Introduction:The peritumoral inflammatory reaction has a substantial importance in the oncologic outcome of bladder cancer (BC). One biomarker proven to be practical and accessible is the NLR (neutrophil-to-lymphocyte ratio) for high risk non-muscle invasive bladder cancer (NMIBC). The aim of the study was to investigate the role of NLR as a prognostic biomarker for disease recurrence, progression and survival of p Ta (pathological assesment of the primary tumor) NMIBC. Material and Methods: In our retrospective study we included 54 patients with pTa NMIBC from a total of 235 patients who underwent transurethral resection of bladder tumor (TURBT) during two consecutive years: January 2007 -December 2008]. Criteria for inclusion were: primary tumor, low-grade, with NLR available at 2 weeks prior to TURBT. NLR was considered altered if higher than 3. Results: The median age of the patients included was 63 years ). Most of the patients had NLR<3 (37 patients). Median EORTC (European Organization of Research and Treatment of Cancer) Recurrence Score was 4 (IQR 1-6), while EORTC Progression Score was 3 (IQR 0-6), respectively. Recurrence occurred in 8 out of 54 (14.81 %) patients and progression was identified in 2 out of 54 (3.70 %) patients with muscle-invasive BC during follow-up. NLR>3 was not associated with clinical and pathological factors. In multivariable Cox regression analyses NLR as a continuous variable was an independent predictive factor for recurrence. Recurrence-free survival (RFS) Kaplan-Meier analysis did not show a statistical significance between NLR groups: 82.67% vs. 64.12%, p=0.26. Kaplan-Meier analysis showed a lower Progression-free survival (PFS) in the NLR>3 group: 94.12% vs. 100%, p=0.04. During follow-up (106 months) 18 patients deceased with