title: Expression of p53 protein as a prognostic factor in patients with gastric cancer.
abstract: The prognostic value of overexpression of the p53-encoded protein was evaluated in 242 patients with gastric cancer. Formalin-fixed paraffin-embedded specimens of gastric adenocarcinomas were stained with the monoclonal antibody DO-7. 95 patients (39%) showed a high level of immunoreactivity (> or = 20% of cell nuclei staining positively), suggesting the presence of a mutation in the TP53 coding sequence. Overexpression of the p53 protein correlated significantly with stage of disease (P = 0.01), the presence of distant metastases (P = 0.04) and with the intestinal type of cancer (P = 0.04). No correlation between p53 overexpression and age, gender or the presence of the lymph node metastases was found. In univariate analysis, p53 immunoreactivity correlated significantly with survival (P = 0.0005). The median survival in the p53 high-level group was 19 months compared with 65 months in the p53 low-level group. In multivariate analyses, stage of disease and the presence of distant metastases emerged as independent prognostic factors, whereas p53 immunoreactivity did not (P = 0.08). The present results indicate that overexpression of the p53 protein is not an independent prognostic factor in patients with gastric cancer.
authors.affiliation: Fourth Department of Surgery, Helsinki University Central Hospital, Finland.
authors.forename: M
authors.initials: M
authors.lastname: Victorzon
authors.forename: S
authors.initials: S
authors.lastname: Nordling
authors.forename: C
authors.initials: C
authors.lastname: Haglund
authors.forename: J
authors.initials: J
authors.lastname: Lundin
authors.forename: P J
authors.initials: PJ
authors.lastname: Roberts
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism* / Q000473:pathology / Q000601:surgery; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000378:metabolism*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000378:metabolism*; D011379:Prognosis; D013274:Stomach Neoplasms / Q000378:metabolism* / Q000473:pathology / Q000601:surgery; D015996:Survival Rate; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*
chemical_list: D014408:Biomarkers, Tumor; D009363:Neoplasm Proteins; D016159:Tumor Suppressor Protein p53