A myelodysplastic/myeloproliferative neoplasm which is characterized by persistent monocytosis, absence of a philadelphia chromosome and bcr/abl fusion gene, fewer than 20 percent blasts in the bone marrow and blood, myelodysplasia, and absence of pdgfra or pdgfrb rearrangement. [ncit:c3178]

Chronic myelomonocytic leukemia (CMML) is a type of leukemia, which are cancers of the blood-forming cells of the bone marrow. In adults, blood cells are formed in the bone marrow, by a process that is known as haematopoiesis...