| Inclusion Criteria: | 1) Patients must have histologically confirmed myelofibrosis with myeloid metaplasia
2) Patients requiring therapy, including those previously treated and relapsed or refractory, or if newly diagnosed, with intermediate or high risk according to Lille scoring system (adverse prognostic factors are: Hb </= 10 g/dl, WBC </= 4 or >/= 30 x 10^9/L; risk group: 0 = low, 1 = intermediate, 2 = high) or with symptomatic splenomegaly. )
3) Patients must be greater than or equal to 18 years of age
4) Patients must have an Eastern Cooperative Oncology Group (ECOG) Performance Status less than or equal to 2
5) Patients must have normal organ function as defined below: ·Total bilirubin: less than or equal to 2 mg/dL unless resulting from hemolysis ·AST(SGOT)/ALT(SGPT): less than or equal to 2.5 x institutional upper limit of normal ·Creatinine: within normal institutional limits OR ·Calculated creatinine clearance: greater than or equal to 50 mL/min/1.73 m^2 for patients with creatinine levels above institutional normal ·Baseline hematological parameters: no restrictions
6) Women of child-bearing potential must have a negative serum pregnancy test result prior to study entry. In addition, because of the potential for unknown risks to an unborn child that could result from exposure to GX15 070MS, women of child-bearing potential and men with partners of child-bearing potential must agree to abstain from sexual activity which would result in pregnancy for the duration of study participation
7) Patients must be willing to submit to blood sampling for the planned PK and PD analyses
8) Patients must have the ability to understand and the willingness to sign a written informed consent form |