Response to high-dose interleukin-2 (HD IL-2) therapy in patients with brain metastases from metastatic melanoma
e20007 Background: HD IL-2 has been shown to produce durable responses in patients with metastatic melanoma. The purpose of this study was to determine whether the University of Minnesota's outcomes were comparable to previously published data and to analyze subsets of patients to find further data on prognosis and response. Methods: A retrospective analysis was performed all adult patients with Stage IV melanoma treated with HD IL-2 from January 2000 to October 2008 at our institution. HD IL-2 was given I.V. every eight hours as a bolus over 15 minutes at a dose of 600,000 IU/kg. A maximum of 14 doses for each course was given. Results: A total of 15 patients with metastatic melanoma had been treated with HD IL-2 at our institution. Complete response (CR) was seen in 6.67% (N=1), partial response (PR) in 6.67% (N=1), mixed response (MR) in 6.67% (N=1), and stable disease (SD) in 13.33% (N=2). Average time to disease progression (TTDP) was 5.67 months in those with a PR or SD. Two patients with brain metastases had subsequently complete resolution of the brain lesions after HD IL-2 therapy. One of these patients has a CR and is disease free 34 months out from therapy. The other had PR and is currently alive with disease, but has no recurrence of the brain lesion after over 19 months. Twelve of the fifteen patients were able to receive 2 courses of therapy. On average patients tolerated 10.5 HD IL-2 doses with the first course and 8.8 doses with the second course. Common grade (G) 3 and 4 adverse events included hyperbilirubinemia (G 3 = 26.67%), hypotension (G 3 = 6.67%, G 4 = 6.67%), peripheral edema (G 3 = 26.67%), pulmonary edema (G 3 = 13.33%), and hypophosphatemia (G 3 = 6.67%, G 4 = 6.67%). Conclusions: The CR rate of 6.67% and TTDP in those with SD or a PR are comparable to previously published studies. Observed adverse events were also similar to other reports. HD IL-2 has typically been avoided in patients with brain metastases due to concern for neurologic complications from the capillary leak syndrome caused by treatment. We propose further evaluation of this ineligibility for HD IL-2, since carefully selected patients with brain metastases may derive benefit from this treatment. No significant financial relationships to disclose.