PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Karnofsky 60-100% Life expectancy: Not specified Hematopoietic: Granulocyte count at least 1,800/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 2 mg/dL Biliary system stented Renal: Creatinine less than 3.0 mg/dL OR Creatinine clearance at least 40 mL/min Other: If patients have biliary or gastroduodenal obstruction, they must have drainage prior to starting chemoradiation Oral intake of at least 1,500 calories per day No significant infection or other coexistent medical condition