OUTLINE: This is a randomized study. Stem cells are harvested and cryopreserved. All patients receive busulfan/cyclophosphamide or cyclosporine/total body irradiation as a preparative regimen. Arm I: Patients randomized to the graft versus host disease (GVHD) induction arm receive oral cyclosporine twice a day beginning on day 0 and continuing for at least 28 days, followed by peripheral blood stem cell (PBSC) infusion. At the time the white blood cell count begins to recover, subcutaneous interferon gamma is administered for 10 doses, followed 2 days later by subcutaneous interleukin-2 (IL-2) for 18 doses. Arm II: Patients do not receive autologous GVHD therapy after the PBSC transplant. Both arms should receive radiation to the site of lymphoma after recovering from the stem cell transplantation. Patients are followed at 6 months, 1 year, and 2 years posttransplant.