These varieties are chronic myelomonocytic leukemia (CMML); MDS/MPN with neutrophilia (formerly atypical chronic myeloid leukemia or aCML); MDS/MPN with SF3B1 mutation and thrombocytosis (formerly MDS/MPN-RS-T); MDS/MPN not otherwise specified (formerly MDS/MPN-U); and juvenile myelomonocytic leukemia (JMML) [57,58]. This evidence concerns the gene SF3B1 and myelodysplastic syndrome.