Inclusion Criteria:

          -  Patients with a diagnosis of primary myelofibrosis (PM), post polycythemia vera
             myelofibrosis (PPV MF), or post essential thrombocythemia myelofibrosis (PET MF)
             requiring therapy, including those previously treated and relapsed or refractory, or
             if newly diagnosed, with intermediate or high risk according to International Working
             Group (IWG-MRT) criteria

          -  Patients with a diagnosis of myelodysplastic syndrome/myeloproliferative neoplasm,
             unclassifiable (MDS/MPN-U) that require therapy

          -  Understanding and voluntarily signing an Institutional Review Board (IRB)-approved
             informed consent form

          -  Eastern Cooperative Oncology Group (ECOG) performance status 0 to 2

          -  Direct bilirubin of =< 2 mg/dL

          -  Serum glutamate pyruvate transaminase (SGPT) =< 2.5 x upper limit of normal (ULN) or 5
             x ULN if related to MF or MDS/MPN associated liver infiltration

          -  If total bilirubin is =< 2, fractionation is not required for eligibility
             determination

          -  Creatinine =< 2.5 mg/dL

          -  Platelets >= 50 x 10^9/L

          -  Absolute neutrophil count (ANC) >= 1.0 x 10^9/L

        Exclusion Criteria:

          -  For the MF and MDS/MPN-U arms (arms 1 & 2), use of any other standard drug (except
             hydroxyurea, anagrelide, growth factors, Revlimid, clofarabine, etc) or experimental
             drug or therapy within 14 days of starting study therapy

          -  Patients previously treated with RUX or AZA (only applicable for the MF and MDS/MPN
             arms)

          -  Any serious psychological condition or psychiatric illness that would prevent the
             subject from signing the informed consent document, in the investigator opinion

          -  Pregnant or lactating females

          -  Subjects of childbearing potential who are unwilling to take appropriate precautions
             (from screening through follow-up) to avoid becoming pregnant or fathering a child;
             females of non-childbearing potential are defined as women who a) are 55 years of age
             with history of amenorrhea for 1 year OR b) are surgically sterile for at least 3
             months; for females of childbearing potential, or for males, pregnancy must be avoided
             by taking appropriate precautions; these precautions and the methods of contraception
             should be communicated to the subjects and their understanding confirmed

          -  Any condition which places the subject at unacceptable risk if he/she were to
             participate in the study or confounds the ability to interpret data from the study

          -  Known positive for human immunodeficiency virus (HIV) or with known active infectious
             hepatitis, type A, B or C

          -  Patients with active malignancy of other type than required for this study, are not
             eligible with the exception of currently treated basal cell, squamous cell carcinoma
             of the skin, or carcinoma "in situ" of the cervix or breast; patients with
             malignancies with indolent behavior such as prostate cancer treated with radiation or
             surgery can be enrolled in the study as long as they have a reasonable expectation to
             have been cured with the treatment modality received