C9orf72 and amyotrophic lateral sclerosis: The result of our multivariate analysis, showing a shorter survival time in men carrying the C9orf72 expansion, resembles what recently revealed in a combined analysis of the prognostic characteristics of the C9orf72 repeat expansion, performed in 4925 ALS cases from Dutch, Irish, and Italian population-based national registers and from two (Belgian and UK) clinical research center cohorts (Rooney et al., 2017).