C9orf72 and dementia: The number of participants judged to be symptomatic by clinicians was 152: 103 bvFTD7 (27 GRN, 21 MAPT, 55 C9orf72), 24 PPA8 (20 GRN, 1 MAPT, 3 C9orf72), 16 ALS or FTD-ALS24 (all C9orf72), 4 with parkinsonian disorders10 11 (2 GRN, 1 MAPT, 1 C9orf72), and five diagnosed with a dementia not otherwise specified (1 GRN, 1 MAPT, 3 C9orf72).