A novel preoperative inflammatory marker prognostic score in patients with clear cell and non-clear cell renal cell carcinoma.

530 Background: Several inflammatory markers have been studied as potential biomarkers in clear cell renal cell carcinoma (RCC), however few reports have analyzed their prognostic value in aggregate and in non-clear cell histologies. We hypothesize that a combination of preoperative C-Reactive Protein (CRP), albumin, Erythrocyte Sedimentation Rate (ESR), corrected calcium, and AST/ALT ratio into a RCC Inflammatory Score (RISC) could serve as a rigorous prognostic indicator in patients with clear cell and non-clear cell RCC. Methods: Patients that underwent nephrectomy for localized RCC were queried from our nephrectomy database. The optimal threshold for individual biomarkers was determined using grid search methodology, receiver operating characteristic (ROC) analysis, and sensitivity-specificity trade-off analysis. The final score, RISC, was the sum of points accrued from each biomarker (Table). ROC and chi-square analysis was performed to compare the prognostic ability of RISC to SSIGN and UISS. Impact...