Conditional survival (CS) of metastatic renal cell carcinoma (mRCC) patients treated with high dose interleukin-2 (HD IL-2).

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460 Background: CS is a clinically useful prediction measure that adjusts prognosis of patients on the basis of survival since treatment initiation or therapy duration. CS was recently reported in mRCC patients treated with VEGF targeted therapy in patients stratified by Heng’s criteria. CS has not been reported in mRCC in the context of treatment with HD IL-2. Methods: Patients with histologically confirmed clear cell mRCC treated with HD IL-2 at the University of Utah Huntsman Cancer Institute from 2000 to 2012 were evaluated. Performance status and prognostic risk groups were included. Two-year CS was defined as the probability of surviving an additional 2 years from initiation of HD IL-2 to 18 months after the start of HD IL-2 at 3-month intervals estimated by Kaplan-Meier methodology. Results: A total of 85 patients were included with a median age of 56 years (range 32-76 years) and 79% (n = 67) were male. The median overall survival from HD IL-2 administration was 817 days. Stratification by Heng’s criteria at therapyinitiation resulted in survival estimates for the favorable (n = 13; 15%), intermediate (n = 56; 66%) and poor (n = 16; 19%) prognostic groups of 1616 (p = 0.1993 vs intermediate), 817 (p = 0.0041 vs poor), and 365 (p < 0.0001 vs favorable) days, respectively. Two-year overall CS increased from 56.2% at therapy initiation to 89.5% at 18 months (Table). Two-year CS stratified by Heng’s favorable, intermediate, and poor prognostic risk groups is presented in the Table. Conclusions: CS is a relevant prediction measure in the context of mRCC treated with HD IL-2.A longer survival interval from HD IL-2 treatment was associated with an increased survival probability. CS in this cohort was especially relevant in adjusting prognosis for patients with Heng’s intermediate risk. [Table: see text]

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