Amonafide is a DNA intercalating agent and inhibitor of topoisomerase II that has been extensively studied in patients with malignant solid tumors. Amonafide has also been studied in patients with AML. In three phase I clinical trials, amonafide demonstrated anti-leukemic activity, both as monotherapy and in combination with cytarabine. This protocol is designed to further assess the safety and efficacy of amonafide in combination with cytarabine in subjects with previously untreated secondary AML.