Staging and outcome depending on surgical treatment in adenocarcinomas of the oesophagogastric junction

Abstract

Abstract Background Owing to controversial staging and classification of adenocarcinoma of the oesophago-gastric junction (AOG) before surgery, the choice of appropriate surgical approach remains problematic. In a retrospective study, preoperative staging of AOG and the impact of preoperative misclassification on outcome were analysed. Methods Data from patients with AOG were analysed from a prospectively collected database with regard to surgical treatment, preoperative and postoperative staging, and outcome. Results One-hundred and thirty patients with Siewert types I and II AOG who did not have neoadjuvant treatment were included in the study: 41 patients with an AOG type I who underwent oesophagectomy, 51 patients with an AOG staged before surgery as type I who underwent oesophagectomy but in whom the final histology showed a type II tumour, and 38 patients whose tumours were staged as AOG type II before and after operation who underwent gastrectomy. Among patients who had an oesophagectomy, lymph node metastases (P = 0·022), tumour relapse (P = 0·009) and recurrent distant metastases (P = 0·028) were significantly more frequent in patients with AOG type II; those with AOG type II had shorter overall survival than those with type I tumours (P = 0·024). Among those with AOG type II, recurrence-free survival was significantly shorter after oesophagectomy compared with extended gastrectomy (P = 0·019). Thoracoabdominal oesophagectomy had a favourable influence on outcome compared with the transhiatal approach. Conclusion Accurate preoperative staging of AOG and appropriate surgical therapy are crucial for outcome. AOG type II is a more aggressive tumour with higher recurrence rates than AOG type I. These patients therefore benefit from more radical surgical treatment.