label: Myeloproliferative Neoplasm, BCR-ABL1 Negative
label_lc: myeloproliferative neoplasm, bcr-abl1 negative
description: A myeloproliferative neoplasm characterized by the absence of Philadelphia chromosome and BCR-ABL1 fusion gene expression. This group includes polycythemia vera, essential thrombocythemia, and primary myelofibrosis.