MAPT and Alzheimer disease: The presence of concurrent AD-like pathology, extracellular amyloid-β (Aβ) plaques and intracellular neurofibrillary tau-tangles, are predictive of PDD (Kalaitzakis et al., 2008; Compta et al., 2011) and LBD (Jellinger and Attems, 2008; Gomperts, 2016).