- Part B : Beginning 2 weeks after completion of regimen A, patients receive etoposide IV over 2 hours and carboplatin IV over 1 hour on days 1-3. PBSC are reinfused on day 5. G-CSF is administered SC twice daily beginning 6 hours after completion of etoposide and carboplatin infusions and continuing until blood counts recover. G-CSF is held on the morning of PBSC transplantation and restarted beginning 6 hours after completion of PBSC transplantation. Treatment continues every 2 weeks for 3 courses in the absence of disease progression or unacceptable toxicity. Patients with insufficient PBSC for the second course receive PBSC combined with ABM. Patients with insufficient PBSC for the third course receive ABM.