Recent studies of the BCR-ABL fusion protein, the product of the oncogene responsible for chronic myelogenous leukemia, have identified a number of signal transduction pathways that are activated by this tyrosine kinase. In some cases, these pathways are critical mediators of the growth stimulatory effects of the oncogene on hemopoietic cells. This knowledge has been translated into therapeutic strategies that directly target BCR-ABL or the signaling pathways that BCR-ABL activates. Promising results in animal models have led to the design of Phase I clinical trials, which are in progress or will be under way shortly. These studies are among the first to target a specific genetic abnormality in human cancer.
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