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Blood, 15 June 2007, Vol. 109, No. 12, pp. 5143-5150.
Prepublished online as a Blood First Edition Paper on February 22, 2007; DOI 10.1182/blood-2006-11-056028.
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CLINICAL TRIALS AND OBSERVATIONS
Dasatinib or high-dose imatinib for chronic-phase chronic myeloid leukemia after failure of first-line imatinib: a randomized phase 2 trial
Hagop Kantarjian1,
Ricardo Pasquini2,
Nelson Hamerschlak3,
Philippe Rousselot4,
Jerzy Holowiecki5,
Saengsuree Jootar6,
Tadeusz Robak7,
Nina Khoroshko8,
Tamas Masszi9,
Aleksander Skotnicki10,
Andrzej Hellmann11,
Andrey Zaritsky12,
Anatoly Golenkov13,
Jerald Radich14,
Timothy Hughes15,
Athena Countouriotis16, and
Neil Shah17
1 M. D. Anderson Cancer Center, Houston, TX;
2 Hospital De Clinicas De Curitiba, Curitiba, Parana, Brazil;
3 Hospital Israelita Albert Einstein, Sao Paulo, Brazil;
4 Hospital Saint Louis, Paris Cedex, France;
5 Katedra I Klinika Hematologii I Transplantacji Szpiku, Katowice, Poland;
6 Ramathibodi Hospital, Bangkok, Thailand;
7 Szpital Specjalistyczny Im. Kopernika Klinika Hematologii, Lodz, Poland;
8 National Research Hematology Center, Moscow, Russian Federation;
9 National Medical Center, Budapest, Hungary;
10 Collegium Medicum Uniwesytetu Jagiellonskiego, Krakow, Poland;
11 Klinika Hematologii, Akademia Medyczna, Gdansk, Poland;
12 St Petersburg State Medical University, St Petersburg, Russian Federation;
13 Moscow Region Research Clinical Institute, Moscow, Russia;
14 Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA;
15 Division of Hematology, Institute of Medical and Veterinary Science, Adelaide, Australia;
16 Bristol-Myers Squibb, Wallingford, CT;
17 Division of Hematology and Oncology, University College of San Francisco School of Medicine, San Francisco, CA
Therapeutic options for chronic myelogenous leukemia (CML) resistant to 400 to 600 mg imatinib are limited. Escalating imatinib doses may overcome resistance. Dasatinib, a significantly more potent inhibitor of BCR-ABL, is safe and effective in this population. Patients with imatinib-resistant chronic-phase (CP) CML were randomized 2:1 to 140 mg dasatinib (n = 101) or 800 mg imatinib (n = 49). With a median follow up of 15 months, complete hematologic responses were observed in 93% and 82% of patients receiving dasatinib and high-dose imatinib (P = .034), respectively. Dasatinib resulted in higher major cytogenetic response rates (52%) than high-dose imatinib (33%) (P = .023); this included complete cytogenetic response in 40% and 16% (P = .004). Major molecular responses were also more frequent with dasatinib (16% versus 4%; P = 0.038). Treatment failure (hazard ratio [HR], 0.16; P < .001) and progression-free survival (HR, 0.14; P < .001) both favored dasatinib. Superficial edema (42% versus 15%) and fluid retention (45% versus 30%) were more prevalent with imatinib; pleural effusion was more common with dasatinib (17% versus 0%). Grade 3 to 4 nonhematologic toxicity was minimal. Cytopenias were more frequent and severe with dasatinib. Dasatinib represents a safe and effective therapy for CP-CML resistant to conventional imatinib doses with improved cytogenetic and molecular response rates and progression-free survival relative to high-dose imatinib.

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