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Pathological Diagnosis of Sessile Serrated Lesions with Dysplasia and Their Molecular Alterations Tamotsu Sugai 1 , Noriyuki Uesugi 1 1Department of Molecular Diagnostic Pathology, Iwate Medical University School of Medicine, Iwate, Japan Keyword: 鋸歯状病変 , SSL , SSLD , MLH1 , MSI pp.121-128
Published Date 2023/2/25
DOI https://doi.org/10.11477/mf.1403203107

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  • Abstract
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 A SSLD(sessile serrated lesion with dysplasia)has been well-known as a precursor lesion of CRC(colorectal carcinoma)with MSI(microsatellite instability)phenotype(MSI positive CRC). Recent studies have suggested several histological classifications of SSLD. Among the classifications, two representative classifications have been proposed as useful classifications. Liu et al. revealed that SSLD can be classified into four histological types, namely, minimal deviation dysplasia, serrated dysplasia, adenomatous dysplasia, and dysplasia not otherwise specified. Conversely, Cenaj et al. reported that SSLD could be classified into intestinal and serrated dysplasia. According to the World Health Organization classification, hypermucinous change is added in addition to Canaj's classification. However, separate classification into carcinoma and noncarcinoma types may be favorable in Japanese pathologists, given that Japanese pathologists can diagnose intramucosal carcinoma. A recent study showed that the mismatch repair status separates these lesions into distinct clinicopathological subgroups although WNT activation and p16 silencing are common to both. However, TP53 mutation is only commonly observed in patients with mismatch repair-procient. Collectively, the malignant progression of SSLs occurs by combining MLH1 and CDKN2A silencing, WNT pathway activation, and TP53 mutation.


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電子版ISSN 1882-1219 印刷版ISSN 0536-2180 医学書院

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