OUTLINE: All patients receive high-dose interleukin-2 over 24 hours, followed by low-dose interleukin-2 for 4 days in the absence of toxicity. Patients receive a second cycle beginning 9-13 days after completion of the first cycle, with response assessed approximately 2 months after initiating therapy. Patients with stable or responding disease receive a second course as above; those with a continued response may receive additional courses provided toxicity is limited. Patients are followed for survival.