PATIENT CHARACTERISTICS: Age: Not specified Performance status: Karnofsky 50-100% Life expectancy: Not specified Hematopoietic: Not specified Hepatic: Not specified Renal: Not specified Other: No other prior malignancy within the past 3 years except the following: Adequately treated basal cell or squamous cell skin cancer Carcinoma in situ of the cervix Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception