Patients receive tetrahydrouridine IV over 5 minutes followed by cytochlor IV for 3 days on week 1 and 5 days a week on weeks 2-4 and cisplatin IV over 30-60 minutes once in weeks 2 and 5. Patients also undergo radiotherapy 5 days a week during weeks 2-7. Treatment continues in the absence of disease progression or unacceptable toxicity.