MAPT and primary progressive aphasia: On assessment of their specific subtype, the C9orf72 mutation carrier had a diagnosis of nfvPPA, the MAPT mutation carrier had a diagnosis of svPPA, and the GRN mutation carriers split into eight with a diagnosis of nfvPPA (termed GRN-NFV from here) and nine who did not fit diagnostic criteria for any specific PPA variant, i.e. PPA-NOS (termed GRN-NOS from here).