Second line axitinib in metastatic renal cell carcinoma: Evaluation of prognostic factors influencing outcome.

495 Background: Axitinib has been approved for 2nd line treatment in the UK for patients with advanced renal cell carcinoma on the basis of the AXIS study, which showed improved progression free survival (PFS) and a trend towards overall survival (OS) benefit. There is no randomised data to support the use of Axitinib after first line Pazopanib. Hence, we compared the efficacy of Axitinib after first line Pazopanib or Sunitinib. The influence of Heng prognostic risk score (HPRS) at initiation of Axitinib, previous nephrectomy, and haemoglobin (Hb) rise during Axitinib treatment on outcome was also evaluated. Methods: Thirty one patients were commenced on Axitinib between May 2013-May 2016. Patient demographics, laboratory parameters, and survival data were collected retrospectively. Data were analysed in October 2016, which served as a censor date for patients who were alive. Analysis of PFS and OS was performed by Kaplan-Meier estimates and log-rank test. Results: All 31 patients received axitinib as 2nd line treatment. At the time of analysis, 14 patients were alive and 7 remained on axitinib. The prognostic factors influencing outcome are shown in the table. Conclusions: There was no significant difference in PFS or OS regardless of first line treatment, supporting the use of axitinib post pazopanib or sunitinib. Prior nephrectomy, and favourable HPRS significantly predict better PFS and OS. The impact of Hb rise needs further validation in a larger cohort.[Table: see text]