NON-PBSCT GROUP: Patients receive etoposide, HiDAC, and G-CSF as in the PBSCT group. After hematopoietic recovery, patients then receive HiDAC IV over 3 hours every 12 hours on days 1, 3, and 5. Treatment repeats no earlier than 28 days after prior course and no later than 14 days after hematopoietic recovery for one more course.