BCR and acquired polycythemia vera: According to the ICC guidelines, the category of myeloproliferative neoplasms (MPN) include BCR::ABL1-positive chronic myeloid leukemia (CML), essential thrombocythemia (ET), primary myelofibrosis (PMF), and polycythemia vera (PV) as well as chronic neutrophilic leukemia (CNL) and chronic eosinophilic leukemia (CEL).