Neutrophil-lymphocyte ratio in small renal masses.

Introduction. To evaluate the association between preoperative neutrophil-lymphocyte ratio (NLR) and clinicopathologic characteristics in patients with small renal masses (SRM). Methods. Retrospective chart reviews of patients with renal masses ≤4 cm who underwent nephrectomy from January 2007 to July 2012 were conducted. Multivariable linear regression was used to examine the association between preoperative NLR and clinicopathologic variables. Results. In 1001 patients, we noted higher mean preoperative NLR in men (3.0 ± 1.4 versus 2.6 ± 1.3 in women, P < 0.01) and Caucasians (2.9 ± 1.4 versus 1.9 ± 0.9 in African Americans, P < 0.01) but no significant differences in patients with low (I-II) versus high (III-IV) American Society of Anesthesiologists (ASA) scores (2.8 ± 1.4 versus 2.9 ± 1.5, P = 0.18) or benign versus malignant pathology (2.9 ± 1.4 versus 2.8 ± 1.3, P = 0.75). Spearman correlation analysis (ρ) showed preoperative NLR significantly correlated with age (ρ = 0.15, P < 0.01) and preoperative serum creatinine (Crea) [ρ = 0.13, P < 0.01]. On multivariable linear regression analysis older age, male gender, Caucasian race, and preoperative Crea were predictive of higher preoperative NLR, but ASA score and tumor pathology were not. Conclusions. In patients with SRM, we found no association between preoperative NLR and tumor pathology.