Beta Amyloid Peptide: Research Paper : Head-to-head comparison of amplified plasmonic exosome Aβ42 platform and single-molecule array immunoassay in a memory clinic cohort

Head-to-head comparison of amplified plasmonic exosome Aβ42 platform and single-molecule array immunoassay in a memory clinic cohort

Abstract

Background: Various blood biomarkers reflecting brain amyloid-β (Aβ) load have recently been proposed with promising results. However, to date, no comparative study among blood biomarkers has been reported. Our objective is to examine the diagnostic performance and cost effectiveness of three blood biomarkers on the same cohort.

Methods: Using the same cohort (n=68), we compared the performance of the single-molecule array (Simoa)-Aβ40 and Aβ42, Aβ42/Aβ40 and the amplified plasmonic exosome (APEX)-Aβ42 blood biomarkers using amyloid PET as the reference standard. We also determined the extent to which these blood tests can reduce the recruitment cost of clinical trials by identifying Amyloid positive (Aβ+) participants.

Results: Compared to Simoa biomarkers, APEX-Aβ42 showed significantly higher correlations with amyloid PET retention values and excellent diagnostic performance (sensitivity=100%, specificity=93.3%, AUC=0.995). When utilized for clinical trial recruitment, our simulation showed that pre-screening with blood biomarkers followed by a confirmatory amyloid PET imaging would roughly half the cost (56.8% reduction for APEX-Aβ42 and 48.6% for Simoa-Aβ42/Aβ40) as compared to the situation where only PET imaging is used. Moreover, with a 100% sensitivity; APEX-Aβ42 pre-screening does not increase the required number of initial participants.

Conclusions: With its high diagnostic performance, APEX is an ideal candidate for Aβ+ subject identification, monitoring, primary care screening, and could efficiently enrich clinical trials with Aβ+ participants while halving recruitment costs.

Keywords: Alzheimer's disease; Simoa; cost-saving; exosome; plasma Abeta42/Abeta40 ratio.

This article originally appeared in the "https://pubmed.ncbi.nlm.nih.gov/33370497/" and has their copyrights. We do not claim copyright on the content. This information is for research purposes only. This Blog is made available by publishers for educational purposes only as well as to give you general information and a general understanding , not to provide specific advice. By using this blog site you understand that there is no client relationship between you and the Blog publisher. The Blog should not be used as a substitute for competent research advice.