C9orf72 and behavioral variant of frontotemporal dementia: In our cohort, C9orf72 HRE was significantly associated to comorbid behavioural variant FTD (bvFTD) [8/55 vs 22/905; 14.5% vs 2.4%; OR 6.8 (95% CI 2.9–16.2); P = 5.3 × 10–7] as determined by the Neary and Rascovsky criteria.