Prognostic Importance of Controlling Nutritional Status in Patients Undergoing Curative Thoracoscopic Esophagectomy for Esophageal Cancer

It is now clear that cancer survival is determined not only by tumor pathology but also by host-related factors, in particular, nutritional status and systemic inflammation. It is desirable that the essential properties of any scale designed or intended to be used for the prediction of survival are simple, convenient, and objective. In this study, we retrospectively reviewed the database of patients who underwent curative surgery for esophageal cancer in our department to evaluate controlling nutritional status (CONUT) and neutrophil-lymphocyte ratio (NLR) as predictors of cancer-specific survival (CSS) after esophagectomy. We retrospectively reviewed the database of 148 consecutive patients who underwent potentially curative surgery for histologically verified esophageal squamous cell carcinoma at our institute between January 2002 and December 2014. CONUT and NLR were calculated. On multivariate analysis, pTNM stage (P < 0.0001) and CONUT (P = 0.0291) were independently associated with worse prognosis. Multivariate analysis evaluated the prognostic factors in 2 different patient groups: patients younger than 70 years (nonelderly) and those aged 70 years or more (elderly). Multivariate analysis demonstrated that pTNM stage (P = 0.0083) and CONUT (P = 0.0138) were the independent risk factors for a worse prognosis among the nonelderly group, whereas univariate analysis demonstrated that pTNM stage (P = 0.0002) was the only independent risk factor for a worse prognosis among the elderly group. CONUT was a significant predictor of CSS in patients with esophageal cancer in this study. However, pTNM stage remained a significantly more powerful predictor of CSS. Therefore, the results of this study suggested that CONUT and pTNM stage are the significant and complementary factors predicting survival in patients with esophageal cancer. But, this study failed to confirm the NLR as a significant predictor of CSS after resection for esophageal cancer.