PATIENT CHARACTERISTICS: Age: Not specified Performance status: ECOG 0-2 Karnofsky 60-100% Life expectancy: Not specified Hematopoietic: Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin less than 2.0 mg/dL Renal: Creatinine no greater than 1.5 mg/dL Other: Not pregnant or nursing Fertile patients must use effective contraception No other malignancy within the past 5 years, except: Nonmelanomatous skin cancer Carcinoma in situ of the cervix No significant active infection