title: Chromosomal and microsatellite instability of adenocarcinomas and dysplastic lesions (DALM) in ulcerative colitis.
abstract: Longstanding ulcerative colitis (UC) is associated with a high risk of developing UC-related colonic adenocarcinoma (UCC). These carcinomas originate from nonadenomatous dysplastic regions referred to as dysplasia associated lesion or mass (DALM). We evaluated chromosomal and microsatellite instability (MSI) in 21 DALM/UCCs. Chromosomal instability was determined by high-resolution array comparative genomic hybridization with a 3500-element BAC-PAC array. MSI was assessed with markers BAT25 and BAT26 and by immunohistochemical analysis of mismatch repair genes. Comparative genomic hybridization revealed frequent losses of array clones (>20% of tumors) at chromosome arms 4p, 5q, and 18q, frequent gains of array clones (>20% of tumors) were found at 1q, 5p, 6p, 7p, 7q, 8p, 8q, 11p, 11q, 12q, 14q, 17q, 19q, 20p, and 20q. The pattern of alterations is dominated by gains on 5p and 20q with loss of 4p, all of which were already present in a patient with carcinoma in situ. Immunohistochemical analysis of mismatch repair genes MLH1, PMS2, MSH2, and MSH6 showed negative immunostaining in 1 neoplasm (5%). MSI of BAT25 and BAT26 was seen in 3 tumors (14%) including the neoplasm with aberrant immunostaining. In conclusion, we constructed a genomic profile of DALM/UCC including several novel genetic alterations. Further, we found a low percentage of MSI. Thus, DALM/UCCs display profound chromosomal instability, but this is not associated with concurrent MSI.
authors.affiliation: Department of Gastroenterology and Hepatology, Erasmus Medical Center, Rotterdam, The Netherlands.
authors.forename: Jolanda M
authors.initials: JM
authors.lastname: van Dieren
authors.forename: Josiane C
authors.initials: JC
authors.lastname: Wink
authors.forename: Kees J
authors.initials: KJ
authors.lastname: Vissers
authors.forename: Ronald
authors.initials: R
authors.lastname: van Marion
authors.forename: Monique M C P
authors.initials: MM
authors.lastname: Hoogmans
authors.forename: Winand N M
authors.initials: WN
authors.lastname: Dinjens
authors.forename: W Ruud
authors.initials: WR
authors.lastname: Schouten
authors.forename: Hans J
authors.initials: HJ
authors.lastname: Tanke
authors.forename: Karoly
authors.initials: K
authors.lastname: Szuhai
authors.forename: Ernst J
authors.initials: EJ
authors.lastname: Kuipers
authors.forename: C Janneke
authors.initials: CJ
authors.lastname: van der Woude
authors.forename: Herman
authors.initials: H
authors.lastname: van Dekken
mesh_terms: D000230:Adenocarcinoma / Q000209:etiology / Q000235:genetics / Q000473:pathology*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D043171:Chromosomal Instability; D003093:Colitis, Ulcerative / Q000150:complications / Q000235:genetics / Q000473:pathology*; D003110:Colonic Neoplasms / Q000209:etiology / Q000235:genetics / Q000473:pathology*; D003111:Colonic Polyps / Q000209:etiology / Q000235:genetics / Q000473:pathology*; D053843:DNA Mismatch Repair; D005260:Female; D005500:Follow-Up Studies; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D053842:Microsatellite Instability; D008875:Middle Aged; D009693:Nucleic Acid Hybridization; D020411:Oligonucleotide Array Sequence Analysis