One case of MDS-MLD was classified as MDS-SF3B1 in the 2 new classifications because of SF3B1. One MDS/MPN-RS-T case and 1 MDS/MPN-U case were reclassified as MDS/MPN-SF3B1-T because of SF3B1 mutation detected (Table 2, Figure 1). This evidence concerns the gene SF3B1 and metachromatic leukodystrophy.