JOURNAL ARTICLE
REVIEW
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Myelodysplastic/myeloproliferative neoplasms.

The myelodysplastic/myeloproliferative neoplasms (MDS/MPN) include clonal myeloid neoplasms that overlap the MDS and MPN categories and at the time of initial diagnosis exhibit some clinical, laboratory, or morphologic features supporting the diagnosis of myelodysplastic syndrome (MDS) and at the same time show proliferative features in keeping with the diagnosis of a myeloproliferative neoplasm (MPN). Although the clinical, morphologic, and laboratory findings vary along a continuum from MDS to MPN, distinctive features are usually present that allow assignment of most of the cases to 1 of 3 distinct subtypes recognized by the 2008 World Health Organization (WHO) classification: chronic myelomonocytic leukemia (CMML), atypical chronic myeloid leukemia, BCR-ABL(-)(aCML, BCR-ABL1(-)), and juvenile myelomonocytic leukemia (JMML). The WHO classification also recognizes a provisional category of the MDS/MPN, unclassifiable (MDS/MPN, U), including the provisional entity of refractory anemia with ring sideroblasts and thrombocytosis (RARS-T). In the past 2 to 3 years since the publication of the WHO classification in 2008, dynamic progress in array technologies and next-generation amplicon deep sequencing has provided new insights into the molecular pathogenesis of MDS/MPN, especially CMML and JMML. In this review we will give an overview of these neoplasms and focus on adult MDS/MPN, especially CMML. We will give only brief updates for aCML and RARS-T; JMML will be discussed in a separate article.

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