293. OUTCOMES AFTER SURGICAL TREATMENT OF OESOPHAGOGASTRIC CANCER WITH SYNCHRONOUS LIVER METASTASES: A MULTICENTRE RETROSPECTIVE COHORT STUDY

Abstract Background Approximately 10-12% of patients with oesophageal and gastric cancer (OGC) present with oli-gometastatic metastases at diagnosis. It remains unclear if there is a role for radical surgery in these patients. We aimed to assess the outcomes of OGC patients who underwent simultaneous treatment for the primary tumour and synchronous liver metastases. Methods Patients with OGC who underwent surgical treatment between 2008 and 2020 for the primary tumour and up to five synchronous liver metastases aiming for complete tumour removal or ablation (i.e. no residual tumour) were identified from four institutional databases. The primary outcome was overall survival (OS), calculated with the Kaplan-Meier method. Secondary outcomes were disease-free survival and postoperative outcomes. Results Thirty-one patients were included with complete fol-low-up data in 30 patients. Twenty-six patients (84%) received neoadjuvant therapy followed by response evaluation. Median OS was 21 months [IQR 9-36] with a 2- and 5-year survival rates of 43% and 30%, respectively. While disease recurred in 80% of the patients (20 of 25 patients) after a radical resection, patients with a solitary liver metastasis had a median OS of 34 months. The number of liver metastases was a prognostic factor for OS (solitary metastasis aHR 0.330; p-value = 0.025). Thirty-day mortality was zero and complications occurred in 55% of the patients. Conclusion Long-term survival can be achieved in well-selected patients who undergo surgical resection of the primary tumour and local treatment of synchronous liver metastases. In particular, patients with a solitary liver metastasis seem to have a favourable prognosis.