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Globally, the incidence of esophago-gastric junction (EGJ) cancer is rapidly increasing. However, the proposed strategies for the treatment of these types of cancer are so diverse that there is no established consensus on the optimal treatment. The aim of the present study was to identify independent prognostic factors to delineate the optimal strategies for the treatment of EGJ cancer. The medical records of 150 patients with EGJ cancer who underwent curative surgery at the Kitasato University were retrospectively reviewed. The median follow-up period was 48 months. The patients with tumors that were classified as post-treatment primary tumor stage 3 [(y)pT3] or higher had a 5-year disease-specific survival (DSS) rate of 53%, whereas those with tumors that were classified as (y)pT0-2 had a 5-year DSS rate of 90%. Therefore, prognostic analysis was restricted to those tumors that were designated (y)pT3 or higher. A multivariate Cox's proportional hazards model identified the following independent prognostic factors that negatively influenced the DSS: i) Presence of tumors classified as post-treatment regional lymph node stage 1-3 [(y)pN1-3] [hazard ratio (HR), 3.62; 95% confidence interval (CI), 1.39-12.36]; ii) not undergoing treatment with splenectomy (HR, 2.40; 95% CI, 1.15-5.15); and iii) undergoing treatment with thoracotomy (HR, 2.07; 95% CI, 1.02-4.23). In patients with (y)pN0 tumors, the DSS rate was significantly improved for those who underwent splenectomy than for those who did not (P=0.024). In patients with (y)pN1-3 tumors, the DSS rate was significantly worse for those who underwent thoracotomy compared with those who did not (P=0.004). Splenectomy and thoracotomy may critically affect prognosis in locally advanced EGJ cancer that are classified as (y)pN0 and (y)pN1-3, respectively. Surgical treatments require optimization in order to improve prognoses in advanced EGJ cancer.

Prognoses of advanced esophago‑gastric junction cancer may be modified by thoracotomy and splenectomy