Genetic data for FTD-ALS spectrum mutations was available for 14 patients and resulted in 1 MAPT gene mutation (a bvFTD patient with positive family history for dementia) and 4 C9orf72 repeat expansions (2 bvFTD-ALS both with positive family history for FTD and ALS, 1 bvFTD with no family history for neurodegenerative/psychiatric disease, 1 ALS with positive family history for ALS and FTD). The gene discussed is C9orf72; the disease is frontotemporal dementia.