In a longitudinal cohort study, the 10-year survival rate for patients with SCA differed by genotype: 57% (95% CI 47–69) for SCA1, 74% (67–81) for SCA2, 73% (65–82) for SCA3, and 87% (80–94) for SCA6[8]. This evidence concerns the gene ATXN3 and autosomal dominant cerebellar ataxia.