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Original Article
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Volume 354:2531-2541 June 15, 2006 Number 24
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Dasatinib in Imatinib-Resistant Philadelphia Chromosome–Positive Leukemias
Moshe Talpaz, M.D., Neil P. Shah, M.D., Ph.D., Hagop Kantarjian, M.D., Nicholas Donato, Ph.D., John Nicoll, B.A., Ron Paquette, M.D., Jorge Cortes, M.D., Susan O'Brien, M.D., Claude Nicaise, M.D., Eric Bleickardt, M.D., M. Anne Blackwood-Chirchir, M.D., Vishwanath Iyer, M.S., Tai-Tsang Chen, M.Phil., Fei Huang, Ph.D., Arthur P. Decillis, M.D., and Charles L. Sawyers, M.D.

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ABSTRACT

Background The BCR-ABL tyrosine kinase inhibitor imatinib is effective in Philadelphia chromosome–positive (Ph-positive) leukemias, but relapse occurs, mainly as a result of the outgrowth of leukemic subclones with imatinib-resistant BCR-ABL mutations. We evaluated dasatinib, a BCR-ABL inhibitor that targets most imatinib-resistant BCR-ABL mutations, in patients with chronic myelogenous leukemia (CML) or Ph-positive acute lymphoblastic leukemia (ALL).

Methods Patients with various phases of CML or with Ph-positive ALL who could not tolerate or were resistant to imatinib were enrolled in a phase 1 dose-escalation study. Dasatinib (15 to 240 mg per day) was administered orally in four-week treatment cycles, once or twice daily.

Results A complete hematologic response was achieved in 37 of 40 patients with chronic-phase CML, and major hematologic responses were seen in 31 of 44 patients with accelerated-phase CML, CML with blast crisis, or Ph-positive ALL. In these two phases, the rates of major cytogenetic response were 45 percent and 25 percent, respectively. Responses were maintained in 95 percent of patients with chronic-phase disease and in 82 percent of patients with accelerated-phase disease, with a median follow-up more than 12 months and 5 months, respectively. Nearly all patients with lymphoid blast crisis and Ph-positive ALL had a relapse within six months. Responses occurred among all BCR-ABL genotypes, with the exception of the T315I mutation, which confers resistance to both dasatinib and imatinib in vitro. Myelosuppression was common but not dose-limiting.

Conclusions Dasatinib induces hematologic and cytogenetic responses in patients with CML or Ph-positive ALL who cannot tolerate or are resistant to imatinib. (ClinicalTrials.gov number, NCT00064233 [ClinicalTrials.gov] .)


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From the Departments of Leukemia (M.T., H.K., J.C., S.O.) and Experimental Therapeutics (M.T., N.D.), M.D. Anderson Cancer Center, Houston; Jonsson Comprehensive Cancer Center, University of California at Los Angeles, Los Angeles (N.P.S., J.N., R.P., C.L.S.); Bristol-Myers Squibb, Wallingford, Conn. (C.N., E.B., V.I., T.-T.C., A.P.D.), and Lawrenceville, N.J. (M.A.B.-C., F.H.); and Howard Hughes Medical Institute, Chevy Chase, Md. (C.L.S.).

Drs. Talpaz and Sawyers contributed equally to this article.

Address reprint requests to Dr. Sawyers at Jonsson Comprehensive Cancer Center, University of California at Los Angeles, 11-934 Factor Bldg., 10833 LeConte Ave., Los Angeles, CA 90095, or at csawyers{at}mednet.ucla.edu.

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Related Letters:

Dasatinib in Chronic Myelogenous Leukemia
Kathula S. K., Chu S.-C., Tang J.-L., Li C.-C., Sawyers C. L., Talpaz M., Bleickardt E.
Extract | Full Text | PDF  
N Engl J Med 2006; 355:1062-1064, Sep 7, 2006. Correspondence

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