APP and familial Alzheimer disease: Thus, in order to address the contribution of the autophagy-lysosomal system in different tauopathies, we studied human post-mortem brain tissue from patients with both tau and Aβ pathology [familial AD (FAD) cases with the Swedish double-mutation in the amyloid precursor protein (APPswe)] as well as brain tissue from patients with a primary tauopathies in the absence of significant amyloid pathology (CBD and PSP).