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Epidemiology of Colorectal Serrated Lesions Yuri ENOMOTO 1 , Shoichi SAITO 1 , Mitsuaki ISHIOKA 1 , Chihiro YASUE 1 , Daisuke IDE 1 , Akiko CHINO 1 , Masahiro IGARASHI 1 1Department of Gastroenterology, Cancer Institute Hospital of the Japanese Foundation for Cancer Research, Tokyo, Japan Keyword: colorectal cancer , serrated lesion , sessile serrated lesion pp.860-862
Published Date 2022/5/25
DOI https://doi.org/10.24479/endo.0000000192
  • Abstract
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 The “serrated neoplastic pathway”, which is a precursor lesion of serrated lesions, has recently been identified as a third carcinogenic pathway in colorectal carcinogenesis with a frequency of 15-20%. Among serrated lesions, sessile serrated lesions (SSL) in particular have been pointed out as a possible precursor of microsatellite instability-high cancer, and tumorigenic SSL is now attracting attention as an indication for aggressive treatment. The “atypical SSL” is called SSL with dysplasia (SSLD), which includes a wide range of components from intramucosal carcinoma to adenoma and highly atypical SSL according to the Japanese histopathological criteria. According to our study, SSL and SSLD were found in 1.7% of polyps detected by colonoscopy, and 3.1% of them were SSLD, which was considered to be almost equivalent to the previously reported percentage of adenoma carcinomas. TSA was found in 0.4% of all polyps and high-grade dysplasia was found in 1.5% of them. In terms of localization, SSA/P is generally considered to be more common in the right hemicolon, bordering the splenic flexure, while HP and TSA are more common in the left colon and rectum, but there are still many unknowns regarding clinicopathological and molecular characteristics and growth development, as well as differences in localization, age at onset and sex. Further studies are expected.


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電子版ISSN 印刷版ISSN 0915-3217 東京医学社

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