title: Alteration of p53 clonality accompanying colorectal cancer progression.
abstract: The aim of this study was to clarify whether or not the status of gene alteration is heterogeneous in intramucosal carcinoma and homogeneous within invasive carcinoma. We selected 10 colorectal carcinoma cases (1 mucosal, 5 submucosal and 4 advanced carcinomas including 2 cases with lymph node metastasis) and analyzed the p53 gene sequence. Six colorectal cancers in this study showed heterogeneity in p53 mutations in cells from the intramucosal part. In the invasive part of a carcinoma, p53 mutation status was homogeneous intratumorally in all cases. These data indicate that, in regard to p53 gene alterations, colorectal cancers can be composed of various subclones when limited to the mucosa, but clonal selection occurs when one of these subclones commences invasion to the submucosa, generating a monoclonal invasive carcinoma.
authors.affiliation: First Department of Pathology, Niigata University School of Medicine.
authors.forename: A
authors.initials: A
authors.lastname: Kuwabara
authors.forename: H
authors.initials: H
authors.lastname: Watanabe
authors.forename: Y
authors.initials: Y
authors.lastname: Ajioka
authors.forename: K
authors.initials: K
authors.lastname: Yasuda
authors.forename: H
authors.initials: H
authors.lastname: Saito
authors.forename: K
authors.initials: K
authors.lastname: Matsuda
authors.forename: H
authors.initials: H
authors.lastname: Kijima
authors.forename: K
authors.initials: K
authors.lastname: Hatakeyama
mesh_terms: D000236:Adenoma / Q000235:genetics; D001483:Base Sequence; D002277:Carcinoma / Q000235:genetics; D002999:Clone Cells / Q000473:pathology / Q000502:physiology; D015179:Colorectal Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D016158:Genes, p53; D018740:Genetic Heterogeneity; D006801:Humans; D007413:Intestinal Mucosa / Q000473:pathology / Q000502:physiology*; D009361:Neoplasm Invasiveness / Q000235:genetics*; D017421:Sequence Analysis; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism
chemical_list: D016159:Tumor Suppressor Protein p53