MAPT and memory impairment: Although amnestic deficits in FTD can be affected by executive dysfunction,32 our observations are in line with previous reports, including Mahoney and coworkers and Simon‐Sanchez and coworkers, who reported about half of FTLD‐C9ORF72 patients presented with memory impairment.33, 34 Our previous study showed FTLD‐C9ORF72 had greater tau pathology than FTLD‐GRN.