Dermis/ultrastructure; Leukemic Infiltration/pathology; Precursor B-Cell Lymphoblastic Leukemia-Lymphoma/pathology; Scalp/pathology; Allografts; Antineoplastic Agents/therapeutic use; Antineoplastic Combined Chemotherapy Protocols/therapeutic use; Combined Modality Therapy; Cord Blood Stem Cell Transplantation; Dasatinib/administration & dosage; Female; Fusion Proteins, bcr-abl/antagonists & inhibitors; Fusion Proteins, bcr-abl/genetics; Humans; Imidazoles/therapeutic use; Immunophenotyping; Leukemic Infiltration/diagnosis; Leukemic Infiltration/drug therapy; Leukemic Infiltration/radiotherapy; Middle Aged; Neoplasm Proteins/antagonists & inhibitors; Neoplasm Proteins/genetics; Philadelphia Chromosome; Precursor B-Cell Lymphoblastic Leukemia-Lymphoma/diagnosis; Precursor B-Cell Lymphoblastic Leukemia-Lymphoma/drug therapy; Precursor B-Cell Lymphoblastic Leukemia-Lymphoma/genetics; Precursor B-Cell Lymphoblastic Leukemia-Lymphoma/radiotherapy; Precursor B-Cell Lymphoblastic Leukemia-Lymphoma/therapy; Protein Kinase Inhibitors/therapeutic use; Pyridazines/therapeutic use; Recurrence; Remission Induction