Mycophenolate mofetil Active Not Recruiting Phase 2 Trials for Polycythemia Vera, Post-Polycythemic Myelofibrosis Phase / Refractory Anemia With Ring Sideroblasts / Chronic Myelomonocytic Leukemia / Refractory Anemia / Essential Thrombocythemia (ET) / Primary Myelofibrosis / Paroxysmal Nocturnal Haemoglobinuria (PNH) / Myeloproliferative Neoplasms / Polycythemia Vera (PV) / Refractory Cytopenia With Multilineage Dysplasia / Atypical Chronic Myeloid Leukemia, BCR-ABL1 Negative / Refractory Cytopenia With Multilineage Dysplasia and Ring Sideroblasts / Refractory Anemia With Excess Blasts / de Novo Myelodysplastic Syndrome Treatment