OUTLINE: This is a multicenter study. Patients are stratified according to tumor type (T2-4a, N0, M0; potentially resectable; no contraindication to surgery vs T2-4b, N0 or N1 or pN1, M0; refused surgery or medical contraindications to surgery). (Accrual for stratum I was completed as of 10/23/2001.) Stratum I (resectable disease): Regimen A: Patients undergo radiotherapy 5 days a week for 5 weeks. Patients also receive fluorouracil IV continuously and cisplatin IV continuously on days 1-4 during weeks 1 and 4. If complete response is achieved by week 5, patients proceed to regimen B. If partial response or progression is observed, patients undergo cystectomy. If cystectomy is refused, patients proceed to regimen B. Regimen B: Patients undergo radiotherapy 5 days a week for 2 weeks. Patients also receive fluorouracil and cisplatin as in regimen A on weeks 2 and 5. (Accrual for stratum I was completed as of 10/23/2001.) Stratum II (unresectable disease): Patients undergo radiotherapy 5 days a week for 7 weeks. Patients also receive fluorouracil and cisplatin as in regimen A on weeks 1, 4, and 7. Quality of life is assessed at baseline, at 6 months, and then at 1 year. Patients are followed at 6-8 weeks, every 6 months for 2 years, and then annually thereafter.