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How Does the Serrated Polyp Pathway Alter CRC Screening and Surveillance?

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Abstract

Screening and surveillance for colorectal cancer (CRC) reduces mortality through the detection of early-stage adenocarcinoma, and more importantly the detection and removal of premalignant polyps. While adenomas have historically been considered the most common and screening-relevant precursor lesions, there is accumulating evidence showing that the serrated pathway is an important contributor to CRC, and a disproportionate contributor to interval or postcolonoscopy CRC, particularly in the proximal colon. The serrated pathway is characterized by mutations in the BRAF gene, high levels of methylation of promoter CpG islands (CIMP-high), and the sessile serrated adenoma/polyp (SSA/P) is the most important precursor lesion. The study of serrated polyps has been complicated by evolving nomenclature, substantial variation among pathologists in the identification of SSA/Ps, high variability in endoscopic detection rates, and uncertainty regarding the relation to synchronous and metachronous colonic neoplasia. This paper presents an overview of the serrated polyp pathway and discusses its clinical implications including its impact on CRC screening.

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Authors and Affiliations

  1. Indiana University School of Medicine, Indianapolis, IN, USA

    Charles J. Kahi

  2. Gastroenterology Section, Roudebush VA Medical Center, 1481 W 10th Street, 111G, Indianapolis, IN, 46202, USA

    Charles J. Kahi

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Kahi, C.J. How Does the Serrated Polyp Pathway Alter CRC Screening and Surveillance?. Dig Dis Sci 60, 773–780 (2015). https://doi.org/10.1007/s10620-014-3449-z

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