RecruitingDevice studyProphylactic TCRaB+ and CD19+ Depleted Donor Lymphocyte Infusion After Allogeneic Stem Cell Transplant in High-Risk Patients With Hematologic MalignanciesThis study is being done to assess the safety and determine the maximum tolerable dose (MTD) of TCRαβ+/CD19+-depleted Donor Lymphocyte Infusion (αβT/B dep-DLI) after allogeneic stem cell transplant (allo-SCT) in highrisk patients with hematologic malignancies.