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BRAF mutation in endometrial carcinoma and hyperplasia: correlation with KRAS and p53 mutations and mismatch repair

Yu-Zhen Feng1, Tanri Shiozawa, Tsutomu Miyamoto

  • 1Department of Obstetrics and Gynecology, Shinshu University School of Medicine, Asahi, Matsumoto, Japan.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|September 8, 2005
PubMed
Abstract

Insights

BRAF gene mutations are present in endometrial carcinoma and atypical hyperplasia, suggesting a role in endometrial malignant transformation. These BRAF mutations were associated with abnormal mismatch repair function.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Endometrial carcinoma harbors various genetic abnormalities, but a complete understanding remains elusive.
  • The BRAF gene, a key effector in the mitogen-activated protein kinase pathway, is frequently mutated in other cancers.
  • The prevalence and significance of BRAF mutations in endometrial carcinoma require further investigation.

Purpose of the Study:

  • To investigate the prevalence and significance of BRAF gene mutations in endometrial carcinoma.
  • To explore the association between BRAF mutations and other genetic alterations (KRAS, p53) and protein expression (hMLH1, hMSH2) in endometrial lesions.

Main Methods:

  • Direct sequencing was used to analyze BRAF mutations in exons 11 and 15 in 97 endometrial carcinomas, 9 atypical hyperplasias, and 20 normal endometrium samples.
  • Mutations in KRAS and p53, along with immunohistochemical expression of hMLH1 and hMSH2, were also assessed.
  • Statistical analysis was performed to determine the significance of BRAF mutations in relation to clinicopathological features and molecular markers.

Main Results:

  • BRAF mutations were identified in 21% of endometrial carcinomas and 11% of atypical hyperplasias, with many occurring at novel sites.
  • No BRAF mutations were detected in normal endometrial tissues.
  • BRAF mutations showed a significant association with hMLH1-negative cases, indicating a link to abnormal mismatch repair.
  • KRAS and p53 mutations were found in 19% and 23% of cases, respectively.

Conclusions:

  • Mutations in the BRAF gene play a role in the malignant transformation of the endometrium.
  • The findings suggest a potential link between BRAF mutations and defective mismatch repair pathways in endometrial cancer development.

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