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Blood, 21 May 2009, Vol. 113, No. 21, pp. 5090-5093. Prepublished online as a Blood First Edition Paper on March 16, 2009; DOI 10.1182/blood-2008-12-194704.
CLINICAL TRIALS AND OBSERVATIONS The favorable impact of CEBPA mutations in patients with acute myeloid leukemia is only observed in the absence of associated cytogenetic abnormalities and FLT3 internal duplication1 Department of Hematology, Hôpital Claude Huriez, Lille; 2 Department of Hematology, Hôpital Saint-Louis, Assistance Publique-Hôpitaux de Paris (AP-HP) and EA3518 University Paris 7, Paris; 3 Department of Hematology, Centre Hospitalier Universitaire (CHU) Dupuytren, Limoges; 4 Department of Hematology, CHU, Caen; 5 Department of Hematology, Centre Henri Becquerel, Rouen; 6 Department of Hematology, Institut Gustave Roussy, Villejuif; 7 Department of Hematology, Hôpital Henri Mondor, AP-HP, Créteil; 8 Department of Hematology, Hôpital Edouard Herriot, Lyon; 9 Department of Hematology, Hôpital Avicenne, AP-HP, Bobigny; and 10 Department of Hematology, Hôpital Mignot, Versailles, France
Mutations of the CCAAT/enhancer binding protein alpha (CEBPA) gene have been associated with a favorable outcome in patients with acute myeloid leukemia (AML), but mainly in those with a normal karyotype. Here, we analyzed the impact of associated cytogenetic abnormalities or bad-prognosis fms-like tyrosine kinase 3 internal tandem duplication (FLT3-ITD) in 53 patients with CEBPA+ de novo AML treated in the Acute Leukemia French Association trials. We found that only those with a normal karyotype and no FLT3-ITD displayed the expected favorable outcome. In this context, relapse-free, disease-free, and overall survival were significantly longer than in corresponding patients without the CEBPA mutation (P = .035, .016, and .047, respectively). This was not observed in the context of an abnormal karyotype or associated FLT3-ITD. Furthermore, after adjustment on age, trial, and mutation type, these features were independently predictive of shorter overall survival in the subset of patients with CEBPA+ AML (multivariate hazard ratio = 2.7; 95% confidence interval, 1.08-6.7; and 2.9; 95% confidence interval, 1.01-8.2; with P = .034 and .05, for abnormal karyotype and FLT3-ITD, respectively).
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