onset was replicated in an independent cohort of PD patients (p < 0.001). Finally, in the PARS cohort of high-risk, asymptomatic subjects, lower plasma levels of ApoA1 were associated with greater putaminal DAT deficit (p = 0.037).

interpretationLower ApoA1 levels correlate with dopaminergic system vulnerability in symptomatic PD patients and in asymptomatic individuals with physiological reductions in dopamine transporter density consistent with prodromal PD. Plasma ApoA1 may be a new biomarker for PD risk.

Indexed as

AgedAge of OnsetApolipoprotein A-IBiomarkersCohort StudiesDopamine Plasma Membrane Transport ProteinsFemaleHumansMaleMiddle AgedMotor ActivityParkinson DiseaseRisk FactorsSex FactorsStatistics as TopicStatistics, Nonparametric2-carbomethoxy-8-(3-fluoropropyl)-3-(4-iodophenyl)tropaneApolipoprotein A-IBiomarkersDopamine Plasma Membrane Transport ProteinsTropanes

Identifiers

PMID23447138
PMCPMC3773265
OpenAlexW1525787712

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.