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Prevalence of amyloid-β pathology in distinct variants of primary progressive aphasia.

A new interesting article has been published in Ann Neurol. 2018 Sep 26. doi: 10.1002/ana.25333. and titled:

Prevalence of amyloid-β pathology in distinct variants of primary progressive aphasia.

Authors of this article are:
Bergeron D Gorno-Tempini ML Rabinovici GD Santos-Santos MA Seeley W Miller BL Pijnenburg Y Keulen MA Groot C van Berckel BNM van der Flier WM Scheltens P Rohrer JD Warren JD Schott JM Fox NC Sanchez-Valle R Grau-Rivera O Gelpi E Seelaar H0 Papma JM0 van Swieten JC0 Hodges JR Leyton CE Piguet O Rogalsky EJ Mesulam MM Koric L Nora K Pariente J Dickerson B Mackenzie IR Hsiung GR Belliard S Irwin DJ0 Wolk DA Grossman M Jones M Harris J Mann D Snowden JS Chrem-Mendez P Calandri IL Amengual AA Miguet-Alfonsi C Magnin E Magnani G Santangelo R Deramecourt V Pasquier F Mattsson N0 Nilsson C0 Hansson O0 Keith J Masellis M Black SE Matías-Guiu JA Cabrera-Martin MN Paquet C Dumuirger J Teichmann M Sarazin M0 Bottlaender M0 Dubois B Rowe CC Villemagne VL Vandenberghe R Granadillo E Teng E Mendez M Meyer PT Frings L Lleó A0 Blesa R0 Fortea J0 Seo SW Diehl-Schmid J Grimmer T Frederiksen KS Sánchez-Juan P Chételat G Jansen W Bouchard RW Robert L Jr0 Visser PJ Ossenkoppele R0.

A summary of the article is shown below:
OBJECTIVE: To estimate the prevalence of amyloid-positivity, defined by PET/CSF biomarkers and/or neuropathological examination, in primary progressive aphasia (PPA) variants.METHODS: We conducted a meta-analysis with individual participant data from 1,251 patients diagnosed with PPA (including logopenic [lvPPA, n=443], non-fluent [nfvPPA, n=333], semantic [svPPA, n=401] and mixed/unclassifiable [PPA-M/U, n=74] variants of PPA) from 36 centers, with a measure of amyloid-β pathology (CSF [n=600]), PET [n=366] and/or autopsy [n=378]) available. The estimated prevalence of amyloid-positivity according to PPA variant, age and apolipoprotein E (APOE) ε4 status was determined using generalized estimating equation models.RESULTS: Amyloid-β positivity was more prevalent in lvPPA (86%) than in nfvPPA (20%) or svPPA (16%) (p<0.001). Prevalence of amyloid-β positivity increased with age in nfvPPA (from 10% at age 50 to 27% at age 80, p<0.01) and svPPA (from 6% at age 50 to 32% at age 80, p<0.001), but not in lvPPA (p=0.94). Across PPA variants, APOE ε4 carriers were more often amyloid-β positive (58.0%) than non-carriers (35.0%, p<0.001). Autopsy data revealed Alzheimer's disease (AD) pathology as the most common pathologic diagnosis in lvPPA (76%), frontotemporal lobar degeneration - TDP-43 in svPPA (80%) and frontotemporal lobar degeneration-TDP-43/tau in nfvPPA (64%).INTERPRETATION: This study shows that the current PPA classification system helps to predict underlying pathology across different cohorts and clinical settings, and suggests that age and APOE genotype should be taken into account when interpreting Aβ biomarkers in PPA patients. This article is protected by copyright. All rights reserved.This article is protected by copyright. All rights reserved.
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