Clinical Value of Postoperative Neutrophil-to-Lymphocyte Ratio Change as a Detection Marker of Bladder Cancer Recurrence

Purpose This study investigated the clinical significance of postoperative neutrophil-to-lymphocyte ratio (NLR) changes in bladder cancer recurrence. Patients and Methods For evaluating the predictive value of postoperative dynamic change of NLR, a retrospective cohort study was performed to analyze 213 patients with bladder cancer who underwent surgical treatment from January 2013 to December 2019 at the Affiliated Tumor Hospital of Guangxi Medical University. Baseline characteristics and recurrence-free survival (RFS) were statistically compared, and a multivariate analysis was used to identify prognostic factors. Results Compared with preoperative NLR levels, postoperative decreased NLR in 130 patients and postoperative increased NLR in 83 patients were detected. The 1-, 3- and 5-year RFS rates were 88.0%, 75.4% and 75.4% in the decreased postoperative NLR group, respectively, and 51.2%, 25.8% and 16.1% in the increased postoperative NLR group, respectively (P < 0.05). Kaplan-Meier curves showed that the cumulative DFS rate in the increased group was significantly lower than that in the decreased group (P < 0.05). The preoperative NLR showed significant difference with postoperative NLR in the total cohort, high-grade non-muscle-invasive bladder cancer (HG-NMIBC) and muscle-invasive bladder cancer (MIBC) group, while there was no significant difference between postoperative NLR and NLR of recurrence or last follow-up. Multivariate analysis suggested that postoperative-preoperative NLR was an independent predictor for RFS (HR=6.206, 95% CI: 3.826-10.067, P < 0.001) in the total cohort, RFS (HR=9.373, 95% CI: 2.724-32.245, P < 0.001) in the LG-NMIBC group, RFS rates (HR=6.873, 95% CI: 2.486-18.999, P < 0.001) in the HG-NMIBC group and RFS rates (HR=6.109, 95% CI: 2.847-13.109, P < 0.001) in the MIBC group. Conclusion The dynamic change of postoperative NLR is a potential marker for the early detection of bladder cancer recurrence. Patients with increased NLR after surgery tend to have higher risk of recurrence.