Patient will receive 5-azacitidine at a dose of 75 mg/m2 intravenously daily on day 1-5 every 28 days for 6 cycles. Biological correlatives will be performed during this period. Toxicity management is described in section 6.0. The use of growth factor support (either erythropoietin stimulating agents or G-CSF) will be also allowed at discretion of the treating physician.