In Table 2, the influence of the UGT1A1 promoter polymorphism, stratified into three groups as described by Chaar V et al9 on the total serum bilirubin as well as on the prevalence of gall stones was examined along with the mean LDH, total Hb, HbF% and absolute reticulocyte count in 133 SCA patients. This evidence concerns the gene UGT1A1 and autosomal dominant cerebellar ataxia.