| Summary: | Wandong Hong,1 Lemei Dong,1 Simon Stock,2 Zarrin Basharat,3 Maddalena Zippi,4 Mengtao Zhou5 1Department of Gastroenterology and Hepatology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China, 2Department of Surgery, World Mate Emergency Hospital, Battambang, Cambodia; 3Jamil-ur-Rahman Center for Genome Research, Dr Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, Pakistan; 4Unit of Gastroenterology and Digestive Endoscopy, Sandro Pertini Hospital, Rome, Italy; 5Department of Surgery, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China Background and aim: To investigate the prevalence and characteristics of colonic adenoma and advanced colonic adenoma in a large group of patients in mainland China. Materials and methods: We conducted a cross-sectional study on patients who had undergone colonoscopy examination in a university hospital in mainland China. Colonic adenomas and advanced adenomas were recorded. Results: The prevalence of polyps, adenoma, and advanced adenoma was 23.9%, 13.3%, and 3.5%, respectively. Age and sex were independent risk factors for the prevalence of adenoma and advanced adenoma. Polyp size was associated with an increased risk of both colonic adenoma (OR 1.50, 95% CI 1.44–1.56) and advanced adenoma (OR 2.78, 95% CI 2.55–3.03) after sex and age adjustment. Proximal colon polyps were a risk factor for adenoma (OR 1.41, 95% CI 1.20–1.66) and also associated with a significant reduction (44%) in risk of advanced adenoma (OR 0.56, 95% CI 0.36–0.86) compared to distal colon adenoma after sex and age adjustment. A screening indication was associated with a statistically significant decrease in the odds of prevalence of adenoma (OR 0.90, 95% CI 0.81–0.99) and advanced adenoma (OR 0.72, 95% CI 0.59–0.88) compared to a no-screening indication. Conclusion: The overall prevalence of adenoma was low in mainland China. It exhibited a varied pattern with respect to age and sex. Polyp size was a risk factor for both colonic adenoma and its transition to advanced adenoma. Proximal colon polyps were a risk factor for adenoma, but a protective factor for advanced adenoma compared to distal colon adenoma. Keywords: colonic adenoma, advanced adenoma, colonic polyps, colonoscopy, epidemiology
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