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Clinicopathological Findings and Molecular Alterations of Poorly Differentiated Adenocarcinomas of the Colon Tamotsu Sugai 1 , Noriyuki Uesugi 1 , Wataru Habano 2 , Yasuhiro Konishi 1 , Yoshiharu Mue 1 , Masamichi Suzuki 1 , Kouki Ohtsuka 3 , Go Wakabayashi 3 , Toshimi Chiba 4 , Kazuyuki Suzuki 4 1Division of Molecular Diagnostic Pathology, Department of Pathology School of Medicine, Iwate Medical University, Morioka, Japan 2Department of Pharmacodynamics and Molecular Genetics, School of Pharmacy, Iwate Medical University, Morioka, Japan 3Department of Surgery, School of Medicine, Iwate Medical University, Morioka, Japan 4Division of Gastroenterology and Hepatology, Department of Internal Medicine, School of Medicine, Iwate Medical University, Morioka, Japan Keyword: 大腸低分化腺癌 , MSI , メチル化 , 粘液形質 , Ki-ras , BRAF pp.1734-1748
Published Date 2010/10/25
DOI https://doi.org/10.11477/mf.1403102036
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 We studied 42 sporadic PDAs(poorly differentiated adenocarcinomas)and compared them with 57 DTAs(differentiated-type adenocarcinomas). In the present study, PDAs were classified into three types of LSSN(large-sized solid nest), SSN(small-sized solid nest)and trabecular types. Potential clinicopathologic and molecular differences between the study groups were assessed. Differentiated area was often found in PDAs. Lymphatic invasion was significantly more common in the PDAs than in DTAs. p53 overespression of PDAs was similar to DTA groups. Although frequency of Ki-ras mutation in PDAs was lower than that of DTAs, BRAF mutation was frequently detected in PDAs. LSSN had high frequency MSI phenotype, compared with DTAs. Colorectal poorly differentiated adenocarcinoma seems to be a distinct clinicopathologic variant of CRC.


Copyright © 2010, Igaku-Shoin Ltd. All rights reserved.

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

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