Nonmyeloablative Allogeneic Hematopoietic Cell Transplantation From HLA Matched Sibling Donors For Treatment Of Patients With High Risk Acute Lymphocytic Leukemia In Complete Remission

OBJECTIVES:

• Determine if a one-year disease free survival of 40% and a day 200 transplant-related mortality of less than 25% can be achieved in patients with high-risk acute lymphoblastic leukemia in complete remission treated with a nonmyeloablative conditioning regimen comprising fludarabine and total body irradiation followed by allogeneic peripheral blood stem cell or bone marrow transplantation.
• Evaluate the efficacy and toxicity of donor lymphocyte infusion in the treatment of minimal residual disease after nonmyeloablative allografting in these patients.

OUTLINE: This is a multicenter study.

Patients receive a nonmyeloablative conditioning regimen comprising fludarabine IV on days -4 to -2 and total body irradiation (TBI) on day 0. Children undergo allogeneic peripheral blood stem cell transplantation (PBSCT) or bone marrow transplantation after TBI on day 0. Adults undergo filgrastim (G-CSF)-mobilized allogeneic PBSCT after TBI on day 0.

Patients also receive graft-versus-host disease (GVHD) prophylaxis therapy comprising oral cyclosporine twice daily on days -3 to 56 and then tapered and oral mycophenolate mofetil once at 5-10 hours after transplantation on day 0 and then twice daily on days 1-27.