MAPT and Alzheimer disease: Importantly, strong correlations between early phase amyloid or tau PET and neurodegeneration measures were not restricted to Alzheimer’s disease: patients with frontotemporal dementia (FTD) [22,62], Parkinson’s disease dementia (PDD) [23], Lewy body dementia (LBD) [77], and other non-AD pathologies also showed comparable results.