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P53 mutations in gastric carcinomas.

R Seruca1, L David, R Holm

  • 1Department of Pathology, Medical Faculty of Porto, Portugal.

British Journal of Cancer
|May 1, 1992
PubMed
Summary
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p53 gene mutations and protein overexpression were investigated in 30 gastric carcinomas. The study found p53 mutations in three cases, indicating a prevalence similar to other gastric cancer studies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • The p53 tumor suppressor gene plays a critical role in preventing cancer.
  • Alterations in the p53 pathway are common in various malignancies, including gastric cancer.
  • Understanding p53 alterations is crucial for comprehending gastric carcinogenesis.

Purpose of the Study:

  • To evaluate the prevalence of p53 overexpression and 17p allelic loss in gastric carcinomas.
  • To identify p53 gene mutations in gastric cancer cases exhibiting p53 alterations.
  • To compare the frequency of p53 mutations in gastric cancer with other carcinomas.

Main Methods:

  • Immunohistochemical analysis was performed on 30 gastric carcinoma tissue samples to detect p53 protein overexpression.
  • DNA analysis, including microsatellite analysis using the pYNZ22.1 marker, was conducted to assess allelic loss at chromosome 17p.

Related Experiment Videos

  • Constant denaturant gel electrophoresis (CDGE) was employed to detect mutations in the p53 gene in selected cases.

    • Main Results:

    • p53 protein overexpression was observed in 4 out of 30 (13.3%) gastric carcinomas.
    • Allelic loss at 17p, using the pYNZ22.1 marker, was detected in 9 out of 30 (30%) cases.
    • A total of 10 cases (33.3%) showed either p53 overexpression, 17p allelic loss, or both.
    • p53 gene mutations were identified in 3 out of 9 analyzed cases (33.3% of those with alterations), corresponding to 10% of the total cohort.

    Conclusions:

    • The prevalence of p53 mutations in this series of gastric carcinomas is comparable to findings in other gastric cancer studies.
    • The frequency of p53 mutations observed in gastric cancer is lower than that reported for colon carcinomas.
    • These findings contribute to the understanding of the role of p53 alterations in gastric cancer development.