title: Allelic loss involving the tumor suppressor genes APC and MCC and expression of the APC protein in the development of dysplasia and carcinoma in Barrett esophagus.
abstract: Samples of Barrett metaplastic specialized epithelium (SE), low-grade dysplasia (LGD), high-grade dysplasia (HGD), and invasive adenocarcinoma (CA) derived from 36 esophagectomy specimens were studied for loss of heterozygosity (LOH) in APC and MCC and for expression of APC protein. Of 18 cases that were heterozygous (informative) for APC, LOH was found in none of 14 SE samples, 2 of 8 LGD samples, 3 of 11 HGD samples, and 5 of 17 CA samples. Immunohistochemically, markedly reduced expression of APC protein (< 50% positive cells) was found in 3 of 19 HGD samples and 4 of 35 CA samples but not in SE or LGD samples. Of 17 cases informative for the MCC gene, LOH was detectable in 1 of 14 SE samples, none of 7 LGD samples, none of 9 HGD samples, and 4 of 16 CA samples. Allelic loss of APC and/or loss of APC protein expression occurs earlier in the metaplasia-dysplasia-carcinoma sequence in Barrett esophagus than LOH in the MCC gene. The determination of alterations at APC or MCC would be of limited importance for the surveillance of patients with Barrett esophagus.
authors.affiliation: Dept of Pathology, Heinrich-Heine-University, Moorenstrasse 5, 40225 Düsseldorf, Germany.
authors.forename: N
authors.initials: N
authors.lastname: Bektas
authors.forename: A
authors.initials: A
authors.lastname: Donner
authors.forename: C
authors.initials: C
authors.lastname: Wirtz
authors.forename: H
authors.initials: H
authors.lastname: Heep
authors.forename: H E
authors.initials: HE
authors.lastname: Gabbert
authors.forename: M
authors.initials: M
authors.lastname: Sarbia
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D025601:Adenomatous Polyposis Coli Protein; D000328:Adult; D000368:Aged; D001471:Barrett Esophagus / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D003598:Cytoskeletal Proteins / Q000378:metabolism; D004938:Esophageal Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D005260:Female; D017491:Genes, APC; D017431:Genes, MCC; D006801:Humans; D007150:Immunohistochemistry; D019656:Loss of Heterozygosity; D008297:Male; D008679:Metaplasia; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D011230:Precancerous Conditions / Q000235:genetics* / Q000378:metabolism / Q000473:pathology
chemical_list: D025601:Adenomatous Polyposis Coli Protein; D003598:Cytoskeletal Proteins