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Methylation profiles of multiple CpG island loci in extrahepatic cholangiocarcinoma versus those of intrahepatic cholangiocarcinomas

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Authors
Kim, Baek-Hee; Cho, Nam-Yun; Choi, Minhee; Lee, Sun; Jang, Ja June; Kang, Gyeong Hoon
Issue Date
2007-06-07
Publisher
College of American Pathologists
Citation
Arch Pathol Lab Med. 2007;131(6):923-930.
Keywords
Aged, 80 and overBile Duct Neoplasms/*genetics/metabolism/pathology*Bile Ducts, Extrahepatic*Bile Ducts, IntrahepaticCholangiocarcinoma/*genetics/metabolism/pathologyCpG Islands/*genetics*DNA MethylationDNA, Neoplasm/analysisPolymerase Chain ReactionSequence Analysis, DNA
Abstract
CONTEXT: CpG island hypermethylation is attracting attention because of its importance as a tumor marker and its potential mechanism for the development of human cancers. Extrahepatic cholangiocarcinoma has been poorly investigated with respect to CpG island hypermethylation, and the number of genes known to be methylated in extrahepatic cholangiocarcinomas is fewer than 20. OBJECTIVE: To generate methylation profiles of 24 CpG island loci in extrahepatic cholangiocarcinomas, to correlate methylation findings with clinicopathologic findings, and to compare these findings with those of intrahepatic cholangiocarcinomas. DESIGN: Sixty-three extrahepatic cholangiocarcinomas and 48 intrahepatic cholangiocarcinomas were investigated for hypermethylation in 24 CpG island loci by using methylation-specific polymerase chain reaction. RESULTS: A total of 61 (96.8%) of 63 extrahepatic cholangiocarcinomas showed hypermethylation in at least one of the examined loci, and a high methylation frequency was seen in HOXA1 (95.2%), HPP1 (69.8%), and NEUROG1 (61.9%). The number of methylated CpG island loci was greater in extrahepatic cholangiocarcinomas with nodal metastasis than in those without nodal metastasis (P = .047), and hypermethylation of TIG1 was closely associated with nodal metastasis of extrahepatic cholangiocarcinomas (P = .007). CDH1 and NEUROG1 were more frequently methylated in extrahepatic cholangiocarcinoma than in intrahepatic cholangiocarcinoma, whereas CHFR, GSTP1, IGF2, MGMT, MINT31, p14, and RBP1 were more frequently methylated in intrahepatic cholangiocarcinoma: the differences was statistically significant (P < .05). CONCLUSIONS: A close relationship exists between CpG island hypermethylation and nodal metastasis of extrahepatic cholangiocarcinomas. Methylation profiles of extrahepatic cholangiocarcinomas are somewhat similar to but distinct from those of intrahepatic cholangiocarcinomas.
ISSN
1543-2165 (Electronic)
Language
English
URI
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=17550320

http://hdl.handle.net/10371/10018
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College of Medicine/School of Medicine (의과대학/대학원)Pathology (병리학전공)Journal Papers (저널논문_병리학전공)
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