Myeloproliferative disorders （MPD） are clonal haematopoietic stem cell disorders characterized by proliferation of one or more myeloid cell lineages in the bone marrow and increased numbers of mature and immature ce...Myeloproliferative disorders （MPD） are clonal haematopoietic stem cell disorders characterized by proliferation of one or more myeloid cell lineages in the bone marrow and increased numbers of mature and immature cells in the peripheral blood. MPDs are classified into five categories： polycythemia vera （PV）, essential thrombocythaemia （ET）, idiopathic myelofibrosis （IMF）, chronic myelogenous leukaemia （CML） and atypical MPD. The atypical MPD includes chronic myelomonocytic leukaemia, juvenile myelomonocytic leukaemia, chronic neutrophilic leukaemia, chronic eosinophilic leukaemia, chronic basophilic leukaemia, hypereosinophilic syndrome, systemic mastocytosis, atypical CML and unclassifiable cases.1-3 Apart from the Philadelphia chromosome and BCR-ABL fusion gene as the characteristic genetic abnormality of CML, the molecular pathogenesis of most MPDs such as PV, ET and IMF has not been described. Nonspecific cytogenetic abnormalities were found at diagnosis in numerous patients including deletions of the long arms of chromosome 20 and chromosome 13,展开更多
文摘Myeloproliferative disorders （MPD） are clonal haematopoietic stem cell disorders characterized by proliferation of one or more myeloid cell lineages in the bone marrow and increased numbers of mature and immature cells in the peripheral blood. MPDs are classified into five categories： polycythemia vera （PV）, essential thrombocythaemia （ET）, idiopathic myelofibrosis （IMF）, chronic myelogenous leukaemia （CML） and atypical MPD. The atypical MPD includes chronic myelomonocytic leukaemia, juvenile myelomonocytic leukaemia, chronic neutrophilic leukaemia, chronic eosinophilic leukaemia, chronic basophilic leukaemia, hypereosinophilic syndrome, systemic mastocytosis, atypical CML and unclassifiable cases.1-3 Apart from the Philadelphia chromosome and BCR-ABL fusion gene as the characteristic genetic abnormality of CML, the molecular pathogenesis of most MPDs such as PV, ET and IMF has not been described. Nonspecific cytogenetic abnormalities were found at diagnosis in numerous patients including deletions of the long arms of chromosome 20 and chromosome 13,
