 - Phase I: Patients receive oral nelfinavir mesylate twice daily beginning 1-2 weeks before the initiation of chemoradiotherapy and continuing until the completion of radiotherapy. Patients undergo thoracic radiotherapy once daily 5 days a week for 7-8 weeks. Patients also receive cisplatin IV on days 1, 8, 29, and 36 and etoposide IV on days 1-5 and 29-33. After completion of chemoradiotherapy, patients receive two additional courses of cisplatin and etoposide. 