In the transplant phase, patients with non-Hodgkin's lymphoma who have not exceeded pretransplant radiotherapy limits receive cyclophosphamide IV over 2 hours on days -7 and -6 and total body irradiation twice daily on days -4 through -1. Autologous PBSC are reinfused on day 0. Patients receive G-CSF IV daily beginning on day 0 and continuing until day 21 or until blood counts recover.