CMML is characterized by sustained monocytosis and an overlap of myeloproliferative neoplasms (MPN) and myelodysplastic syndromes (MDS) resulting from a cumulative mutational landscape including TET2 (60%), SRSF2 (50%), ASXL1 (40%), and the oncogenic RAS pathway (30%) mutations [103]. This evidence concerns the gene ASXL1 and myelodysplastic syndrome.