Haploidentical Stem Cell Transplant with Prophylactic Natural Killer DLI for Lymphoma, Multiple Myeloma, and CLL

This study seeks to examine the investigational use of the conditioning regimen (bendamustine, fludarabine, and rituximab) prior to haploidentical peripheral blood allogeneic stem cell transplantation with Post-Transplant Cyclophosphamide. The study will also test the investigational use of CD56-enriched Donor Lymphocyte Infusion to see if this treatment is safe, and whether or not it will help patients achieve better outcomes post-transplant, including reduced risk of Graft-Versus-Host Disease (GVHD), and preventing disease relapse.