MDS/MPN overlap syndromes

From a review in Blood:

Myelodysplastic/myeloproliferative neoplasms (MDS/MPN) comprise a World Health Organization (WHO) category of hematopoietic stem cell malignancies sharing morphologic and hematologic features of both myelodysplastic syndromes and myeloproliferative neoplasms.1 As characterized by the WHO in 2008, these disorders include chronic myelomonocytic leukemia (CMML), juvenile myelomonocytic leukemia (JMML), atypical BCR-ABL1 negative chronic myeloid leukemia (aCML), myelodysplastic/myeloproliferative neoplasm unclassifiable (MDS/MPN-U), and a provisional entity named refractory anemia with ring sideroblasts and thrombocytosis (RARS-T).