Our classification GG-P1~5 will be one of the candidates to combine with SCA; 17q partial gain was the best poor survival marker for all and stage 4, MYCN non-amplified patients among the typical chromosome aberrations, including 1p loss and 11q loss, which led us to its usage for the GG-P/GG-W classification. The gene discussed is MYCN; the disease is autosomal dominant cerebellar ataxia.