PATIENT CHARACTERISTICS: Age: 16 to 75 Performance status: ECOG 0 or 1 Hematopoietic: WBC at least 4,000 Platelets at least 125,000 Hemoglobin at least 9.8 g/dL (6.1 mmol/L) Hepatic: Bilirubin no greater than 2 times normal AST no greater than 2 times normal Renal: Creatinine no greater than 1.6 mg/dL (140 micromoles/L) Cardiovascular: No ventricular or supraventricular arrhythmia requiring treatment No congestive heart failure (NYHA class 3/4 status) Other: No uncontrolled infection No requirement for ongoing steroids, NSAIDs, or other immunomodulators No organic brain syndrome or significant impairment of basal cognitive function No psychiatric disorder that would preclude study participation or would be exacerbated by study therapy (e.g., depression) No second malignancy except: In situ cervical cancer Nonmelanomatous skin cancer No pregnant or nursing women