MAPT and Alzheimer disease: Tau pathology is more common in patients diagnosed with nfvPPA (Josephs et al., 2006, Knibb et al., 2006), while markers of amyloid deposition and other indicators of AD pathology are more prevalent in those with lvPPA (Chare et al., 2014, Gil-Navarro et al., 2013, Leyton et al., 2011).