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Molecular Alterations of Colorectal Cancers and Its Surrounding Normal Mucosa According to the Tumor Location Tamotsu Sugai 1 , Wataru Habano 2 , Masakazu Yoshida 1,3 , Ryo Sugimoto 1 , Hiroyuki Nozaka 1 , Kazuyuki Ishida 1 , Hiro-o Yamano 4 , Eiichiro Yamamoto 5 , Hiromu Suzuki 5 , Kouki Otsuka 3 , Go Wakabayashi 3 , Kazuyuki Suzuki 6 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 4Department of Gastroenterology, Akita Red Cross Hospital, Akita, Japan 5Department of Biochemistry, School of Medicine, Sapporo Medical University, Sapporo, Japan 6Division of Gastroenterology and Hepatology, Department of Internal Medicine, School of Medicine, Iwata Medical University, Morioka, Japan Keyword: 右側型癌 , MSI , DNAメチル化 , BRAF , CIMP pp.1935-1946
Published Date 2012/12/25
DOI https://doi.org/10.11477/mf.1403113673

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 Previous study has suggested that the molecular mechanism differs depending on the site of occurrence(left-sided or right-sided of colorectum)in colorectal cancers. We examined molecular abnormality in cancer and its surrounding mucosa for each site of occurrence using the crypt isolation method. Isolated glands were collected from cancer(203cases)and its background mucosa(80cases)in colorectal cancers(left side : 133cases, right side : 70cases). We examined mutations(p53, K-ras, BRAF), LOH(loss of heterozygosity, 1p, 5q, 17p, 18q, 22q)and methylations(SFRP1, SFRP2, SFRP5, DKK2, DKK3, mir34b/c, RASSF1A, IGFBP7, p16, MLH1). In tumor glands, p53 mutation was observed predominantly on the left-sided cancers whereas mutation of BRAF was observed on the right-sided cancers. In addition, LOH-high status was significantly higher in left-sided cancers than in right-sided cancers, On the other hand, methylation frequencies of DKK3, RASSF1A and MLH1 were higher on the right-sided cancers. Methylation-high status was more frequently found in right-sided cancers compared with left-sided cancers. MSI-positive status was preferentially found in right-sided cancers. Methylation of normal gland on background mucosa was relatively higher in SFRP1 and SFRP2. Our data confirm that distinct molecular pathways to colorectal cancer dominate in the left and right sides of the bowel. An increase in methylation rate was observed for certain genes in normal glands.


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

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