Abstract
Imatinib mesylate is the sole BCR–ABL tyrosine kinase inhibitor approved as first-line treatment of accelerated-phase (AP) chronic myeloid leukemia (CML). Indication was based on the STI571 0109 study, in which imatinib favorably compared to historical treatments in patients failing prior therapies. The relevance of these results to currently newly diagnosed AP-CML patients remains unknown. We evaluated the benefit of imatinib in 42 newly diagnosed AP-CML patients. In all, 16 patients had hematological acceleration without chromosomal abnormalities in addition to the Philadelphia chromosome (ACAs; HEM-AP), 16 solely had ACAs (ACA-AP) and 10 had hematological acceleration plus ACAs (HEM-AP+ACA). Major cytogenetic responses were achieved in 93.7% of HEM-AP patients, 75% of patients with ACA-AP (P=NS) and 40% of patients with HEM-AP+ACA (P=0.0053). The 24-month failure-free survival rate was 87.5% in HEM-AP patients, 43.8% in ACA-AP patients and 15% in HEM-AP+ACA patients (P=0.022). The 24-month estimate of progression-free survival was 100% in HEM-AP patients, 92.8% in ACA-AP patients and 58.3% in HEM-AP+ACA patients (P=0.0052). In conclusion, frontline imatinib allows favorable outcomes in HEM-AP and ACA-AP patients but appears insufficient for patients with HEM-AP+ACA. Broader-target and/or more potent BCR–ABL tyrosine kinase inhibitors alone or in combination may be considered in this setting.
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Acknowledgements
We wish to thank Dr Joelle Guilhot, Center d’Investigation Clinique, CHU Poitiers, France for helpful advice for statistical analysis. We thank clinical research associates for assistance with data collection: Mrs Fabienne Treilhou, Service des Maladies du Sang, Hôpital Saint-Louis, Paris, France; Mrs Marie-Pierre Fort, Service d’Oncologie Médicale, Institut Bergonié, Bordeaux, France; Mrs Madeleine Etienne, Service d’Hématologie Clinique, Hôpital Edouard Herriot, Lyon, France; Mrs Nadine Cadoux, Service d’Hématologie, CH de la region Annécienne, Pringy, France; and Mr Francis Daniel, Service d’Hématologie, Hôpital Purpan, Toulouse, France. The contribution of biologists from hematology and cytogenetics laboratories of participating centers, especially Dr Odile Maarek, Laboratoire Central d’Hématologie, Hôpital Saint-Louis, Paris, France, is gratefully acknowledged.
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Rea, D., Etienne, G., Nicolini, F. et al. First-line imatinib mesylate in patients with newly diagnosed accelerated phase-chronic myeloid leukemia. Leukemia 26, 2254–2259 (2012). https://doi.org/10.1038/leu.2012.92
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DOI: https://doi.org/10.1038/leu.2012.92
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