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JOURNAL ARTICLE
REVIEW
Etiopathogeny, prognosis and therapy of myelodysplastic syndromes.
Hematology and Cell Therapy 1997 December
Myelodysplastic syndromes (MDS) are a heterogeneous and common group of clonal hematological disorders characterized by cytopenias, dysplastic changes of hematopoietic cells, and a high rate of transformation into acute myeloblastic leukemia (AML). MDS provide a clinical model for studying the emergency and progression of malignancy. The initiating events leading to MDS remain almost unknown. Imbalance of proliferative and differentiating capabilities of progenitor hematopoietic cells along with abnormalities in the normal process of apoptosis are involved in both the pathogenesis of MDS and transformation into AML. Multiple genomic lesions, comprising oncogene activation and tumor-suppressor gene inactivation, are probably required. Alkylating agents, cytotoxic drugs targeting topoisomerase II and benzene are the only clear etiological factors identified. Advanced age and great prognostic variability, not explained by the FAB subtype, complicates the design and analysis of clinical trials and therapy-planning. The use of recently developed prognostic scores for selecting the best treatment according to the expected risk is encouraged. In most patients therapy is unsatisfactory. At present, bone marrow transplantation is considered as the only curative approach. A better knowledge of the pathobiology of MDS should be valuable to develop new, more rationale and effective therapies.
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