SNCA and Alzheimer disease: Perra et al. (2021) reported application of α-synuclein RT-QuIC to nasal brushings in 32 probable DLB, five prodromal DLB and six mixed AD/DLB compared with 38 non-α-synuclein neurological disease controls including CJD, AD, PSP, FTD, CBS, and other non-degenerative disorders.