JAK2 and juvenile myelomonocytic leukemia: Other neoplastic myeloid conditions have been associated with monocytic abnormalities including juvenile myelomonocytic leukemia, chronic myeloid leukemia with p190 fusion, and myeloid neoplasm with rearrangements of PDGFRA, PDGFRB, FGFR1 and PCM1-JAK2.