Preoperative Neutrophil-to-Lymphocyte Ratio may Predict Postoperative Pneumonia in Stage I–III Gastric Cancer Patients After Curative Gastrectomy: A Retrospective Study

Background Several studies have demonstrated that diverse systemic inflammatory-based prognostic parameters predict a poor prognosis in patients with gastric cancer. However, few studies have focused on the relationships between postoperative complications and systemic inflammatory-based prognostic parameters after curative gastrectomy. We investigated the relationships between postoperative complications and these parameters and assessed the clinical utility of the parameters as predictors of postoperative complications in patients with stage I–III gastric cancer. Methods We retrospectively reviewed 300 patients who underwent curative gastrectomy for stage I–III gastric cancer. All postoperative complications were classified as infectious or noninfectious. We evaluated the relationships between postoperative complications and clinical factors, including systemic inflammatory-based prognostic parameters. Results In total, 101 patients (33.7%) had postoperative Clavien–Dindo grade II–IV complications, and 54 (18.0%) patients developed infectious complications including pancreatic fistula, pneumonia, anastomotic leak, intra-abdominal abscess, and cholecystitis. The relationships between postoperative complications and systemic inflammatory-based prognostic parameters were evaluated by the areas under the receiver operating characteristic curves. Postoperative pneumonia was identified as the most sensitive complication to the systemic inflammatory-based prognostic parameters. Multivariate analysis revealed that preoperative neutrophil-to-lymphocyte ratio (odds ratio, 14.621; 95% confidence interval, 1.160–184.348; p = 0.038) was an independent predictor of pneumonia. Conclusions Preoperative neutrophil-to-lymphocyte ratio may be a useful predictor of postoperative pneumonia in patients with stage I–III gastric cancer after curative gastrectomy.