PRIOR CONCURRENT THERAPY: Biologic therapy: No prior interleukin-2 and interferon alfa-2b in combination therapy Chemotherapy: No prior systemic chemotherapy within 4 weeks of study and recovered Endocrine therapy: No concurrent corticosteroid therapy Radiotherapy: No prior radiotherapy within 4 weeks of interleukin-2 therapy No prior stereotactic radiosurgery or gamma knife therapy within 1 week of interleukin-2 therapy Surgery: No prior organ allograft transplantation Must be recovered from prior surgery Other: No concurrent cyclosporin therapy No concurrent treatment with other anticancer agents