4.4 Article

Trends of Colonic Neoplasia in US Outpatient Endoscopy Centers

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DIGESTIVE DISEASES AND SCIENCES
卷 67, 期 10, 页码 4702-4707

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SPRINGER
DOI: 10.1007/s10620-021-07358-8

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Colorectal cancer; Colon polyps; Hyperplastic polyp; Time trends of colon cancer; Tubular adenoma; Sessile serrated adenoma

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A study found that the occurrence of colorectal cancer is rising in younger patients compared to older patients. The study analyzed a large sample of colonoscopy data and revealed different time patterns between colonic precursor lesions and colorectal cancer, suggesting the presence of specific environmental risk factors for malignant transformation.
Background A variety of studies have shown rising trends in the occurrence of colorectal cancer in younger patients as opposed to falling trends among older patients aged 55 years or more. We hypothesized that the time trends of benign colonic precursor lesions would reveal similar patterns. Aims The present study was designed to test this hypothesis in a large nationwide sample of the US population undergoing colonoscopy in community-based endoscopy centers. Methods The Inform Diagnostics database is an electronic repository of histopathologic records of patients distributed throughout the USA. A cross-sectional study analyzed the detection rates of sessile serrated adenomas (SSA), hyperplastic polyps (HP), tubular adenomas (TA), traditional serrated adenomas (TSA), or adenocarcinomas (colorectal cancer, CRC) in 2,910,174 colonoscopies done 2008-2020. Results During the 13-year time period, the rate of SSA showed a significant rise, both in patients younger and older than 55 years. HP and TA both showed a significant decline during the same time period. The trends of CRC in the older age group decreased significantly between 2008 (or its peak in 2012) and 2020. The trends of CRC in the younger age group increased significantly between 2008 and its peak in 2017. Conclusions The age-specific time trends of benign and malignant colonic neoplasia are characterized by dissimilar temporal patterns. Such dissimilarity could suggest that besides a set of shared risk factors that affect all types of colonic neoplasia alike, there is yet another set of environmental risk factors that specifically influence malignant transformation.

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