C9orf72 and frontotemporal dementia: To evaluate cerebellar STMN2 missplicing, we used the NanoString PlexSet platform to measure tSTMN2 RNA in 95 FTLD-TDP cases ([29] with no known FTD-causing mutation, 29 with a C9orf72 repeat expansion and 33 with a mutation in progranulin (GRN)) and in 25 cognitively normal controls pathologically-confirmed to have no TDP-43 pathology (see Table 1).