- Chemoradiotherapy (course 1): Patients undergo external beam radiotherapy once daily, 5 days a week, for approximately 6 weeks. Beginning on the first day of radiotherapy, patients receive cisplatin IV over 1 hour on days 1-5, etoposide IV over 2 hours on days 1-3, and vincristine IV on days 5, 12, 19, 26, and 33. Patients proceed to course 2 of chemoradiotherapy 7 days prior to completion of radiotherapy.