C, cytarabine; D, daunomycin; HDAC, high dose cytarabine; FLAG, fludarabine, cytarabine and granulocyte-stimulating factor; 7+3, idarubicin (3 days) + cytarabine (7 days); EMA, Mitoxantrone, Cytarabine Etoposide; E, etoposide.