PATIENT CHARACTERISTICS: Age: 18 and over Performance status: SWOG 0-2 Life expectancy: At least 6 weeks Hematopoietic: Granulocyte count at least 750/mm3* Platelet count at least 50,000/mm3* Hemoglobin at least 7.5 g/dL* * Unless bone marrow infiltrated by lymphoma Hepatic: Bilirubin less than 1.25 times upper limit of normal AST no greater than 3.0 times normal Renal: Creatinine clearance greater than 60 mL/min Cardiovascular: No myocardial infarction within the past 6 months No history of congestive heart failure No angina No serious arrhythmia requiring treatment Other: No other prior or concurrent malignancy except: Inactive, nonvisceral Kaposi's sarcoma not requiring chemotherapy Curatively treated basal cell or squamous cell skin cancer Curatively treated carcinoma in situ of the cervix No severe, acute opportunistic infection No acute or intermittent infection (other than oropharyngeal candidiasis) requiring treatment within 2 weeks before study entry Not pregnant Negative pregnancy test Fertile patients must use effective contraception