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Identifying optimal surgical approaches should be based on comparing outcomes from well designed trials. Currently, trials report different outcomes, making synthesis of evidence difficult. To address this, the aim of this study was to develop a core outcome set (COS)\u2014a standardized group of outcomes important to key international stakeholders\u2014that should be reported by future trials in this field.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>Stage 1 of the study involved identifying potentially important outcomes from previous trials and a series of patient interviews. Stage 2 involved patients and healthcare professionals prioritizing outcomes using a multilanguage international Delphi survey that informed an international consensus meeting at which the COS was finalized.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>Some 498 outcomes were identified from previously reported trials and patient interviews, and rationalized into 56 items presented in the Delphi survey. A total of 952 patients, surgeons, and nurses enrolled in round 1 of the survey, and 662 (70 per cent) completed round 2. Following the consensus meeting, eight outcomes were included in the COS: disease-free survival, disease-specific survival, surgery-related death, recurrence, completeness of tumour removal, overall quality of life, nutritional effects, and \u2018serious\u2019 adverse events.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusion<\/jats:title>\n                  <jats:p>A COS for surgical trials in gastric cancer has been developed with international patients and healthcare professionals. This is a minimum set of outcomes that is recommended to be used in all future trials in this field to improve trial design and synthesis of evidence.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1093\/bjs\/znab192","type":"journal-article","created":{"date-parts":[[2021,5,25]],"date-time":"2021-05-25T19:12:55Z","timestamp":1621969975000},"page":"1216-1224","source":"Crossref","is-referenced-by-count":22,"title":["Core outcome set for surgical trials in gastric cancer (GASTROS study): international patient and healthcare professional consensus"],"prefix":"10.1093","volume":"108","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5751-1846","authenticated-orcid":false,"given":"B","family":"Alkhaffaf","sequence":"first","affiliation":[{"name":"Department of Oesophago-Gastric Surgery, Salford Royal Hospital, Salford Royal NHS Foundation Trust , Salford, UK"},{"name":"Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of 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