Mycophenolate mofetil Active Not Recruiting Phase 2 Trials for Adult B Acute Lymphoblastic Leukemia With t(9;22)(q34.1;q11.2); BCR-ABL1 / Philadelphia Chromosome Positive Childhood Precursor Acute Lymphoblastic Leukemia / Blastic Phase / Recurrent Disease / Childhood Acute Lymphoblastic Leukemia in Remission / Recurrent Childhood Acute Lymphoblastic Leukemia / Chronic Myelogenous Leukemia, BCR-ABL1 Positive / Relapsing Chronic Myelogenous Leukemia / Chronic Phase of Disease / Childhood B Acute Lymphoblastic Leukemia With t(9;22)(q34.1;q11.2); BCR-ABL1 / Recurrent Adult Acute Lymphoblastic Leukemia / Chronic Phase Chronic Myelogenous Leukemia / Blastic Phase Chronic Myelogenous Leukemia / Philadelphia Chromosome Positive Adult Precursor Acute Lymphoblastic Leukemia / Adult Acute Lymphoblastic Leukemia in Remission Treatment