Tumor location is an independent prognostic factor of esophageal adenocarcinoma based on the eighth edition of TNM staging system in Chinese patients

Background: Whether tumor location has any impact on the survival of esophageal adenocarcinoma patients remains unclear. Therefore, we aimed to investigate the prognostic value of tumor location for esophageal adenocarcinoma based on the eighth edition of tumor-node-metastasis (TNM) staging system in Chinese patients for the first time. Methods: We conducted a retrospective analysis of patients undergoing esophagectomy for esophageal adenocarcinoma in our department. We analyzed the data about demography, comorbidity, pathologic findings, surgical approach, adjuvant therapy, and survival time. Tumor location was categorized into two groups: adenocarcinomas at the esophagogastric junction (EGJ) and adenocarcinomas at other sites of the esophagus. Both univariate and multivariate analyses were applied. And propensity-score matched (PSM) analysis was also conducted for comparison. Results: A total of 107 patients from January 2009 to December 2015 were involved in the analysis. The median follow-up time was 60.0 months and the median survival time of all those patients was 41.0 months. In the univariate analysis, adenocarcinomas in the EGJ (P=0.047), early pT stage (P=0.030), and moderate/well differentiation (P=0.022) were significantly correlated with better survival. Moreover, in the multivariate analysis, tumor site [hazard ratio (HR) = 0.536; 95% confidence interval (CI) = 0.300-0.958], pT stage (HR = 0.298; 95% CI = 0.124-0.717), and tumor differentiation (HR = 0.437; 95% CI = 0.238-0.802) were significant independent prognostic factors for overall survival of these esophageal adenocarcinoma patients. After the adjustment by PSM, patients with adenocarcinomas at the EGJ still yielded significantly longer survival than these with adenocarcinomas at other sites of the esophagus (P=0.039). Conclusions: Tumor location was an independent prognostic factor for esophageal adenocarcinoma based on the eighth edition of TNM staging system in Chinese patients. Therefore, different surgical therapeutic modalities may be applied for esophageal adenocarcinoma with different tumor locations.