label: Juvenile Myelomonocytic Leukemia
label_lc: juvenile myelomonocytic leukemia
description: "A clonal myeloid disorder of childhood previously classified as myelodysplastic/myeloproliferative neoplasm. It is characterized by the presence of monocytic proliferation in peripheral blood, less than 20% blasts in bone marrow and peripheral blood, splenomegaly, and the absence of BCR-ABL1 fusion. Almost all patients carry mutations of the RAS pathway."