Real-world treatment patterns and overall survival in previously treated advanced renal cell carcinoma patients receiving nivolumab in the UK.

e16561 Background: CheckMate 025 demonstrated favorable efficacy and safety results for nivolumab monotherapy in previously treated advanced or metastatic renal cell carcinoma (aRCC). However, real-world evidence on treatment patterns and clinical outcomes is limited. Methods: This multi-centre, retrospective cohort study examined treatment patterns and overall survival (OS) in aRCC patients treated with nivolumab monotherapy. Eligible patients who initiated nivolumab at second-line (2L) or beyond (index) between 01 March 2016 and 30 June 2018 were sampled from four UK centers. Data were extracted using an electronic case report form from index to earliest of: most recent visit; death; end of follow up (31 May 2019). Results: Overall , 151 patients were included in analyses (mean age at index 66.9 years, 72.2% male, median follow-up from index 15.2 months), with 109 (72.2%) and 42 (27.8%) receiving nivolumab at 2L and ≥ third-line (3L+), respectively. Key clinical characteristics are outlined in Table 1. All 2L nivolumab patients had received first-line (1L) tyrosine kinase inhibitors (TKI), pazopanib (57.8%), sunitinib (30.3%), or both in sequence (10.1%). After 2L nivolumab, 3L cabozantinib (36/52, 69.2%) was most common. Most 3L nivolumab patients received 2L TKI (31/36, 86.1%) - commonly axitinib (70.9%). After 3L nivolumab, most patients received fourth-line cabozantinib (8/12, 66.7%). Median time on line of therapy (LOT) decreased with LOT progression: from 7.8 months at 1L to 4.6 months at fifth-line (5L). The proportion of patients who discontinued treatment due to adverse events decreased by LOT, (28.6%, 22.7%, 16.0% and 0%, and 34.7%, 28.1%, 0% and 0% from 2L to 5L, overall and for nivolumab treatment, respectively). Overall, median OS from nivolumab initiation was 19.2 months [95% CI, 16.9-27.0]. Patients who received 2L nivolumab had longest median OS (23.0 months [95% CI, 17.2, not reached]), comparable to CheckMate 025 (25.8 months [95% CI, 22.2-29.8]). Median OS for 3L+ nivolumab patients was 12.4 months [95% CI, 8.8, 23.2]. Among 2L nivolumab patients, 73.9%, 46.2%, and 33.6% survived 12, 24, and 36 months, respectively. For the same respective timeframes, 52.4%, 24.7%, and 18.6% of 3L+ nivolumab patients survived. Conclusions: This study provides real-world evidence on the characteristics, treatment patterns and effectiveness of 2L or ≥ 3L nivolumab monotherapy in previously treated aRCC patients. OS results from UK routine clinical care were comparable to those found in CheckMate 025.[Table: see text]