Mycophenolate mofetil Active Not Recruiting Phase 2 Trials for Adult Acute Myeloid Leukemia With 11q23 (MLL) Abnormalities / Secondary Myelodysplastic Syndromes / Adult Acute Myeloid Leukemia With T(8;21)(q22;q22) / Recurrent Adult Acute Myeloid Leukemia / Previously Treated Myelodysplastic Syndromes / Recurrent Childhood Acute Myeloid Leukemia / Refractory Anemia With Excess Blasts / Refractory Anemia With Ringed Sideroblasts / Chronic Myelomonocytic Leukemia / Adult Acute Myeloid Leukemia With T(16;16)(p13;q22) / Refractory Anemia With Excess Blasts in Transformation / Adult Acute Myeloid Leukemia With Del(5q) / Refractory Cytopenia With Multilineage Dysplasia / Adult Acute Myeloid Leukemia With T(15;17)(q22;q12) / Secondary Acute Myeloid Leukemia (Secondary AML, sAML) / Adult Acute Myeloid Leukemia With Inv(16)(p13;q22) / Childhood Myelodysplastic Syndromes Treatment