The aim of this study is to examine the relationship between plasma putative biomarkers for Alzheimer's disease (i.e. Ab40 amyloid and total Ab42 amyloid, free, bound, free/bound, truncated, sAPPα) and : * the risk of conversion of individuals with Mild Cognitive Impairment (MCI) into Alzheimer's disease (AD), * the Alzheimer's disease progression rate.
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Mean concentration of plasma AB peptides
Timeframe: at t0 and 24 months
plasma levels of Tau protein
Timeframe: t0