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Blood, 15 July 2005, Vol. 106, No. 2, pp. 721-724.
Prepublished online as a Blood First Edition Paper on March 24, 2005; DOI 10.1182/blood-2004-12-4617.


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NEOPLASIA
Brief report

Activation mutations of human c-KIT resistant to imatinib mesylate are sensitive to the tyrosine kinase inhibitor PKC412

Joseph D. Growney, Jennifer J. Clark, Jennifer Adelsperger, Richard Stone, Doriano Fabbro, James D. Griffin, and D. Gary Gilliland

From the Division of Hematology, Department of Medicine, Brigham and Women's Hospital, Boston, MA, the Dana-Farber Cancer Institute, Boston, MA; Novartis Pharma AG, Basel, Switzerland, and the Howard Hughes Medical Institute, Harvard Medical School, Boston, MA.

Constitutively activated forms of the transmembrane receptor tyrosine kinase c-KIT have been associated with systemic mast cell disease, acute myeloid leukemia, and gastrointestinal stromal tumors. Reports of the resistance of the kinase domain mutation D816V to the adenosine triphosphate (ATP)-competitive kinase inhibitor imatinib mesylate prompted us to characterize 14 c-KIT mutations reported in association with human hematologic malignancies for transforming activity in the murine hematopoietic cell line Ba/F3 and for sensitivity to the tyrosine kinase inhibitor PKC412. Ten of 14 c-KIT mutations conferred interleukin 3 (IL-3)-independent growth. c-KIT D816Y and D816V transformed cells were sensitive to PKC412 despite resistance to imatinib mesylate. In these cells, PKC412, but not imatinib mesylate, inhibited autophosphorylation of c-KIT and activation of downstream effectors signal transducer and transcriptional activator 5 (Stat5) and Stat3. Variable sensitivities to PKC412 or imatinib mesylate were observed among other mutants. These findings suggest that PKC412 may be a useful therapeutic agent for c-KIT-positive malignancies harboring the imatinib mesylate-resistant D816V or D816Y activation mutations. (Blood. 2005;106:721-724)


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