PATIENT CHARACTERISTICS: Age: 12 and over Performance status: Zubrod 0-2 Life expectancy: Not specified Hematopoietic: Absolute neutrophil count at least 500/mm3 Platelet count at least 20,000/mm3 Hepatic: Bilirubin no greater than 1.5 mg/dL SGPT less than 4 times upper limit of normal Renal: Creatinine no greater than 3.0 mg/dL Other: Not pregnant or nursing Fertile patients must use effective contraception Must not be eligible or willing to undergo treatment of a higher priority HIV negative No other prior malignancies within the last 5 years except basal cell carcinoma of the skin or carcinoma in situ of the cervix treated with curative intent No other concurrent serious illness or active infection No mental or social reasons that may preclude study