Myeloproliferative Neoplasm, BCR-ABL1 Negative

**Semantic type:** Neoplastic Process

**Definition:** 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.

**Synonyms:** - BCR-ABL1 Negative Myeloproliferative Neoplasm - BCR::ABL1 Negative Myeloproliferative Neoplasm - Myeloproliferative Neoplasm, BCR::ABL1 Negative