Validation of Alzheimer’s disease CSF and plasma biological markers: The multicentre reliability study of the pilot European Alzheimer’s Disease Neuroimaging Initiative (E-ADNI)

• Published in: Experimental gerontology 2009-09, Vol.44 (9), p.579-585
• Main Authors: Buerger, Katharina, Frisoni, Giovanni, Uspenskaya, Olga, Ewers, Michael, Zetterberg, Henrik, Geroldi, Cristina, Binetti, Giuliano, Johannsen, Peter, Rossini, Paolo Maria, Wahlund, Lars-Olof, Vellas, Bruno, Blennow, Kaj, Hampel, Harald
• Format: Article
• Language: English
• Subjects: Adult; Aged; Aged, 80 and over; Alzheimer Disease - diagnosis; Alzheimer’s disease (AD); Alzheimer’s Disease Neuroimaging Initiative (ADNI); Amyloid beta-Peptides - blood; Amyloid beta-Peptides - cerebrospinal fluid; Apolipoproteins E - blood; Apolipoproteins E - cerebrospinal fluid; Biological marker; Biomarkers - blood; Biomarkers - cerebrospinal fluid; Feasibility Studies; Female; Humans; Male; Medicin och hälsovetenskap; Middle Aged; Mild cognitive impairment (MCI); Peptide Fragments - blood; Peptide Fragments - cerebrospinal fluid; Pilot Projects; Positron-Emission Tomography - methods; Psychiatry; Psykiatri; Reproducibility of Results; tau Proteins - blood; tau Proteins - cerebrospinal fluid; Validation
• ISSN: 0531-5565; 1873-6815; 1873-6815
• DOI: 10.1016/j.exger.2009.06.003

Alzheimer’s Disease Neuroimaging Initiatives (“ADNI”) aim to validate neuroimaging and biochemical markers of Alzheimer’s disease (AD). Data of the pilot European-ADNI (E-ADNI) biological marker programme of cerebrospinal fluid (CSF) and plasma candidate biomarkers are reported. Six academic EADC centres recruited 49 subjects (healthy controls, subjects with mild cognitive impairment (MCI) and AD). We measured CSF β-amyloid 42 (CSF Aβ42), total tau-protein (t-tau), phosphorylated tau-proteins (P-tau181, P-tau231), plasma β-amyloid 40 and 42 (Aβ40/Aβ42). Immediate fresh shipment was compared to freezing and later shipment on dry ice. CSF T-tau (fresh samples) was increased in AD versus controls ( p = 0.049), CSF Aβ42 (frozen samples) was decreased in MCI and AD ( p = 0.02), as well as plasma Aβ40 (fresh and frozen samples) in AD ( p = 0.049 and p = 0.016). Pooled values of neurochemical parameters and ratios thereof were different between centres ( p < 0.005). Analysis of frozen samples yielded higher diagnostic accuracy than immediate fresh shipment with 100% (fresh: 100%) correctly classified in control subjects, 100% (78%) in MCI, 91% (91%) in AD. The use of frozen rather than fresh samples renders higher diagnostic accuracy within a multicentre context. We confirmed the feasibility of a multicentre AD biomarker programme for future clinical trials.