GSTM1 and autosomal dominant cerebellar ataxia: Of the 919 NB with abnormal hemoglobin profile, ten (1.09%) presented genotypes that will develop clinical complications; in that, nine NB with SCD (four with SCA – Hb FS and five were double-heterozygous Hb S and Hb C – Hb SC), and one NB homozygous for Hb C (Hb FC).