Usefulness of indigo carmine chromoendoscopy for detecting gastric cancer and gastric adenoma during upper gastrointestinal endoscopy (INDIGO study): protocol for a prospective multicentre observational study

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The INDIGO study aims to evaluate the efficacy of indigo carmine chromoendoscopy for detecting gastric cancer and adenomas during upper GI endoscopy.
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This prospective multicenter observational study will enroll over 1050 patients aged 20 to 95 at high risk for gastric cancer.
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Patients will undergo two-step gastric observation: first with white light imaging, followed by indigo carmine spraying.
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The primary endpoint is the detection rate of gastric cancer or adenomas during the second-pass observation after indigo carmine examination.
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The study has received ethical approval and aims to publish findings in academic conferences and peer-reviewed journals.

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