Abstract
Chronic myeloid leukemia is one of the most thoroughly studied and, undoubtedly, best understood neoplasms. There are about 4000 and 5000 new cases of CML every year in the USA. CML is a hematologic stem cell malignancy that typically evolves in 3 distinct clinical stages: chronic and accelerated phases and blast crisis. The chronic phase lasts several years and is characterized by accumulation of myeloid precursors and mature cells in bone marrow, peripheral blood, and extramedullary sites. The accelerated phase lasts 4 to 6 months and is characterized by an increase in disease burden and in the frequency of progenitor/precursor cells. The blast crisis lasts a few months and is the terminal phase of chronic myelogenous leukemia, characterized by the rapid expansion of a population of myeloid or lymphoid differentiation-arrested blast cells (Calabretta and Perrotti 2004; Radich 2007).
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