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  • Title: Diagnosing prodromal Alzheimer's disease: role of CSF biochemical markers.
    Author: Parnetti L, Lanari A, Silvestrelli G, Saggese E, Reboldi P.
    Journal: Mech Ageing Dev; 2006 Feb; 127(2):129-32. PubMed ID: 16274728.
    Abstract:
    Mild cognitive impairment (MCI) is an aetiologically heterogeneous syndrome. A correct prediction of MCI conversion to Alzheimer's disease (AD) represents a primary goal in routine clinical practice. Since the presence of pathological levels in >or=2 cerebrospinal fluid (CSF) biomarkers; amyloid protein (Abeta42), total tau (h-tau) and phospho-tau (p-tau) seems to reliably identifying MCI subjects converting to AD, we report our experience in a routine clinical setting. In the period from January 2001 to June 2003, 273 consecutive patients referred to our Memory Clinic for diagnostic assessment of cognitive impairment. Of them, 180 underwent a complete diagnostic evaluation including CSF dosage of fragment 1-42 of amyloid protein, total tau and phospho-tau (ELISA Method, Innogenetics, Gent, Belgium), after vascular or other secondary causes of dementia could be excluded. At baseline, 38% of the MCI subjects (20/55) showed pathological levels in >or=2 CSF biomarkers. After 1 year, 11 MCI patients converted to dementia, 33 remained stable, 11 showed a further progression of cognitive impairment still not fulfilling the diagnostic criteria for dementia. Of the 11 converters, 10 showed >or=2 pathological values CSF biomarkers and in all of them, p-tau was high. On the contrary, 29 out of 33 stable MCI (88%) showed no or one pathological CSF value. We confirm that pathological levels in >or=2 CSF biomarkers reliably predict MCI conversion to AD and correctly identify the stable form of MCI.
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