RESUMEN
BACKGROUND: Segmentectomy has been widely used for small-sized non-small cell lung cancer (NSCLC). The objective of this study is to determine the impact of number of harvested lymph nodes (LNs) on survival for patients undergoing segmentectomy. METHODS: The clinicopathologic data of patients undergoing segmentectomy for NSCLC from July 2011 to December 2014 were retrospectively analyzed. Survival analysis was performed by Kaplan-Meier method and Cox regression analysis. RESULTS: A total of 259 patients with NSCLC were eligible for analysis. Patients with harvested LN ≥6 had higher frequency of nodal metastasis in pathologic examination (9.4% vs. 1.5%, P=0.005). The 3-year recurrence-free survival (RFS) of patients with harvested LN ≥6 (90.2%) was significantly higher than that of patients with harvested LN <6 (73.7%, log-rank P=0.038). Multivariable Cox analysis identified harvested LN ≥6 as an independent predictor for improved RFS [hazard ratio (HR) =0.35; 95% confidence interval (CI): 0.14-0.90; P=0.029]. There was no significant difference in RFS between patients with harvested LN station ≥3 and <3 (log-rank P=0.34). CONCLUSIONS: The number of harvest LN ≥6 was independently associated with improved RFS for NSCLC patients undergoing segmentectomy, supporting the National Comprehensive Cancer Network (NCCN) guidelines of appropriate LN sampling.