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      The Advisory Group on Risk Evidence Education for Dementia: Multidisciplinary and Open to All

      editorial
      a , b , * , c , a , b , d , d , e , e , f , g , e , h , i , j , a , k , l , m , n , o , p , q , r , s , t , u , a , v , w , x , y , z , aa , members of AGREEDementia
      Journal of Alzheimer's Disease
      IOS Press
      Alzheimer’s disease, amyloid, biomarkers, dementia, genetics

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          Abstract

          The brain changes of Alzheimer’s disease and other degenerative dementias begin long before cognitive dysfunction develops, and in people with subtle cognitive complaints, clinicians often struggle to predict who will develop dementia. The public increasingly sees benefits to accessing dementia risk evidence (DRE) such as biomarkers, predictive algorithms, and genetic information, particularly as this information moves from research to demonstrated usefulness in guiding diagnosis and clinical management. For example, the knowledge that one has high levels of amyloid in the brain may lead one to seek amyloid reducing medications, plan for disability, or engage in health promoting behaviors to fight cognitive decline. Researchers often hesitate to share DRE data, either because they are insufficiently validated or reliable for use in individuals, or there are concerns about assuring responsible use and ensuring adequate understanding of potential problems when one’s biomarker status is known. Concerns include warning people receiving DRE about situations in which they might be compelled to disclose their risk status potentially leading to discrimination or stigma. The Advisory Group on Risk Evidence Education for Dementia (AGREEDementia) welcomes all concerned with how best to share and use DRE. Supporting understanding in clinicians, stakeholders, and people with or at risk for dementia and clearly delineating risks, benefits, and gaps in knowledge is vital. This brief overview describes elements that made this group effective as a model for other health conditions where there is interest in unfettered collaboration to discuss diagnostic uncertainty and the appropriate use and communication of health-related risk information.

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          Hidden in Plain Sight — Reconsidering the Use of Race Correction in Clinical Algorithms

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            Diagnostic value of plasma phosphorylated tau181 in Alzheimer’s disease and frontotemporal lobar degeneration

            With the potential development of new disease-modifying Alzheimer’s Disease (AD) therapies, simple, widely available screening tests are needed to identify which individuals who are experiencing symptoms of cognitive or behavioral decline should be further evaluated for initiation of treatment. A blood-based test for AD would be a less invasive and less expensive screening tool than the currently approved CSF or amyloid β-PET diagnostic tests. We examined whether plasma phosphorylated tau at residue 181 (pTau181) could differentiate between clinically diagnosed or autopsy confirmed AD and Frontotemporal Lobar Degeneration (FTLD). Plasma pTau181 concentrations were increased by 3.5 fold in AD compared to controls and differentiated AD from both clinically diagnosed (Receiver Operating Characteristic Area Under the Curve [AUC]=0.894) and autopsy confirmed FTLD (AUC=0.878). Plasma pTau181 identified amyloid β-PET positive individuals regardless of clinical diagnosis and correlated with cortical tau protein deposition measured by 18F-Flortaucipir PET. Plasma pTau181 may be useful to screen for tau pathology associated with AD.
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              Association of Amyloid Positron Emission Tomography With Subsequent Change in Clinical Management Among Medicare Beneficiaries With Mild Cognitive Impairment or Dementia

              Question Is use of amyloid positron emission tomography (PET) associated with subsequent change in the management of patients with mild cognitive impairment (MCI) or dementia of uncertain etiology? Findings In this longitudinal study that included 11 409 participants with MCI or dementia of uncertain cause, patient management 90 days after amyloid PET changed (compared with the pre-PET plan) in 60.2% of patients with MCI and 63.5% of patients with dementia. Meaning Amyloid PET was associated with changes in the subsequent management of diagnostically challenging patients with cognitive disorders. Importance Amyloid positron emission tomography (PET) detects amyloid plaques in the brain, a core neuropathological feature of Alzheimer disease. Objective To determine if amyloid PET is associated with subsequent changes in the management of patients with mild cognitive impairment (MCI) or dementia of uncertain etiology. Design, Setting, and Participants The Imaging Dementia—Evidence for Amyloid Scanning (IDEAS) study was a single-group, multisite longitudinal study that assessed the association between amyloid PET and subsequent changes in clinical management for Medicare beneficiaries with MCI or dementia. Participants were required to meet published appropriate use criteria stating that etiology of cognitive impairment was unknown, Alzheimer disease was a diagnostic consideration, and knowledge of PET results was expected to change diagnosis and management. A total of 946 dementia specialists at 595 US sites enrolled 16 008 patients between February 2016 and September 2017. Patients were followed up through January 2018. Dementia specialists documented their diagnosis and management plan before PET and again 90 (±30) days after PET. Exposures Participants underwent amyloid PET at 343 imaging centers. Main Outcomes and Measures The primary end point was change in management between the pre- and post-PET visits, as assessed by a composite outcome that included Alzheimer disease drug therapy, other drug therapy, and counseling about safety and future planning. The study was powered to detect a 30% or greater change in the MCI and dementia groups. One of 2 secondary end points is reported: the proportion of changes in diagnosis (from Alzheimer disease to non–Alzheimer disease and vice versa) between pre- and post-PET visits. Results Among 16 008 registered participants, 11 409 (71.3%) completed study procedures and were included in the analysis (median age, 75 years [interquartile range, 71-80]; 50.9% women; 60.5% with MCI). Amyloid PET results were positive in 3817 patients with MCI (55.3%) and 3154 patients with dementia (70.1%). The composite end point changed in 4159 of 6905 patients with MCI (60.2% [95% CI, 59.1%-61.4%]) and 2859 of 4504 patients with dementia (63.5% [95% CI, 62.1%-64.9%]), significantly exceeding the 30% threshold in each group ( P  < .001, 1-sided). The etiologic diagnosis changed from Alzheimer disease to non–Alzheimer disease in 2860 of 11 409 patients (25.1% [95% CI, 24.3%-25.9%]) and from non–Alzheimer disease to Alzheimer disease in 1201 of 11 409 (10.5% [95% CI, 10.0%-11.1%]). Conclusions and Relevance Among Medicare beneficiaries with MCI or dementia of uncertain etiology evaluated by dementia specialists, the use of amyloid PET was associated with changes in clinical management within 90 days. Further research is needed to determine whether amyloid PET is associated with improved clinical outcomes. Trial Registration ClinicalTrials.gov Identifier: NCT02420756 In an attempt to understand if amyloid PET imaging improves the care of patients with MCI or dementia, this cohort study investigates associations between information provided by amyloid PET scan and change in clinical management, defined as a composite of change in drug therapy or counseling about safety and future planning.
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                Author and article information

