title: Clinicopathological significance and survival influence of p53 protein expression in gastric carcinoma.
abstract: OBJECTIVE
  Mutations in the gene coding for p53 protein are among the most frequent genetic alterations observed in human cancers. The relevance and biological significance of p53 expression in gastric carcinoma are far from being fully established. The aim of our study was to evaluate the influence of p53 detected by immunohistochemistry in the clinicopathological behaviour of a series of gastric carcinoma cases.
  
  
  RESULTS
  Samples from 163 patients treated by gastric resection for gastric carcinoma between 1988 and 1995 were used. Surgical specimens were evaluated for the presence of p53 protein detected by immunohistochemistry with a monoclonal antibody. Cases were classified as positive or negative for p53. Several clinicopathological parameters and c-erb B-2 expression were analysed in the same series and compared with the expression of p53. Cumulative survival was evaluated using univariate analysis and Cox model regression. p53 expression was identified in 41 carcinomas (25.2%) and was significantly associated with venous invasion (P = 0.049), lymph node metastases (P = 0.01) and c-erb B-2 expression (P = 0.003). All the parameters except gender, tumour size and Laurén's classification influenced survival on univariate analysis. p53 expression correlated with overall survival (P = 0.006) and survival in the subgroup of patients with intestinal type carcinoma (P = 0.04). In the subgroup of patients with carcinomas not expressing c-erb B-2, p53 expression significantly influenced cumulative survival (P = 0.02).
  
  
  CONCLUSIONS
  p53 expression is associated with the aggressive biological behaviour of gastric carcinomas and is related to cumulative survival.
authors.affiliation: Surgery B, Hospital S. João and Medical Faculty of the University of Porto, and Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP) and Medical Faculty of the University of Porto, Porto, Portugal. japs@med.up.pt
authors.forename: J
authors.initials: J
authors.lastname: Pinto-de-Sousa
authors.forename: F
authors.initials: F
authors.lastname: Silva
authors.forename: L
authors.initials: L
authors.lastname: David
authors.forename: D
authors.initials: D
authors.lastname: Leitão
authors.forename: M
authors.initials: M
authors.lastname: Seixas
authors.forename: A
authors.initials: A
authors.lastname: Pimenta
authors.forename: M
authors.initials: M
authors.lastname: Cardoso-de-Oliveira
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002277:Carcinoma / Q000175:diagnosis / Q000378:metabolism* / Q000503:physiopathology; D006801:Humans; D007150:Immunohistochemistry; D008875:Middle Aged; D011379:Prognosis; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000378:metabolism; D013274:Stomach Neoplasms / Q000175:diagnosis / Q000378:metabolism* / Q000503:physiopathology; D013534:Survival / Q000502:physiology*; D013997:Time Factors; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis / Q000235:genetics*
chemical_list: D018719:Erb-b2 Receptor Tyrosine Kinases; D016159:Tumor Suppressor Protein p53