In a recent comprehensive review by Bourinaris and Houlden [23], C9orf72 intermediate repeat lengths were reported in several parkinsonism and movement disorders, including in Dopa-responsive PD, atypical parkinsonisms including PSP and MSA, essential-tremor plus parkinsonism, and spinocerebellar ataxia. This evidence concerns the gene C9orf72 and Parkinson disease.