Rituximab Recruiting Phase 2 Trials for Blast Phase Chronic Myelogenous Leukemia, BCR-ABL1 Positive / Acute Lymphoblastic Leukaemia Recurrent / Acute Myeloid Leukemia With BCR-ABL1 / Acute Lymphoblastic Leukaemias (ALL) / Philadelphia Chromosome Positive / Accelerated Phase Chronic Myelogenous Leukemia, BCR-ABL1 Positive / Refractory Acute Lymphoblastic Leukemia Treatment