In patients who are receiving intravenous high dose Interleukin-2, patients will be randomized into two groups: group one will receive nystatin swish and swallow immediately before initiation of IL-2, and the second group will receive a placebo. The patients in each group will be monitored and evaluated for differences in the rate and severity of development of oral irritation during treatment. They will also be studied for differences between the two groups in the number of doses of IL-2 taken.