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Medline ® Abstract for Reference 24

of 'Treatment of chronic myeloid leukemia in chronic phase after failure of initial therapy'

Dasatinib or high-dose imatinib for chronic-phase chronic myeloid leukemia after failure of first-line imatinib: a randomized phase 2 trial.
Kantarjian H, Pasquini R, Hamerschlak N, Rousselot P, Holowiecki J, Jootar S, Robak T, Khoroshko N, Masszi T, Skotnicki A, Hellmann A, Zaritsky A, Golenkov A, Radich J, Hughes T, Countouriotis A, Shah N
Blood. 2007;109(12):5143. Epub 2007 Feb 22.
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 toxicitywas 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.
Department of Leukemia, University of Texas M. D. Anderson Cancer Center, Houston, TX 77230-1402, USA. hkantarj@mdanderson.org