Additional Study Information: The purpose of the study is to evaluate the safety, tolerability (the effect of the drug on your body), pharmacokinetics (the effect of your body on the drug) and maximum tolerated dose of sertraline in combination with cytosine arabinoside (ara-C, cytarabine) when given to patients with treatment-resistant myeloid leukemia. In addition, the effect of the drug on your cancer and so-called biomarkers (markers of biological activities in your body), will be determined in blood and bone marrow. Another purpose of the study is what effects (both good and bad) it has on you and your cancer.