Prognostic significance of neutrophil-to-lymphocyte ratio in middle thoracic esophageal squamous cell carcinoma patients undergoing radical esophagectomy.

BACKGROUND: It is widely accepted that the pretreatment neutrophil-to-lymphocyte ratio (NLR) is an independent predictor of prognosis in multiple malignancies, including esophageal squamous cell carcinoma (ESCC). However, its predictive value in middle thoracic esophageal carcinoma is still unclear. Therefore, the purpose of this study was to investigate the preoperative serum levels of NLR in middle thoracic esophageal carcinoma patients to clarify their clinical significance as predictors of prognosis. METHODS: This study investigated 556 patients with middle thoracic ESCC treated by esophagectomy from January 2010 to December 2012. The prognostic impact of serum NLR level was analyzed. A receiver operating characteristic (ROC) curve was used to identify the NLR for predicting survival. Correlation between the NLR and clinicopathological characteristics was analyzed by χ2 test. Prognostic influence was calculated by using the Kaplan-Meier method and the difference was compared by log-rank test. Cox regression analysis was performed to evaluate the significant prognostic factors. RESULTS: The cutoff value for the NLR was 2.43 ng/mL, the area under the curve was 0.553 (95% CI: 0.504-0.601; P=0.035), and the sensitivity and specificity were 53.3% and 58.7% respectively. It is demonstrated that preoperative NLR (P=0.003), T stage (P<0.001), N stage (P<0.001), surgical approach (P=0.004), and gender (P=0.008) were independent prognostic factors in middle thoracic ESCC by univariate analysis. Multivariate analysis showed that preoperative NLR (P=0.036), T stage (P=0.004), N stage (P<0.001), surgical approach (P=0.002), and age (P=0.019) were independent prognostic factors for survival. CONCLUSIONS: Pretreatment NLR >2.43 ng/mL could serve as an indicator of poor prognosis in middle thoracic ESCC patients after surgical treatment.