PATIENT CHARACTERISTICS: Age: 18 and over Performance Status: ECOG 0-2 Life Expectancy: Not specified Hematopoietic: Hematocrit at least 25 WBC at least 3,000/mm3 Platelet count at least 100,000/mm3 PT and PTT within normal limits Hepatic: Bilirubin less than 2.0 mg/dL Renal: Creatinine less than 2.0 mg/dL Cardiovascular: No myocardial infarction within 6 months No medication for congestive heart failure or cardiac arrhythmias No hypertension (unless blood pressure is stable off medication) Pulmonary: Must have reasonable respiratory reserves and not require supplemental oxygen No dyspnea at rest Oxygen saturation must be greater than 90% for patients with risk of respiratory symptoms Other: Not HIV positive Not positive for hepatitis B antigen No chronic underlying immunodeficiency No concurrent active infection requiring antibiotic therapy Not pregnant or nursing No concurrent serious illness No family history of malignant hyperthermia No hypersensitivity to interferon alfa-2b and interleukin-2