Myelodysplastic syndrome with isolated del(5q) (5q-syndrome) Patients with a myelodysplastic/myeloproliferative neoplasm Myelodysplastic syndrome Any evidence of myelodysplastic syndrome or marrow chromosomal changes suggesting myelodysplasia (-7, -5 etc) Bone marrow examination revealing myelodysplastic syndrome or megakaryocyte underproduction for patients with a platelet count < 50,000/uL No prior history of myelodysplastic syndrome or other myeloid malignancy Prior treatment of myelodysplastic syndrome or myeloproliferative neoplasm with hypomethylating agent acceptable Myelodysplastic syndrome with multi-lineage dysplasia with or without chromosomal abnormalities Myelodysplastic/myeloproliferative disease\r\n* Juvenile myelomonocytic leukemia (JMML)\r\n* Myelodysplastic syndrome and/or pre-leukemia at any stage Myelodysplastic syndrome Known history of myelodysplastic syndrome/leukemia at any time Criteria 5 Myelodysplastic syndrome Known presence of intermediate- or high-grade myelodysplastic syndrome. Diagnosis of myelodysplastic syndrome. History of myelodysplastic syndrome or organ transplantation Myelodysplastic syndromes For Cohort A: Has myelodysplastic syndrome Presence of known intermediate- or high-grade myelodysplastic syndrome History of myelodysplastic syndrome or solid organ transplantation Subject who has any histopathologic finding consistent with myelodysplastic syndrome on bone marrow studies. Myelodysplastic syndrome Patients must not have been diagnosed with myelodysplastic syndrome or with any malignancy other than neuroblastoma Myelodysplastic syndrome Patients who have a history of myelodysplastic syndrome Diagnosis of Myelodysplastic Syndrome. Prior treatment of myelodysplastic syndrome or myeloproliferative neoplasm acceptable Myelodysplastic syndrome with fibrosis (MF 3) Known presence of myelodysplastic syndrome Known presence of myelodysplastic syndrome Known presence of myelodysplastic syndrome Myelodysplastic syndrome\r\n* =< 55 years of age and >= 10% blasts, not responsive to hypomethylating agents and/or conventional therapy Patients with low- and Int-1-risk myelodysplastic syndrome Patients with myelodysplastic syndrome Patients with myelodysplastic syndrome Patients with myelodysplastic syndrome. Known myelodysplastic syndrome Known myelodysplastic syndrome. Phase I: Hematologic malignancy diagnosis including any subset of myeloma, lymphoma, leukemia, or myelodysplastic syndrome Phase II: Hematologic malignancy diagnosis including any subset of lymphoma, leukemia, or myelodysplastic syndrome Known relapsed acute leukemia or myelodysplastic syndrome Current Myelodysplastic syndrome only subjects Subjects with a history of myelodysplastic syndrome Diagnosed with hematological malignancy or marrow failure syndrome such as but not limited to: aplastic anemia, myelodysplastic syndrome or leukemia Subjects with treatment-related myelodysplastic syndrome. Myelodysplastic Syndrome Current or prior history of myelodysplastic syndrome, leukemia or clinically significant (as per Investigator judgment) bone marrow failure. Prior intensive chemotherapy or stem cell transplantation for the treatment of myelodysplastic syndrome