GNAS codon 201 mutations are uncommon in intraductal papillary neoplasms of the bile duct

Hanno Matthaei, Jian Wu, Marco Dal Molin, Marija Debeljak, Philipp Lingohr, Nora Katabi, David S. Klimstra, N. Volkan Adsay, James R. Eshleman, Richard D. Schulick, Kenneth W. Kinzler, Bert Vogelstein, Ralph H. Hruban, Anirban Maitra

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Activating point mutations of GNAS at codon 201 have been detected in approximately two thirds of intraductal papillary mucinous neoplasms (IPMNs) of the pancreas. Intraductal papillary neoplasms of the bile ducts (IPNBs) morphologically resemble pancreatic IPMNs. This study sought to assess the mutational status of GNAS at codon 201 in IPNBs. Methods: Thirty-four patients were included. DNA from microdissected IPNBs was subjected to a polymerase chain reaction and ligation method for the detection of GNAS mutations at codon 201 and of KRAS mutations at codon 12. Mutational status was compared with clinical and pathologic data. Results: The IPNBs had a median diameter of 3.5 cm and were located intrahepatically (n= 6), extrahepatically (n= 13), both intra- and extrahepatically (n= 4) or in the gallbladder (intracystic papillary neoplasms, n= 11). Most exhibited pancreatobiliary differentiation (n= 20), high-grade dysplasia (n= 26) and an associated adenocarcinoma (n= 20). Analysis of GNAS codon 201 identified only one mutant sample in a multifocal intestinal subtype intrahepatic IPNB with high-grade dysplasia. Six lesions harboured a KRAS codon 12 mutation. Conclusions: GNAS codon 201 mutations are uncommon in IPNBs, by contrast with pancreatic IPMNs. More comprehensive molecular profiling is needed to uncover the pathways involved in IPNB development.

Original languageEnglish (US)
Pages (from-to)677-683
Number of pages7
JournalHPB
Volume14
Issue number10
DOIs
StatePublished - Oct 2012

ASJC Scopus subject areas

  • Hepatology
  • Gastroenterology

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