OUTLINE: Patients receive immunosuppressive medications consisting of oral mycophenolate mofetil and tacrolimus twice a day beginning on day -8 and continuing through day 45 (in the absence of graft versus host disease). Patients also receive daclizumab IV over 30 minutes on days -1, 3, and 8. Patients undergo allogeneic peripheral blood stem cell (PBSC) transplantation with donor CD34+ cells IV on day 0. If there is 0-80% donor hematopoiesis, patients receive donor lymphocyte infusions with CD3+ cells IV on days 75, 165, and 270.