TOPICS: Myeloid lineage, hyperuricemia, gout, marrow fibrosis, chronic myeloid leukemia, CML, t(9;22), BCR/ABL fusion gene, tyrosine kinase, basophils, leukocyte alkaline phosphatase, LAP, imatinib, polycythemia vera, JAK2 kinase, hyperviscosity, Budd Chiari syndrome, peptic ulcer disease, itching, erythropoietin, SaO2, phlebotomy, hydroxyurea, essential thrombocythemia, aspirin, myelofibrosis, megakaryocytes, leukoerythroblastic smear, ruxolitinib, appropriate absolute polycythemia, inappropriate absolute polycythemia, renal cell carcinoma, hepatocellular carcinoma