- Allowed "non-intensive" prior treatments for pre-existing hematologic conditions (i.e., MDS, chronic myelomonocytic leukemia [CMML]) will include: hydroxyurea, thalidomide, hematopoietic growth factors, Zarnestra, Lenalidomide, arsenic, Imatinib, and corticosteroids, suberoylanilide hydroxamic acid [SAHA] inhibitors; hydroxyurea is allowed up to 24 hours before initiating treatment and to control blood counts during the first cycle of chemotherapy after azacitidine has completed; a minimum of 4 weeks must have elapsed since the administration of thalidomide, Zarnestra, Revlimid, arsenic, SAHA inhibitors, or any investigational medication; a minimum of five days must have elapsed since the administration of growth factors