PDGFRB and chronic myelogenous leukemia, BCR-ABL1 positive: The pathologic diagnoses of PDGFRB associated mutations have included chronic myelomonocytic leukemia (CMML), chronic eosinophilic leukemia (CEL), atypical CML, myelodysplastic syndrome (MDS), and acute myeloid leukemia (AML) [5].