SNCA and Alzheimer disease: Previously, 4.1% of cognitively impaired inividuals were A+T− and alpha‐synuclein‐positive compared to 11.1% being alpha‐synuclein‐positive and A+T+,17 with other studies estimating alpha‐synuclein seeds in 30% of AD cases49 and post mortem studies, suggesting Lewy body pathology in up to 60%.16, 50