Systemic immune inflammation index is a promising non-invasive marker for the prognosis of the patients with localized renal cell carcinoma.

Our aim was to evaluate the prognostic implications of a preoperative novel index, systemic immune inflammation index (SII) in patients undergoing surgery due to renal cell carcinoma. A retrospective analysis of 176 patients who underwent radical nephrectomy and diagnosed with RCC was carried out. Systemic immune inflammation index, which is calculated by neutrophil x platelet/lymphocyte, and other inflammation indexes such as neutrophil/lymphocyte ratio, platelet/lymphocyte were included. The Kaplan-Meier analysis was plotted, and the groups were compared using a log-rank test. The ROC curve for the aforementioned inflammation indexes was plotted. SII (× 109/l) for lower and higher T stage group were 743.70 ± 587.55 and 907.06 ± 631.96, respectively, which is statistically significant (p = 0.01). Patients with higher Fuhrman grade (G3 and G4) were found to have higher SII (p = 0.001). SII 830 was demonstrated as the best cut-off value for overall survival. The optimal cut-off point for SII was defined as 850 for disease-specific survival. High SII scores were associated with poor overall survival in RCC patients (p = 0.034). However, no significant association was found for disease-specific survival (p = 0.29). Systemic immune inflammation index was found to be associated with increased TNM stage and poor prognosis of RCC patients udergoing radical nephrectomy.