Clinicopathologic and survival differences between adenocarcinoma of the distal oesophagus and gastro-oesophageal junction.

Abstract

The incidence of adenocarcinoma of the distal oesophagus (DO) and gastro-oesophageal junction (GOJ) are increasing. They may represent differing disease processes. This study aimed to assess clinicopathological and survival differences between patients with DO and GOJ adenocarcinomas. Data were extracted from a prospective single-surgeon database of consecutive patients undergoing an open Ivor-Lewis oesophagectomy for oesophageal adenocarcinoma (distal oesophagus, Siewert type I and II). Differences in clinicopathological characteristics and survival were evaluated and prognostic factors examined using univariate and multivariate survival analyses. The data were available for 234 patients who underwent an oesophagectomy between 1992 and 2019. DO tumours had higher rates of Barrett's oesophagus (P < 0.001), presented with lower tumour stage (P=0.02) and were more likely to be associated with fewer lymph nodes resected (P=0.003) than GOJ tumours. The median overall survival for distal oesophageal tumours was 29.2months, while gastro-oesophageal tumours was 38.6months. Kaplan Meier analysis did not show a difference in overall survival between the two groups (P=0.08). However, when adjusted for potential confounders, GOJ tumours were associated with a reduced adjusted hazard of death (adjusted HR 0.58, 95% CI 0.36-0.92, P=0.022) compared with DO tumours. This study suggests that GOJ cancers have different clinicopathological characteristics and improved survival compared to DO tumours.