Treatment arms. Event-free survival (A) and overall survival (B) of patients on remission induction therapy (control group) versus clofarabine therapy group are shown. Patients were randomized for their first (I) and second (II) induction cycles of combination chemotherapy without additional clofarabine (control arm) or with clofarabine at 10 mg/m² on days 1 to 5 of each of both cycles (clofarabine treatment). Clofa, clofarabine.