| Inclusion Criteria: | 1) Must be >/= 18 years of age at the time of voluntarily signing an Institutional Review Board/Independent Ethics Committee (IRB/IEC) – approved informed consent form.
2) Must be diagnosed with myelofibrosis requiring therapy including myelofibrosis with myeloid metaplasia (MMM), de novo presentation (i.e. agnogenic myeloid metaplasia [AMMM], and developing after an antecedent history of Polycythemia vera (i.e., post-polycythemic myeloid metaplasia [PPMM]), or essential Polycythemia (i.e., post thrombocythemic myeloid metaplasia [PTMM]).
3) Screening total hemoglobin level < 10 g/dL or transfusion-dependent anemia defined as per IWG criteria (transfusion dependency defined by a history of a least 2 units of red blood cell transfusions in the last 28 days for hemoglobin < 8.5 g/dL that was not associated with overt bleeding)
4) Must have adequate organ function as demonstrated by the following </= 14 days prior to starting study drug: ·ALT (SGOT) and AST (SGPT) </= 3 x upper limit of normal (ULN), [unless upon judgment of the treating physician, it is believed to be due to extramedullary hematopoiesis (EMH)] ·Total bilirubin < 3 x ULN or Direct Bilirubin < 2 x ULN ·Serum creatinine </= 2.5 mg/dL ·Absolute neutrophil count >/= 1,000/µL (>/=1.0 x 10^9/L) ·Platelet count >/= 50,000/µL (>/=50 x 10^9/L)
5) Subjects must be willing to receive transfusion of blood products
6) ECOG performance status (PS) of 0, 1, or 2 at screening.
7) Must be willing to adhere to the study visit schedule and other protocol requirements.
8) No active malignancies with the exception of basal cell or squamous cell carcinoma of the skin, or carcinoma (in situ) of the cervix or breast
9) Females of childbearing potential (FCBP) must agree to use two reliable forms of contraception simultaneously or abstinence from intercourse during the following time periods: At least 28 days before starting study drug While participating in the study For at least 28 days after discontinuation from the study. Two methods of reliable contraception must include one highly effective method, hormonal pills, injections, or implants, tubal ligation, partner's vasectomy and one additional effective method (i.e. latex condom, diaphragm, cervical cap) |