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PERSPECTIVE
1 Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at University of California at Los Angeles, Los Angeles, California 90095, USA; 2 Department of Microbiology, Immunology and Molecular Genetics and the Howard Hughes Medical Institute, David Geffen School of Medicine at University of California at Los Angeles, Los Angeles, California 90095, USA
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Chronic myeloid leukemia (CML) and a subtype of B-cell acute lymphocytic leukemia (B-ALL) result from the constitutive expression of the Philadelphia (Ph) chromosome, a reciprocal translocation between ABL on chromosome 9 and BCR located on chromosome 22 (Nowell and Hungerford 1960
; Rowley 1973
). The chimeric BCR-ABL fusion product encoded by this chromosomal translocation is a tyrosine kinase, and its activity accounts for >90% of CML cases and up to 15% of B-ALL cases (Deininger et al. 2000
). The treatment of CML has been revolutionized by the development of Imatinib mesylate (Gleevec, STI571), a targeted inhibitor of BCR-ABL
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Genes & Dev. 2007 21: 2283-2287.