title: Novel p53 mutation in a malignant tumor secreting vasoactive intestinal peptide.
abstract: OBJECTIVE
  To assess involvement of p53 mutations in development of pancreatic endocrine tumors.
  
  
  METHODS
  Survey of sporadic pancreatic endocrine tumors.
  
  
  METHODS
  Hospital referral centers, mainly in the Los Angeles, Calif, area.
  
  
  METHODS
  We obtained fresh surgical specimens from 25 patients (convenience sample) with no family history of endocrine tumors and no evidence of multiple endocrine neoplasia 1 or von Hippel-Lindau disease. Preoperative tests included serum peptide analysis.
  
  
  METHODS
  DNA was prepared from tumor specimens. We screened exons 5 through 8 of the p53 gene using single-strand conformation polymorphism analysis, followed by DNA sequencing when a variant was detected.
  
  
  RESULTS
  A three-base deletion mutation (codon 239) was found in one malignant tumor secreting vasoactive intestinal peptide.
  
  
  CONCLUSIONS
  p53 appears to have a limited role in development of pancreatic endocrine tumors. However, evidence from one of our patients suggests it may be involved in tumor progression in uncommon cases.
authors.affiliation: Department of Pediatrics, Harbor-University of California at Los Angeles (UCLA) Medical Center, Torrance 90502, USA.
authors.forename: H J
authors.initials: HJ
authors.lastname: Lin
authors.forename: S W
authors.initials: SW
authors.lastname: French
authors.forename: D
authors.initials: D
authors.lastname: Reichenbach
authors.forename: Y J
authors.initials: YJ
authors.lastname: Wan
authors.forename: E
authors.initials: E
authors.lastname: Passaro
authors.forename: M P
authors.initials: MP
authors.lastname: Sawicki
mesh_terms: D003062:Codon; D004273:DNA, Neoplasm / Q000032:analysis*; D005091:Exons; D016158:Genes, p53 / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009154:Mutation; D010190:Pancreatic Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D016133:Polymerase Chain Reaction; D018807:Polymorphism, Single-Stranded Conformational; D017422:Sequence Analysis, DNA; D014660:Vasoactive Intestinal Peptide / Q000378:metabolism
chemical_list: D003062:Codon; D004273:DNA, Neoplasm; D014660:Vasoactive Intestinal Peptide