ERFE and autosomal dominant cerebellar ataxia: However, serum ERFE (p < 0.001), ferroportin (p = 0.002), ferritin (p < 0.001), serum iron (p = 0.014), sTFR (p = 0.001), transferrin (p < 0.001), MCV (p = 0.014), TWBC (p < 0.001), and platelet (p < 0.001) were relatively reduced in the SCA patients on hydroxyurea therapy than those who had not received hydroxyurea (Table 3).