Systemic immune-inflammation index to predict survival in Caucasian patients with metastatic urothelial carcinoma.

Abstract

e16015 Background: The systemic immune-inflammation index (SII) is a prognostic factor in various malignancies that probably reflects a state of immunity. The objective of this retrospective analysis was to explore prognostic value of the SII at baseline and at week 6 during first-line platinum-based chemotherapy in Caucasian population with metastatic urothelial cancer (MUC). Methods: We evaluated 185 consecutive MUC (152 bladder, 72 upper tract) patients (139 men) treated with first-line platinum-based chemotherapy at National Cancer Institute between 2000-2015. Median Karnofsky index was 90% (30–100%), visceral metastases were present in 86 patients. SII was based on platelets (P), neutrophils (N) and lymphocytes (L) counts defined as PxN/L. Progression-free survival (PFS), overall survival (OS) and their 95% CI were estimated by Kaplan-Meier method and compared with logrank test. The study population was dichotomized by median into high SII and low SII groups. Multivariate Cox regression analysis included Karnofski index, status of visceral metastases together with baseline SII and SII at week 6, respectively. Results: At median follow-up 10 months (1-139 months), 170 patients experienced disease progression and 168 of them died.Patients with low SII at baseline had significantly better PFS and OS opposite to those with high SII (HR = 0.62, 95% CI 0.45-0.84 for PFS and HR = 0.52, 95% CI 0.38-0.71 for OS, respectively). Similarly, patients with low SII at 6 weeks had significantly better PFS and OS compared to those with high SII (HR = 0.61, 95% CI 0.45-0.83 for PFS and HR = 0.54, 95% CI 0.40–0.74 for OS, respectively). Multivariate analysis confirmed independent prognostic value of baseline SII and SII at week 6 for PFS and OS. Conclusions: Both, the SII at baseline and at week 6 during treatment with first-line chemotherapy represent independent prognostic factors for Caucasian population with MUC. Based on SII, patients could be stratified into future clinical trials. MUC patients with high SII might be candidates for an experimental first-line treatment.