PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Zubrod 0-2 OR Karnofsky 70-100% Life expectancy: Not specified Hematopoietic: WBC at least 4,000/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 1.5 mg/dL AST less than 1.25 times normal Renal: Creatinine no greater than 1.5 mg/dL Cardiovascular: No significant cardiac disease Other: No significant metabolic disorder No significant infection Not pregnant or nursing Effective contraception must be used by fertile women