In addition, we found that the expression levels of ERBB2, CCND1 and BCL2 were positively correlated with FA recurrence (ERBB2, P = 0.013; CCND1, P = 0.004; BCL2, P = 0.001) (Supplementary Fig. 9a, Table 1). The gene discussed is BCL2; the disease is Friedreich ataxia.