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Background . The studies on risk factors and metastatic rate of retropancreatic (number 13) lymph nodes in gastric adenocarcinoma were few and the results were still controversial. The aim of this study was to elucidate risk factors and prognostic significance of number 13 lymph nodes in gastric adenocarcinoma.  Method . From January 2000 to December 2011, 114 patients who underwent gastrectomy with number 13 lymph nodes dissection were enrolled and followed up to January 2014. Patients were grouped according to whether number 13 lymph nodes were positive or negative.  Results . The metastatic rate of number 13 lymph nodes was 22.8%. In multivariate analysis, pT stage ( P  = 0.027), pN stage ( P  = 0.005), and number 11p ( P  = 0.015) lymph nodes were independent risk factors of positive number 13 lymph nodes. In all patients ( P  < 0.001) and subpopulation with TNM III stage ( P  = 0.007), positive number 13 lymph nodes had significantly worse prognosis than those of patients with negative number 13 LNs in Kaplan-Meier analysis.  Conclusion . Number 13 lymph nodes had relatively high metastatic rate and led to poor prognosis. pT stage, pN stage, and number 11p lymph nodes were independent risk factors of positive number 13 lymph nodes.

Risk Factors and Prognostic Significance of Retropancreatic Lymph Nodes in Gastric Adenocarcinoma