Chronic myelomonocytic leukaemia (CMML) is a myelodysplastic syndrome and is characterized dysplastic monocytosis, hypercellular bone marrow, splenomegaly, and progression to acute myelogenous leukemia (AML). A sub-set of CMMLs have a t(5;12)(q33;p13)
balanced translocation involving the PDGFRB and ETV6 (TEL) genes.