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Neutrophil-to-lymphocyte ratio as a detection marker of tumor recurrence in patients with muscle-invasive bladder cancer after radical cystectomy.

PURPOSE: High-neutrophil to lymphocyte ratio (NLR) values have been shown to be associated with a poor prognosis in many human malignant tumors. We evaluated the correlation of the NLR with other variables in patients with muscle-invasive bladder cancer after radical cystectomy (RC); in particular, we evaluated chronological changes in the postoperative NLR.

METHODS: We included the data from a total of 110 patients who underwent RC for muscle-invasive bladder cancer. The NLR was calculated using complete blood counts determined before RC. Kaplan-Meier and Cox proportional regression analyses of recurrence-free survival (RFS), cancer-specific survival (CSS), and overall survival (OS) were performed to identify significant prognostic variables.

RESULTS: The median patient age was 72 years (41-91 years). In univariate analysis, the pretreatment NLR (≥2.6 vs.<2.6) was associated with RFS (hazard ratio [HR] = 2.41, P = 0.008), CSS (HR = 2.89, P = 0.006), and OS (HR = 2.73, P = 0.002). In multivariate analysis, an NLR≥2.6 and an infiltrative growth pattern at the tumor invasion front were significantly associated with RFS (HR = 2.61, P = 0.023), CSS (HR = 2.58, P = 0.08), and OS (HR = 2.77, P = 0.004). Postoperative chronological analysis revealed that the NLR of 68 patients without recurrence remained low during follow-up, whereas the NLR of the remaining 42 patients with recurrence increased significantly in the last visit before recurrence was detected radiographically (P< 0.01).

CONCLUSIONS: The NLR and tumor growth pattern were strong predictors of prognosis for patients undergoing RC. Our results suggest that an increase in the NLR during follow-up after RC is a potential marker for the early detection of recurrence.

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