Eligibility for enrollment in the study was limited to patients aged 60 to 75 years old with previously untreated de novo AML as defined morphologically by the French-American-British (FAB) classification with the exception of M3 and M7 subtypes.10,11 The bone marrow aspirate had to show at least 30 percent of nonerythroid blast cells. Patients were not eligible if they had a performance status before diagnosis of 2 or more according to the World Health Organization (WHO) grading system, congestive heart failure or abnormal left ventricular ejection fraction, severe hepatic or renal disturbances if not related to leukemia (hepatic enzymes levels over four times the normal values, serum bilirubin over 35 micromol/L, creatinine over 150 micromol/L). Patients with previous unexplained cytopenia were eligible for the study. Conversely, patients with a history of documented myelodysplastic or myeloproliferative syndrome or previously treated with chemotherapy or radiation could not enter the study. The study received in June 1996 approval from the ethics' board of the Nancy Hospital and written informed consent was given by all eligible patients before entering the study, in accordance with the Declaration of Helsinki. The enrollment period was open from November 1996 to April 2000.