Molecular Pathogenesis of Myelodysplastic Syndromes

  • Jesalyn J. Taylor
  • Chung-Che “Jeff” Chang
Part of the Molecular Pathology Library book series (MPLB, volume 4)


Myelodysplastic syndromes (MDSs) are a collection of clonal stem cell hematopoietic disorders that are characterized by ineffective hematopoiesis, multilineage dysplasia, peripheral cytopenias, and susceptibility to leukemic transformation. The complexity of the biologic, clinical, morphologic, and genetic features of MDSs has led to evolving classification systems, including the French–American–British (FAB) classification, which was introduced in 1982, and the subsequent World Health Organization (WHO) classification (1999), which was most recently updated in 2008. Although some of the revisions to the FAB classification remain controversial, the WHO recommendations for MDS classification continue to gain increasing acceptance. Table 33.1 presents the current 2008 WHO classification and criteria for MDSs along with the corresponding FAB designations. Common presenting symptoms include fatigue, infection, pallor, bruising, and/or bleeding; however, patients may also be asymptomatic at diagnosis. Adverse outcomes arising from MDSs include bleeding, anemia, infection, and progression to acute myeloid leukemia (AML), which is often refractory to standard treatments.


Acute Myeloid Leukemia International Prognostic Scoring System Leukemic Transformation Ineffective Hematopoiesis Congenital Dyserythropoietic Anemia 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Jesalyn J. Taylor
    • 1
  • Chung-Che “Jeff” Chang
    • 2
    • 3
  1. 1.Department of PathologyThe Methodist Hospital and The Methodist Research InstituteHoustonUSA
  2. 2.The Methodist HospitalHoustonUSA
  3. 3.Department of PathologyWeill Medical College of Cornell UniversityNew YorkUSA

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