GSTM1 and autosomal dominant cerebellar ataxia: The burden of SCA is greatest in sub-Saharan Africa and the highest frequency of the sickle cell allele, approximately 18%, is found in northern Angola.3 However, with increasing migration, SCA can be encountered everywhere in the world.3 In Luanda, the capital of Angola, 36,453 newborns were screened for SCA 2011 to 2013.4 Of these, 77.3% had normal Hb, 21.0% SCT and 1.5% SCA.