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Background and Aims: For young individuals (age <40 years) without strong family histories that would put them at risk for genetic colorectal cancer syndromes, it is unclear if national Multi-Society Task Force surveillance recommendations apply or if endoscopists follow these guideline recommendations when such patients are incidentally found to have adenoma(s) on colonoscopy., Methods: We reviewed records on young (age <40 years) patients, with either no family history or only a moderate family history (1 first-degree family member with colorectal cancer at age ≥50), who were found to have neoplastic polyp(s) on their index colonoscopy. We assessed the pattern of endoscopist surveillance recommendations, whether endoscopist recommendations complied with national guidelines, and compliance with surveillance recommendations., Results: One hundred forty-one subjects were included, of whom 19 (13.5%) had a moderate family history of colorectal cancer. For patients with non-high-risk findings, 27.7% were asked to repeat their colonoscopy in ≤3 years and 99.0% within 5 years. Endoscopist surveillance recommendation compliance rates with national guidelines were >65.0% for low-risk neoplasia but lower for high-risk (40.0%), nonpolypoid (44.2%), and serrated neoplasia (54.2%, P < .001 for all). Subjects whose endoscopist recommendations were noncompliant with guidelines were usually recalled too early (96%). Only 24.7% of subjects were actually compliant with endoscopist surveillance recommendations., Conclusions: For young patients with neoplastic polyp(s) but no strong family history, most endoscopists complied with national guidelines and recommended repeat colonoscopy in 3 to 5 years. However, relatively few patients were compliant with repeat colonoscopy recommendations. For most cases that were noncompliant with guidelines, patients were recalled too early as opposed to too late., (Copyright © 2018 American Society for Gastrointestinal Endoscopy. Published by Elsevier Inc. All rights reserved.)

Background: Colon cancer screening is being introduced in many countries, but standard Western screening approaches may not be appropriate for Asian societies if differences in colon cancer epidemiology exist. Comparative analysis of colorectal neoplasia patterns in South Korean and Western subjects has implications for appropriate screening approaches in non-Western societies., Methods: The results of concurrent screening colonoscopies performed in average-risk patients 50 to 69 years old in 2 teaching hospitals, Kyung Hee University Hospital (Seoul, South Korea) and Virginia Mason Medical Center (Seattle, Wash), were compared with respect to prevalence, histologic features, anatomic distribution, and shape characteristics of colorectal neoplasia., Results: The U.S. (n = 3460) and South Korean (n = 2193) cohorts were similar with regard to the prevalence of adenomas (28.5% vs 29.8%, respectively, P = .312) and advanced neoplasia (6.4% vs 5.4%, respectively, P = .102), but the proportion of proximal adenomas was greater in the U.S. cohort (62.8% vs 45.9%, P < .001). The prevalence of adenomas and advanced neoplasia was similar in male patients, but there was a greater prevalence of neoplasia (23.5% vs 18.8%, P = .006) and advanced neoplasia (5.1% vs 2.7%, P < .001) in U.S. women than South Korean women. When large (≥10 mm) adenomas were considered, proximal location and nonpolypoid (flat) shape were more common in the U.S. cohort (79.4% vs 37.1%, P = .003 and 43.5% vs 12.3%, P < .001, respectively). The overall prevalence of large flat adenomas in the U.S. cohort was 5 times that of the South Korean cohort (2.6% vs 0.5%, P < .001). Adjustment for sex ratio discrepancies (48.3% men in the U.S. cohort vs 60.8% in the South Korean cohort, P < .001) did not result in any significant changes in the conclusions., Conclusion: Compared with Westerners, South Koreans have a more distal distribution of adenomas and advanced neoplasia and lower prevalence of large flat adenomas. South Korean women have a lower prevalence of colorectal neoplasia than Western women. Such disparities suggest that Western screening strategies cannot be directly adopted by other countries, but need to be customized by society., (Copyright © 2015 American Society for Gastrointestinal Endoscopy. Published by Elsevier Inc. All rights reserved.)