Cephalon Decitabine, Arsenic Trioxide and Ascorbic Acid for Myelodysplastic Syndrome

Subjects receive decitabine 20 mg/m2 IV over one hour for days1-5 of each cycle, and arsenic trioxide 0.25 mg/kg IV for days 1-5 of cycle 1 followed by 0.25 mg/kg twice weekly (Mon-Thursday or Tues-Fri) for all remaining cycles. Patients will have transfusion and supportive care therapy administered per the treating physician's discretion. Patients with a response after 4 cycles of therapy may choose to continue on two more cycles of decitabine with arsenic and ascorbic acid given only during the first week of those two additional cycles.