Abstract
We applied RT‐QuIC assay to detect α‐synuclein aggregates in cerebrospinal fluid (CSF) of patients with suspected Creutzfeldt–Jakob disease who had a neuropathological diagnosis of dementia with Lewy bodies (DLB) (n = 7), other neurodegenerative diseases with α‐synuclein mixed pathology (n = 20), or without Lewy‐related pathology (n = 49). The test had a sensitivity of 92.9% and specificity of 95.9% in distinguishing α‐synucleinopathies from non‐α‐synucleinopathies. When performed in the CSF of patients with DLB (n = 36), RT‐QuIC was positive in 17/20 with probable DLB, 0/6 with possible DLB, and 0/10 with Alzheimer disease. These results indicate that RT‐QuIC for α‐synuclein is an accurate test for DLB diagnosis.
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