Abstract
The hallmark of acute lymphoblastic leukemia (ALL) is a progressive appearance of malignant cell behavior that is triggered by the evolution of altered gene function. ALL has traditionally been viewed as a genetic disease, however, epigenetic defects also play an important role. DNA promoter methylation has gained increasing recognition as an important mechanism for transcriptional silencing of cancer related genes. The hypermethylation-associated inactivation affects virtually all of the pathways in the ALL cellular network, such as the cell cycle, apoptosis and adhesion. The identification of these methylation abnormalities and elucidation of the mechanistic events surrounding them are of prime importance, as the methylation status of ALL cells can be used as prognostic biomarker and also can be manipulated in vivo with demethylating agents.
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