Objective: This study aims to explore the minimum number of lymph nodes (LNs) necessary for assessing the postoperative staging of adenocarcinoma of esophagogastric junction (AEG).
Methods: We extracted the data of patients from the Surveillance Epidemiology and End Results (SEER) database, who were pathologically diagnosed with AEG between 2000 and 2017. We explored the associations between the number of LNs and overall survival (OS) by univariate and multivariate analyses and determined the proper cutoff value of the number of LNs necessary for accurate postoperative staging.
Results: Of the patients with AEG in the SEER database, 2668 met our inclusion criteria. The total number of regional LNs dissected was found to be significantly associated with survival in analyses stratified by T stage. Univariate and multivariate regression showed that age, grade, positive LNs, number of LNs examined, and T stage were independently associated with OS. For patients with T1-2 tumors, the 5-year survival rate was 58.7%, and patients with more than 11 LNs examined obtained a greater survival benefit. Among patients with T3-4 tumors, the 5-year survival rates were 28.9% and 39.7% for those with 1-16 LNs examined and for those with more than 17 LNs examined, respectively.
Conclusion: To accurately determine the pathological stage of patients with AEG, no less than 11 LNs must be resected for patients with stage T1-2 disease, and no less than 16 LNs must be resected for patients with stage T3-4 disease.
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