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Clinicopathological Findings and Molecular Alterations Based on the Location of Colorectal Serrated Lesions Makoto Eizuka 1 , Tamotsu Sugai 1 , Noriyuki Arakawa 1 , Yayoi Takahashi 1 , Ryo Sugimoto 1 , Keisuke Kawasaki 2 , Shunichi Yanai 2 , Shotaro Nakamura 2 , Hiro-o Matsushita 3 , Hiro-o Yamano 3 , Eiichiro Yamamoto 4 , Hiromu Suzuki 4 , Takayuki Matsumoto 2 1Division of Molecular Diagnostic Pathology, Department of Pathology School of Medicine, Iwate Medical University, Morioka, Japan 2Division of Gastroenterology, Department of Internal Medicine, Iwate Medical University, Morioka, Japan 3Department of Gastroenterology, Akita Red Cross Hospital, Akita, Japan 4Department of Molecular Biology, Sapporo Medical University, Sapporo, Japan Keyword: 過形成性ポリープ , SSA/P , 左右差 , 粘液形質 , CIMP pp.1709-1722
Published Date 2015/12/25
DOI https://doi.org/10.11477/mf.1403200495
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 We examined the clinicopathological findings and molecular alterations of HP(hyperplastic polyps)and SSA/P(sessile serrated adenoma/polyps)based on tumor location(left-sided and right-sided). Histological examination was based on the following findings:1. crypt dilatation, 2. irregular branching, and 3. abnormal histological architecture at the crypt base. The specimens were analyzed with PCR pyrosequencing to detect gene mutations(KRAS and BRAF)and methylation status(high methylation epigenome[HME], intermediate epigenome[IME], and low methylation epigenome[LME]). In addition, the expression levels of MUC2, MUC5AC, MUC6, CD10, CDX-2, p53, MLH-1, MSH-2, MSH-6, PMS-2, and ANNEXIN A10 were examined using immunohistochemistry. Although there was no difference in the frequency of histological findings between left- and right-sided tumors, there was a significant difference between them in the frequency of abnormal histological architecture at the crypt base. The expression of MUC6 and ANNEXIN A10 was frequently found in right-sided SSA/P compared with in left-sided SSA/P. BRAF mutation was common in left- and right-sided SSA/P. The frequency of HME was significantly higher in right-sided SSA/P, whereas the frequencies of IME and LME were significantly higher in left-sided SSA/P. Finally, there were no histological or molecular differences between left- and right-sided HP, with the exception of the KRAS mutation. Our data confirm that pathological findings of and molecular pathways to colorectal SSA/P differ in the left and right sides of the bowel.


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

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