C9orf72 and amyotrophic lateral sclerosis: SOD1-ALS patients had a median survival time of 114 months, while C9orf72-ALS patients had a median survival time of 29 months and matched sporadic ALS patients had a median survival time of 22 months (SOD1-matchedsALS) and 32 months (C9orf72-matchedsALS).