Journal of Neurology

, Volume 261, Issue 6, pp 1187–1195

The screening of Alzheimer’s patients with CSF biomarkers, modulates the distribution of APOE genotype: impact on clinical trials

  • Julien Dumurgier
  • Jean-Louis Laplanche
  • Francois Mouton-Liger
  • Pauline Lapalus
  • Sandrine Indart
  • Magali Prévot
  • Katell Peoc’h
  • Jacques Hugon
  • Claire Paquet
Original Communication
  • 305 Downloads

Abstract

Polymorphism of the apolipoprotein E gene (APOE) plays a role in the level of neuropathological lesions and in drug response in Alzheimer’s disease (AD). The aim of this study was to investigate whether the selection of AD patients based on cerebrospinal fluid (CSF) biomarkers assessment may be biased by their APOE distribution. We studied the relationships between APOE genotype and CSF biomarkers levels in a total of 432 patients (AD, n = 244; non-AD, n = 188) explored for cognitive disorders. We studied the distribution of APOE genotypes among AD patient subgroups selected by various cut-offs of CSF biomarkers. Strategies of screening based on CSF Aβ1–42 lead to overselection of ε4/ε4 patients in the AD group. Screening based on tau levels did not change Apoe4 distribution in the AD group. CSF Aβ1–42 discriminated better AD patients with at least one ε4 than AD patients with no ε4. A strong allele-effect relationship was detected between APOE genotype and CSF amyloid-β (Aβ1–42) in AD patients. Selecting AD patients on CSF amyloid levels only may create an overselection of ε4/ε4 carriers, and might potentially bias the population of patients included in clinical trial studies.

Keywords

Alzheimer’s disease Apolipoprotein E Biomarkers Cerebrospinal fluid Clinical trial design 

Supplementary material

415_2014_7335_MOESM1_ESM.doc (192 kb)
Supplementary material 1 (DOC 192 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Julien Dumurgier
    • 1
    • 2
  • Jean-Louis Laplanche
    • 3
  • Francois Mouton-Liger
    • 2
  • Pauline Lapalus
    • 1
  • Sandrine Indart
    • 1
  • Magali Prévot
    • 1
  • Katell Peoc’h
    • 3
  • Jacques Hugon
    • 1
    • 2
  • Claire Paquet
    • 1
    • 2
  1. 1.Memory Clinical Center CMRR Paris Nord Ile-de-FranceSaint Louis-Lariboisiere, Fernand Widal Hospital, AP-HPParisFrance
  2. 2.INSERM U942Saint Louis-Lariboisiere, Fernand Widal HospitalParisFrance
  3. 3.Department of BiochemistrySaint Louis-Lariboisiere, Fernand Widal Hospital, AP-HP, PRES Sorbonne-Paris CitéParisFrance

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