Patients who have received prior radiotherapy receive cyclophosphamide IV over 2 hours daily on days -6 through -3, carmustine IV over 1 hour on day -6, and etoposide IV over 4 hours every 12 hours for a total of 6 doses on days -6 through -4. Autologous PBSC are reinfused on day 0. Patients also receive GM-CSF IV over 2 hours daily and G-CSF IV over 15 minutes daily beginning on day 0 and continuing until day 28 or until blood counts recover.