OUTLINE: This is an open label study. Patients receive bolus interleukin-2 on days 1-5 and 8-12. The cycle repeats every 3 weeks. Patient response is evaluated after 2 cycles. Patients with stable disease, partial, or complete response may be treated with maintenance IL-2 for up to 4 additional cycles. Patient evaluation is performed after every 2 cycles. At this point, patients with stable or responding disease may be treated with IL-2 every 6 weeks until disease progression, intolerable toxic effects, or 2 cycles beyond complete response.