title: Allelotype of ampulla of Vater cancer: highly frequent involvement of chromosome 11.
abstract: OBJECTIVE
  To determine the genetic differences/similarities in ampulla of Vater cancers (AVC) with respect to other pancreatic tumor types.
  
  
  METHODS
  We analyzed eight cases of primary AVC by genome-wide allelotyping on DNA obtained from frozen tissue. A total of 372 microsatellite loci were used for each case, for a total of 2,976 microsatellites analyzed.
  
  
  RESULTS
  Of the 2,159 informative markers, 400 were allelic losses and 1,759 markers were retained for an average fractional allelic loss of 0.19. Seven cases showed LOH on at least two markers on chromosomal arm 11p, while six cases showed allelic losses on 11q. The high frequency of LOH on chromosome 11 was also confirmed by analysis of an additional 17 paraffin-embedded AVC. Frequent LOH (50% or greater) was also found on chromosome arms 5q, 6q, 9p, 13, 16p, 17p, and 18p.
  
  
  CONCLUSIONS
  It can be inferred that the targets of inactivation on chromosomes 5q, 9p, and 17p appear to be APC, p16, and p53, respectively, while the critical target(s) of inactivation at the other frequently lost loci remain to be characterized. The resulting allelotype reveals that distinctive chromosomal alterations are present in these neoplasms, indicating that it is a tumor entity distinct from pancreatic adenocarcinoma.
authors.affiliation: Dipartimento di Patologia-Sezione di Anatomia Patologica, Università di Verona, Strada Le Grazie, 37134 Verona, Italy.
authors.forename: Patrick S
authors.initials: PS
authors.lastname: Moore
authors.forename: Edoardo
authors.initials: E
authors.lastname: Missiaglia
authors.forename: Stefania
authors.initials: S
authors.lastname: Beghelli
authors.forename: Emma
authors.initials: E
authors.lastname: Bragantini
authors.forename: Maria M
authors.initials: MM
authors.lastname: Mina
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Zamboni
authors.forename: Massimo
authors.initials: M
authors.lastname: Falconi
authors.forename: Aldo
authors.initials: A
authors.lastname: Scarpa
mesh_terms: D000328:Adult; D000368:Aged; D000483:Alleles; D014670:Ampulla of Vater / Q000473:pathology; D002880:Chromosomes, Human, Pair 11; D003138:Common Bile Duct Neoplasms / Q000235:genetics* / Q000473:pathology; D005260:Female; D006801:Humans; D019656:Loss of Heterozygosity; D008297:Male; D018895:Microsatellite Repeats; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000235:genetics