| Exclusion Criteria: | 1) Part A only: Prior exposure to greater than 3 cycles of azacitidine
2) Part B only: Prior exposure to greater than 3 cycles of decitabine
3) Exposure to a hypomethylating agent within the last 30 days
4) Prior history of leukemia or aplastic anemia
5) Prior history of bone marrow transplantation
6) Prior malignancy (other than in situ cervical cancer, controlled prostate cancer, or basal cell cancer of the skin) unless treated with curative intent and without evidence of disease for greater than or equal to 3 years before randomization
7) Active or uncontrolled infections
8) Unstable angina, congestive heart failure [NYHA > class II], uncontrolled hypertension [diastolic >100 mmHg], uncontrolled cardiac arrhythmia, or recent (within 1 year) myocardial infarction
9) History of arterial thrombosis ( eg, stroke or transient ischemic attack) in the past year
10) History of venous thrombosis and currently requires anti-coagulation therapy
11) Received IL-11 within 4 weeks of screening
12) Less than 4 weeks since receipt of any therapeutic drug or device that is not FDA approved for any indication
13) Have previously received any other thrombopoietic growth factor
14) Subject is pregnant (eg, positive HCG test) or is breast-feeding.
15) Subject of reproductive potential who are not using adequate contraceptive precautions in the judgment of the investigator.
16) Subject has known hypersensitivity to any recombinant E coli-derived product (eg, InfergenŽ, NeupogenŽ, Somatropin, and Actimmune).
17) Subject previously has enrolled in this study
18) Subject will not be available for follow-up assessment.
19) Subject has any kind of disorder that compromises the ability of the subject to give written informed consent (and does not have a legally-acceptable representative) or subject is unable to comply with study procedures |