Patients with high-risk stage II or III disease receive cyclophosphamide IV over 1 hour on days 1-3 and doxorubicin IV over 4-6 hours on day 1 on weeks 1, 7, 13, 19, 25, and 31. Patients also receive etoposide IV over 4 hours and carboplatin IV over 1 hour on days 1-3 on weeks 4, 10, 16, 22, 28, and 34.