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A correction has been published: N Engl J Med 2002;346(24):1923.

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Volume 346:645-652 February 28, 2002 Number 9
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Hematologic and Cytogenetic Responses to Imatinib Mesylate in Chronic Myelogenous Leukemia
Hagop Kantarjian, M.D., Charles Sawyers, M.D., Andreas Hochhaus, M.D., Francois Guilhot, M.D., Charles Schiffer, M.D., Carlo Gambacorti-Passerini, M.D., Dietger Niederwieser, M.D., Debra Resta, R.N., Renaud Capdeville, M.D., Ulrike Zoellner, M.Sc., Moshe Talpaz, M.D., Brian Druker, M.D., for the International STI571 CML Study Group

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ABSTRACT

Background Chronic myelogenous leukemia (CML) is caused by the BCR-ABL tyrosine kinase, the product of the Philadelphia chromosome. Imatinib mesylate, formerly STI571, is a selective inhibitor of this kinase.

Methods A total of 532 patients with late–chronic-phase CML in whom previous therapy with interferon alfa had failed were treated with 400 mg of oral imatinib daily. Patients were evaluated for cytogenetic and hematologic responses. Time to progression, survival, and toxic effects were also evaluated.

Results Imatinib induced major cytogenetic responses in 60 percent of the 454 patients with confirmed chronic-phase CML and complete hematologic responses in 95 percent. After a median follow-up of 18 months, CML had not progressed to the accelerated or blast phases in an estimated 89 percent of patients, and 95 percent of the patients were alive. Grade 3 or 4 nonhematologic toxic effects were infrequent, and hematologic toxic effects were manageable. Only 2 percent of patients discontinued treatment because of drug-related adverse events, and no treatment-related deaths occurred.

Conclusions Imatinib induced high rates of cytogenetic and hematologic responses in patients with chronic-phase CML in whom previous interferon therapy had failed.


Source Information

From the M.D. Anderson Cancer Center, Houston (H.K., M.T.); the University of California at Los Angeles, Los Angeles (C Sawyers); Universitätsklinikum Mannheim der Universität Heidelberg, Mannheim, Germany (A.H.); Centre Hospitalier Universitaire de Poitiers, Poitiers, France (F.G.); Wayne State University, Detroit (C Schiffer); San Gerardo Hospital and National Cancer Institute, Milan, Italy (C.G.-P.); University of Leipzig, Leipzig, Germany (D.N.); Novartis Pharmaceuticals, East Hanover, N.J., and Basel, Switzerland (D.R., R.C., U.Z.); and Oregon Health Sciences University, Portland (B.D.).

Address reprint requests to Dr. Kantarjian at the Department of Leukemia, Box 428, M.D. Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030, or at hkantarj{at}mdanderson.org.

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N Engl J Med 2002; 347:446, Aug 8, 2002. Correspondence

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