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• W2809543070 abstract "Dementia can result from a number of distinct diseases with differing etiology and pathophysiology. Even within the same disease, there is considerable phenotypic heterogeneity with varying symptoms and disease trajectories. Dementia diagnosis is thus very complex, time-consuming and expensive and can only be made definitively post-mortem with histopathological confirmation. These inherent difficulties combined with the overlap of some symptoms and even neuropathological features, present a challenging problem for research in the field. This has likely hampered progress in epidemiological studies of risk factors and preventative interventions, as well as genetic and biomarker research. Resource limitations in large epidemiologically studies mean that limited diagnostic criteria are often used, which can result in phenotypically heterogeneous disease states being grouped together, potentially resulting in misclassification bias. When biomarkers are identified for etiologically heterogeneous diseases, they will have low specificity for any utility in clinical practice, even if their sensitivity is high. We highlight several challenges in in the field which must be addressed for the success of future genetic and biomarker studies, and may be key to the development of the most effective treatments. As a step towards achieving this goal, defining the dementia as a biological construct based on the presence of specific pathological features, rather than clinical symptoms, will enable more precise predictive models. It has the potential to lead to the discovery of novel genetic variants, as well as the identification of individuals at heightened risk of the disease, even prior to the appearance of clinical symptoms." @default.
• W2809543070 created "2018-06-29" @default.
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• W2809543070 date "2018-06-19" @default.
• W2809543070 modified "2023-10-15" @default.
• W2809543070 title "Phenotypic Heterogeneity in Dementia: A Challenge for Epidemiology and Biomarker Studies" @default.
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• W2809543070 doi "https://doi.org/10.3389/fpubh.2018.00181" @default.
• W2809543070 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6018385" @default.
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