title: Medullary carcinoma of the pancreas in a man with hereditary nonpolyposis colorectal cancer due to a mutation of the MSH2 mismatch repair gene.
abstract: Pancreatic adenocarcinoma has been reported in kindreds with hereditary nonpolyposis colorectal cancer (HNPCC). Medullary carcinoma of the pancreas is a recently described rare variant of pancreatic adenocarcinoma. We describe a man with colorectal carcinoma who subsequently developed pancreatic medullary carcinoma. The tumor displayed microsatellite instability and loss of expression of the mismatch repair proteins MSH2 and MSH6. Mutational analysis of the mismatch repair genes MLH1 and MSH2 demonstrated a pathogenic nonsense mutation within the MSH2 gene, which is consistent with a diagnosis of HNPCC. This report adds support to an association between HNPCC and pancreatic adenocarcinoma displaying the medullary phenotype, suggesting that medullary features in a pancreatic carcinoma may point toward a genetic cancer predisposition. To our knowledge, this is the first reported case of medullary carcinoma of the pancreas in a patient with HNPCC due to a mutation of the MSH2 gene.
authors.affiliation: Centre for Colorectal Disease, St Vincent's University Hospital, Dublin, Ireland. niamhbanville@yahoo.ie
authors.forename: Niamh
authors.initials: N
authors.lastname: Banville
authors.forename: Robert
authors.initials: R
authors.lastname: Geraghty
authors.forename: Edward
authors.initials: E
authors.lastname: Fox
authors.forename: Dermot T
authors.initials: DT
authors.lastname: Leahy
authors.forename: Andrew
authors.initials: A
authors.lastname: Green
authors.forename: Denise
authors.initials: D
authors.lastname: Keegan
authors.forename: Justin
authors.initials: J
authors.lastname: Geoghegan
authors.forename: Diarmuid
authors.initials: D
authors.lastname: O'Donoghue
authors.forename: John
authors.initials: J
authors.lastname: Hyland
authors.forename: Kieran
authors.initials: K
authors.lastname: Sheahan
mesh_terms: D018276:Carcinoma, Medullary / Q000235:genetics / Q000473:pathology*; D003123:Colorectal Neoplasms, Hereditary Nonpolyposis / Q000150:complications / Q000235:genetics*; D018095:Germ-Line Mutation; D006801:Humans; D008297:Male; D008875:Middle Aged; D051718:MutS Homolog 2 Protein / Q000235:genetics*; D010190:Pancreatic Neoplasms / Q000235:genetics / Q000473:pathology*; D010375:Pedigree
chemical_list: C497172:MSH2 protein, human; D051718:MutS Homolog 2 Protein