KIT Kinase Mutants Show Unique Mechanisms of Drug Resistance to Imatinib and Sunitinib in Gastrointestinal Stromal Tumor Patients
KIT kinase mutants show unique mechanisms of drug resistance to imatinib and sunitinib in gastrointestinal stromal tumor patients Ketan S. Gajiwalaa,1, Joe C. Wub,1, James Christensenc, Gayatri D. Deshmukhb, Wade Diehla, Jonathan P. DiNittob, Jessie M. Englishb,2, Michael J. Greiga, You-Ai Hea, Suzanne L. Jacquesb, Elizabeth A. Lunneya,3, Michele McTiguea, David Molinaa,4, Terri Quenzera, Peter A. Wellsd, Xiu Yua, Yan Zhangb, Aihua Zoud, Mark R. Emmette,f, Alan G. Marshalle,f, Hui-Min Zhange,g, and George D. Demetrih,3 aDepartments of Structural and Computational Biology, cCancer Biology, and dBiochemical Pharmacology, Pfizer Global Research and Development, 10777 Science Center Drive, La Jolla, CA 92121; bDepartment of Enzymology and Biochemistry, Pfizer Research Technology Center, 620 Memorial Drive, Cambridge, MA 02139; eNational High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, FL 32310; fDepartment of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306; gInstitute of Molecular Biophysics, Florida State University, Kasha Laboratory, MC4380, Tallahassee, FL 32306; and hLudwig Center at Dana–Farber/Harvard Cancer Center, 44 Binney Street, Boston, MA 02115 Communicated by Joseph Schlessinger, Yale University School of Medicine, New Haven, CT, December 8, 2008 (received for review September 24, 2008) Most gastrointestinal stromal tumors (GISTs) exhibit aberrant ac- T670I. However, certain imatinib-resistant mutants are also resis- tivation of the receptor tyrosine kinase (RTK) KIT. The efficacy of tant to sunitinib, including D816H/V (6), which are located in the the inhibitors imatinib mesylate and sunitinib malate in GIST activation loop (A-loop) of the KIT catalytic domain (Fig.
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