MAPT and frontotemporal dementia: Available FTD biomarkers include neuroimaging biomarkers (MRI, FDG-PET), fluid biomarkers (cerebrospinal fluid [CSF] analysis), and genetic biomarkers consisting of chromosome 9 open reading frame 72 (c9ORF72), microtubule-associated protein tau (MAPT), and progranulin (GRN) genes [4].