PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Karnofsky 80-100% Life expectancy: Not specified Hematopoietic: Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 2 times upper limit of normal (ULN) SGOT no greater than 2 times ULN Alkaline phosphatase no greater than 2 times ULN Renal: Creatinine no greater than 2 mg/dL Glomerular filtration rate no less than 30 Other: HIV negative Not pregnant or nursing Fertile patients must use effective contraception No other serious medical condition No other prior malignancies except carcinoma in situ of the cervix, nonmelanomatous skin cancer, Dukes A colorectal cancer from which patient has been disease free for past 5 years, or stage I or II breast cancer from which patient has been disease free for past 10 years