Inducible Regulatory T Cells (iTregs) in Non-Myeloablative Sibling Donor Peripheral Blood Stem Cell Transplantation

This is a phase I single center dose escalation study with an extension at the best available dose to determine the tolerability of inducible regulatory T cells (iTregs) when given to adult patients undergoing non-myeloablative HLA-identical sibling donor peripheral blood stem cell (PBSC) transplantation for the treatment of a high risk malignancy. Up to 5 dose cohorts will be tested. Once the tolerable dose is determined for iTregs, enrollment will continue with an additional 10 patients using sirolimus/Mycophenolate mofetil (MMF) graft-versus-host disease (GVHD) prophylaxis to gain further safety information and to provide pilot data in this treatment setting.