1. A + T ± status across MCI and dementia due to AD: a clinic-based, retrospective study
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Federico Verde, Edoardo Nicolò Aiello, Ilaria Milone, Eleonora Giacopuzzi Grigoli, Antonella Dubini, Antonia Ratti, Barbara Poletti, Nicola Ticozzi, Vincenzo Silani, Verde, F, Aiello, E, Milone, I, Grigoli Giacopuzzi, E, Dubini, A, Ratti, A, Poletti, B, Ticozzi, N, and Silani, V
- Subjects
Amyloid ,Amyloid beta-Peptides ,Mild cognitive impairment ,tau Proteins ,Dermatology ,General Medicine ,Peptide Fragments ,Psychiatry and Mental health ,Cerebrospinal fluid ,Alzheimer Disease ,Disease Progression ,Humans ,Cognitive Dysfunction ,Neurology (clinical) ,Tau ,Alzheimer’s disease ,Biomarkers ,Retrospective Studies - Abstract
Background: This study aimed at comparing, within the 2018 NIA-AA amyloidosis/tauopathy/neurodegeneration (ATN) framework, the distribution of T ± profiles across A + patients with MCI and dementia in a retrospective, single-center, clinic-based cohort. Methods: We retrospectively collected data on N = 168 A + patients with either MCI due to AD (N = 50) or probable AD dementia (ADD; N = 118). ATN status was assigned, according to the 2018 NIA-AA framework, based on cerebrospinal fluid (CSF) biomarker concentrations. A χ2-test for independent samples was run to compare the distribution of A + T + vs. A + T- profiles, regardless of N status, across MCI and dementia patients. Results: The most represented ATN profile in both groups was A + T + N + (MCI: 54%; dementia: 70.3%); 3.4% of dementia patients and none within the MCI cohort presented with an A + T-N + profile. When grouping ATN profiles solely based on A and T dimensions, the prevalence of A + T + was of 76.3% and 66% in dementia and MCI patients, respectively. No association between clinical diagnoses (i.e., MCI vs. dementia status) and AT profiles (i.e., A + T + vs. A + T-) was detected. Discussion: The distribution of A + T + vs. A + T- does not differ between MCI and ADD, with A + T + profiles being predominant in both clinical categories. This does not support the common notion of A + T- profiles being relatively more prevalent in MCI patients, as indexing an earlier and/or less severe disease. Hence, caution should be exerted in attributing a case of MCI to prodromal AD solely based on A-positivity in the presence of a T-negative profile.
- Published
- 2022
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