                Journal
                J Alzheimers Dis
                J Alzheimers Dis
                JAD
                Journal of Alzheimer's Disease
                IOS Press (Nieuwe Hemweg 6B, 1013 BG Amsterdam, The Netherlands )
                1387-2877
                1875-8908
                31 July 2022
                22 November 2022
                2022
                : 90
                : 3
                : 953-962
                Affiliations
                [a ] VA Medical Center-Palo Alto , Palo Alto, CA, USA
                [b ] Stanford University , School of Medicine, Stanford, CA, USA
                [c ] School of Public Health Georgia State University , Atlanta, GA, USA
                [d ] Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
                [e ] University of Wisconsin School of Medicine and Public Health , Madison, WI, USA
                [f ]The Association for Frontotemporal Degeneration, King of Prussia, PA, USA
                [g ] Columbia University Irving Medical Center , New York, NY, USA
                [h ] University of California , Irvine, Irvine, CA, USA
                [i ] Michigan Alzheimer’s Disease Research Center, University of Michigan , Ann Arbor, MI, USA
                [j ] Departments of Epidemiology & Population Health and of Neurology & Neurological Sciences, Stanford University , Stanford, CA, USA
                [k ] University of Pittsburgh , Pittsburgh, PA, USA
                [l ]West Chester East High School, West Chester, PA, USA
                [m ] Center for Imaging of Neurodegenerative Diseases , San Francisco Veterans Affairs Medical Center, San Francisco, CA, USA
                [n ] Federal University of São Paulo - UNIFESP , São Paulo, SP, Brazil
                [o ] Emory Goizueta Alzheimer’s Disease Research Center , Atlanta, GA, USA
                [p ] University of Michigan , Ann Arbor, MI, USA
                [q ] Sharon High School, Sharon, MA, USA
                [r ] Indiana University School of Medicine , Indianapolis, IN, USA
                [s ] Columbia University , New York, NY, USA
                [t ] Department of Neurology, Washington University School of Medicine , Saint Louis, MO, USA
                [u ] Department of Radiology, Mayo Clinic, Rochester, MN, USA
                [v ]Beating Alzheimer’s by Embracing Science, Ramona, CA, USA
                [w ] Alzheimer’s Therapeutic Research Institute/USC , San Diego, CA, USA
                [x ] University of Pennsylvania Perelman School of Medicine , Philadelphia, PA, USA
                [y ] University of Washington , Seattle, WA, USA
                [z ] Virginia Tech, Blacksburg, VA, USA
                [aa ] Rush University Medical Center , Chicago, IL, USA
                Author notes
                [* ]Correspondence to: Allyson C. Rosen, PhD, ABPP-CN, Mental Illness Research, Education and Clinical Center (MIRECC), Palo Alto VA Medical Center, 3801 Miranda Ave (151Y), Palo Alto, CA 94304-1207, USA. Tel.: +1 650 279 3949; E-mail: rosena@ 123456stanford.edu .
                Article
                JAD220458
                10.3233/JAD-220458
                9901285
                35938255
                1db4023c-b5a0-4843-98ac-1493b86218fa
                © 2022 – The authors. Published by IOS Press

                This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial (CC BY-NC 4.0) License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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                Categories
                Editorial

                alzheimer’s disease,amyloid,biomarkers,dementia,genetics
                alzheimer’s disease, amyloid, biomarkers, dementia, genetics

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