title: pS2 expression as a possible diagnostic marker of colorectal carcinoma in ulcerative colitis.
abstract: This study was performed to evaluate the significance of pS2 and MUC1 expressions in ulcerative colitis (UC)-associated colorectal neoplasias. Tissues were collected from 6 patients with UC-associated colorectal neoplasias treated surgically. Specimens were 13 adenocarcinomas, 40 dysplasias (20 high-grade dysplasias, 20 low-grade dysplasias), and 60 normal mucosae. Tissues were also collected from patients without UC treated surgically or endoscopically. pS2, p53, and MUC1 expressions were examined immunohistochemically and compared. The K-ras codon 12 mutation was investigated by single-strand conformation polymorphism analysis. In patients with UC, the incidence of pS2 expression was significantly higher (p<0.01) in adenocarcinomas than it was in dysplasias, and no pS2 expression was seen in normal mucosae. p53 overexpression was detected in 50% (10/20) even in low-grade dysplasias. MUC1 expression was seen only in invasive carcinomas, but it was seen in 100% of cases (3/3). K-ras gene mutations were detected in 2 (20%) of 10 carcinomas. In low and high-grade dysplasias, the incidences of pS2 expression were significantly (p<0.01) lower than the incidences of p53 overexpression, however, in UC-associated carcinomas there was no significant difference; pS2 expression and p53 overexpression were detected in 13 of 13 (100%) cases and in 12 of 13 (92%) cases, respectively. These results suggest that p53 overexpression may be a diagnostic marker of neoplasia, and that pS2 expression may be a diagnostic marker of colorectal carcinoma in case of UC.
authors.affiliation: First Department of Internal Medicine, Hiroshima University School of Medicine, Minami-ku, Hiroshima 734-8551, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Hirota
authors.forename: S
authors.initials: S
authors.lastname: Tanaka
authors.forename: K
authors.initials: K
authors.lastname: Haruma
authors.forename: M
authors.initials: M
authors.lastname: Yoshihara
authors.forename: K
authors.initials: K
authors.lastname: Sumii
authors.forename: G
authors.initials: G
authors.lastname: Kajiyama
authors.forename: F
authors.initials: F
authors.lastname: Shimamoto
authors.forename: N
authors.initials: N
authors.lastname: Kohno
mesh_terms: D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor; D002471:Cell Transformation, Neoplastic; D003093:Colitis, Ulcerative / Q000150:complications* / Q000378:metabolism / Q000473:pathology; D015179:Colorectal Neoplasms / Q000209:etiology* / Q000378:metabolism* / Q000473:pathology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D007413:Intestinal Mucosa / Q000378:metabolism / Q000473:pathology; D008297:Male; D008875:Middle Aged; D014176:Protein Biosynthesis; D011506:Proteins; D000071163:Trefoil Factor-1; D025521:Tumor Suppressor Proteins
chemical_list: D014408:Biomarkers, Tumor; D011506:Proteins; C051838:TFF1 protein, human; D000071163:Trefoil Factor-1; D025521:Tumor Suppressor Proteins