| Recruiting | Endoscopic Screening of Asymptomatic Patients for Helicobacter Pylori, Intestinal Metaplasia, and Barrett's Mu NCT07346521 | Sigmund Freud PrivatUniversitat | — |
| Completed | Evaluation of Antral Biopsies Obtained in Normal Esophagogastroduodenoscopy NCT06269380 | Sisli Hamidiye Etfal Training and Research Hospital | N/A |
| Unknown | The Gastric HormonE BioMarkers of Preneoplastic Lesions Study NCT06085677 | Imperial College London | — |
| Unknown | Intestinal Flora and Metabonomics of Appendicitis NCT06035029 | HongyiQu | — |
| Recruiting | The Prevalence, Risk Factors and Optimal Biopsy Protocol of BE NCT05818072 | E-DA Hospital | N/A |
| Terminated | Systems Biology of Gastrointestinal and Related Diseases NCT05579444 | Viome | — |
| Completed | A Study on the Relationship Between Gastric Xanthoma and Gastric Cancer and Precancerous Lesions NCT06282484 | Xijing Hospital of Digestive Diseases | — |
| Unknown | Artificial Intelligence-assisted Confocal Laser Endomicroscopy Identification of Intestinal Metaplasia Severit NCT05462743 | Shandong University | — |
| Completed | Atrophic Gastritis and OLGIM Stage NCT06585553 | Shandong University | — |
| Enrolling By Invitation | UC Davis Cohort of Pre-Malignant and Malignant Gastro-Intestinal DisEases Study NCT05021029 | University of California, Davis | — |
| Recruiting | Prediction of Gastric Cancer in Intestinal Metaplasia and Atrophic Gastritis NCT04840056 | Chinese University of Hong Kong | — |
| Recruiting | SUrveillance of PREMalignant Stomach - Individualized Endoscopic Follow-up NCT04613570 | Instituto Portugues de Oncologia, Francisco Gentil, Porto | N/A |
| Recruiting | Helicobacter Pylori, Atrophic Gastritis and Intestinal Metaplasia Registry and Prospective Study NCT05053945 | Chinese University of Hong Kong | — |
| Completed | Diagnosis of Gastritis, H. Pylori Infection and Atrophic Gastritis in Dyspeptic Patients NCT04296513 | Instituto Ecuatoriano de Enfermedades Digestivas | — |
| Unknown | AG & IM in CA Stomach Protocol NCT04184960 | Chinese University of Hong Kong | — |
| Unknown | Sensitivity of Targeted Biopsy Within Sydney Protocol for GIM NCT04331951 | King Chulalongkorn Memorial Hospital | N/A |
| Suspended | Acetic Acid for the Detection of Esophageal Neoplasms NCT04054713 | Coordinación de Investigación en Salud, Mexico | N/A |
| Completed | Study on the Effect of Bile Reflux on Gastric Cancer and Its Precancerous Lesions: a Cross-sectional Study. NCT03976739 | Xijing Hospital of Digestive Diseases | — |
| Active Not Recruiting | Nitrous Oxide For Endoscopic Ablation of Refractory Barrett's Esophagus (NO FEAR-BE) NCT03554356 | University of North Carolina, Chapel Hill | N/A |
| Unknown | Volatiles in Breath and Headspace Analysis - Diagnostic Markers NCT03228095 | University of Latvia | — |
| Completed | Gastric Cancer Precursor Lesions (GCPL) Study NCT03188406 | National Cancer Institute (NCI) | — |
| Terminated | Helicobacter Pylori Genome Project (HpGP) NCT02788214 | National Cancer Institute (NCI) | — |
| Unknown | Difference of Gastric Microbiota in the Process of Correa's Model. NCT02833363 | Shandong University | — |
| Unknown | Oxidative Stress in Intestinal Metaplasia and Metabolic Syndrome NCT02695186 | General Hospital of Filiates | — |
| Completed | Stratifying Risk in Barrett's Esophagus: A Pilot Study for Biomarker-based Patient Management NCT02075905 | University of North Carolina, Chapel Hill | — |
| Completed | Volatile Markers in Digestive Cancer NCT02332213 | University of Latvia | — |
| Unknown | Association Between Confocal Laser Endomicroscopic (CLE) Features and Gastric Mucosal Microbiome NCT02063932 | Shandong University | — |
| Completed | New Classification of Stomach Using Probe-based Confocal Laser Endomicroscopy NCT01896310 | Shandong University | — |
| Completed | Prevalence of Dysplasia of the Gastric Cardia NCT01787864 | University of North Carolina, Chapel Hill | — |
| Unknown | Artificial Intelligence for Determination of Gastroscopy Surveillance Intervals NCT05631015 | Xiuli Zuo | — |
| Completed | Radiofrequency Ablation for Gastric Metaplasia and Dysplasia NCT01614418 | The University of Hong Kong | Phase 1 / Phase 2 |
| Unknown | Comparison Between Probe-based Confocal Laser Endomicroscopy, White-light Endoscopy and Virtual Chromoendoscop NCT01398579 | National University Hospital, Singapore | Phase 1 |
| Completed | Is the Neosquamous Epithelium "Normal" Following Endoscopic Ablation of Dysplastic Barrett's Esophagus? NCT01373125 | University of North Carolina, Chapel Hill | — |
| Completed | Racial Disparity in Barrett's Esophagus NCT01374074 | University of North Carolina, Chapel Hill | — |
| Completed | Long-term Follow-up Prognosis of Atrophic Gastritis After 3 Years NCT01824953 | Konkuk University Medical Center | — |
| Completed | Confocal Laser Endomicroscopy for the Detection of Gastric Intestinal Metaplasia: a Randomized Controlled Tria NCT01024621 | Shandong University | N/A |
| Unknown | Gastric Cancer Screening Quality Improvement System Establishment NCT02457624 | Seoul National University Hospital | — |
| Completed | Effect of H. Pylori Eradication on the Reversibility of Atrophic Gastritis and Intestinal Metaplasia in Korean NCT02691637 | Seoul National University Bundang Hospital | — |
| Completed | OLGA and OLGIM Stage System for Gastric Cancer NCT03380052 | Seoul National University Bundang Hospital | — |