1. Northern Oesophagogastric Cancer Unit, Newcastle University NHS Foundation Trust Hospitals, Newcastle upon Tyne, UK
2. Institute of Cellular Medicine, University of Newcastle, Newcastle upon Tyne, UK
3. College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
4. Department of Upper Gastrointestinal Surgery, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
5. Institute of Immunology and Immunotherapy, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
6. Department of Upper Gastrointestinal Surgery, Royal Surrey County Hospital NHS Foundation Trust, Guildford, UK
7. Institute of Cancer and Genomic Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK