Impact of Routine Laboratory Parameters in Patients Undergoing Radical Cystectomy for Urothelial Carcinoma of the Bladder: A Long-Term Follow-Up

Abstract

OBJECTIVES: Patients' oncological outcome after radical cystectomy (RC) due to urothelial carcinoma of the urinary bladder (UCB) is always up for debate. There is accumulating evidence on the influence of routine blood parameters. We aimed to identify reasonable and easy-to-detect biomarkers, such as preoperative C-reactive protein (CRP) and hemoglobin (Hb) levels, as predictors of overall survival (OS) and cancer-specific survival (CSS) in patients undergoing RC for UCB. MATERIALS AND METHODS: This is a large single-center study in which both preoperative CRP and Hb levels were available in 1,043 patients undergoing RC for UCB from 2004 to 2018 with a median follow-up time of 22 months (mean 38, max. 170). We used the Kaplan-Meier method, log-rank test, and Cox regression models for assessment of OS and CSS. Using our data, we validated an existing outcome prediction score (TNR-C). RESULTS: Median CRP level was 0.5 mg/dL (IQR 0.2-1.4), and median Hb level was 13.4 g/dL (IQR 11.9-14.7). We found that patients with CRP values above the median reached a significantly lower median survival than those with CRP values below the median (23 vs. 83 months, p < 0.001). The TNR-C score was successfully validated, and we discriminated between 3 risk groups (5-year CSS: 76, 40, and 16% for low, intermediate, and high risk, respectively). We observed a similar outcome for patients with a Hb level below the median: CSS was significantly poorer than with Hb levels above the median (median CSS 27 vs. 91 months, p < 0.001). Multivariant analysis showed CRP and Hb levels to be independent prognostic parameters for CSS and OS. CONCLUSIONS: We found elevated preoperative CRP levels and decreased Hb levels to be independent prognostic factors indicating an unfavorable outcome in patients undergoing RC for UCB and were able to validate the TNR-C score in a large patient cohort. We propose using these routine biomarkers for individual risk stratification and optimization of therapeutic strategies in patients undergoing RC for UCB.