Rationale: Chemotherapy with fludarabine, cyclophosphamide and anti-thymocyte globulin may induce the engraftment cross the immunologic barrier in the setting of HLA-haploidentical allogeneic hematopoietic cell transplantation. In addition, depletion CD3±CD19 cells may contribute to prevent developing severe acute graft versus host disease (GVHD) in haploidentical transplantation.