Radical Surgery for Advanced Gastric- or GEJ-cancer With Oligometastatic Dissmination to the Liver

Inclusion Criteria: * Age \> 18. * Presence of primary T1-T4N0-N3M1 adenocarcinoma of the stomach or GEJ and max. 30% liver involvement. * Primary tumour resectable, based on imaging workup. * Surgical operable patients with ASA-score36 ≤ III and WHO performance status37 0-1. * Patients eligible for treatment with systemic chemotherapy by FLOT regimen. * Informed consent is obtained. Exclusion Criteria: * Patient with non-resectable cancer. * Direct growth involving adjacent organs, i.e., pancreas, colon, blood vessels or bones. * Other malignant disease diagnosed or treated up to 2 years prior to inclusion, except non-aggressive cancers such as non-melanoma sin cancer. * Altered anatomy of the upper gastrointestinal tract due to previous surgery of the oesophagus, stomach, and duodenum. * BMI ≤ 18 * The patient is unable to understand and/or read the consent form. * Other serious illness or acute infections. * Pregnant or breastfeeding.