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Medline ® Abstract for Reference 42

of 'Treatment of relapsed or refractory acute myeloid leukemia'

Prognostic impact, concurrent genetic mutations, and gene expression features of AML with CEBPA mutations in a cohort of 1182 cytogenetically normal AML patients: further evidence for CEBPA double mutant AML as a distinctive disease entity.
Taskesen E, Bullinger L, Corbacioglu A, Sanders MA, Erpelinck CA, Wouters BJ, van der Poel-van de Luytgaarde SC, Damm F, Krauter J, Ganser A, Schlenk RF, Löwenberg B, Delwel R, Döhner H, Valk PJ, Döhner K
Blood. 2011;117(8):2469.
We evaluated concurrent gene mutations, clinical outcome, and gene expression signatures of CCAAT/enhancer binding protein alpha (CEBPA) double mutations (CEBPA(dm)) versus single mutations (CEBPA(sm)) in 1182 cytogenetically normal acute myeloid leukemia (AML) patients (16-60 years of age). We identified 151 (12.8%) patients with CEBPA mutations (91 CEBPA(dm) and 60 CEBPA(sm)). The incidence of germline mutations was 7% (5 of 71), including 3 C-terminal mutations. CEBPA(dm) patients had a lower frequency of concurrent mutations than CEBPA(sm) patients (P<.0001). Both, groups were associated with a favorable outcome compared with CEBPA(wt) (5-year overall survival [OS]63% and 56% vs 39%; P<.0001 and P = .05, respectively). However, in multivariable analysis only CEBPA(dm) was a prognostic factor for favorable OS outcome (hazard ratio [HR]0.36, P<.0001; event-free survival, HR 0.41, P<.0001; relapse-free survival, HR 0.55, P = .001). Outcome in CEBPA(sm) is dominated by concurrent NPM1 and/or FLT3 internal tandem duplication mutations. Unsupervised and supervised GEP analyses showed that CEBPA(dm) AML (n = 42), but not CEBPA(sm) AML (n = 18), expressed a unique gene signature. A 25-probe set prediction signature for CEBPA(dm) AML showed 100% sensitivity and specificity. Based on these findings, we propose that CEBPA(dm) should be clearly defined from CEBPA(sm) AML and considered as a separate entity in the classification of AML.
Department of Hematology, Erasmus University Medical Center, Rotterdam, The Netherlands.