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Clinicopathological Findings and Molecular Alterations of Hereditary Non-polyposis Colorectal Cancer─Comparison of Sporadic MSI-high Colorectal Cancer 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: HNPCC , 孤発性MSI-high colorectal cancer , 低分化腺癌 , 腫瘍内リンパ球浸潤 , MSI pp.2065-2078
Published Date 2010/12/25
DOI https://doi.org/10.11477/mf.1403102078

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  • Abstract
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 HNPCC(hereditary non-polyposis colorectal cancer)is one of the representative types of familial CRC(colorectal cancer). HNPCC is characterized by distinctive clinicopathological features and molecular alterations. However, this disease is sometimes missed in routine medical examinations. Pathologic examination of biopsy specimens can help in identification of such unsuspected cases of certain forms of hereditary CRC due to characteristic morphologic findings. The most important of these are tumor proximal location, lymphocytic infiltration, mucin secretion and poor differentiation. These features are apparent in both sporadic MSI-H CRC and CRC occurring in hereditary non-polyposis colorectal cancer. Whereas inactivation of the mismatch repair gene MLH1 due to promoter methylation causes sporadic MSI positive CRC, HNPCC results from a germline mutation in MMR(mismatch repair)genes. In addition, immunohistochemical and molecular studies can then provide a definitive diagnosis. Finally, HNPCC CRC arises almost exclusively within adenomatous precursor lesions, in contrast to sporadic MSI positive CRC where at least half of the cancers develop in serrated polyps. Distinguishing HNPCC from sporadic MSI CRC by clinicopathological and molecular features can be of assistance in the diagnosis of HNPCC.


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

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