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Prevalence of tumor BRCA1 and BRCA2 dysfunction in unselected patients with ovarian cancer

Roshni D Kalachand1, Ciaran O'Riain2, Sinead Toomey1

  • 1Medical Oncology Group, Department of Molecular Medicine, Royal College of Surgeons in Ireland, Beaumont Hospital, Dublin, Ireland.

Obstetrics & Gynecology Science
|September 3, 2020
PubMed
Abstract

Insights

Ovarian cancer (OC) patients with BRCA1/2 mutations show improved survival, particularly in high-grade serous types. BRCA1 methylation, however, did not correlate with survival benefits in this study.

Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Poly(ADP-ribose) polymerase (PARP) inhibitors offer therapeutic benefits in ovarian cancer (OC).
  • Evaluating BRCA1/2 gene defects is crucial for understanding OC treatment responses.
  • Tumor BRCA1/2 mutations and BRCA1 methylation patterns are key determinants in OC.

Purpose of the Study:

  • To determine the frequency and characteristics of BRCA1/2 defects in OC.
  • To investigate the association between BRCA1/2 defects and disease parameters.
  • To assess the impact of BRCA1/2 defects on patient survival outcomes.

Main Methods:

  • Analysis of 111 OC tumor specimens for BRCA1/2 mutations and BRCA1 methylation.
  • Examination of BRCA1/2 defect patterns and frequencies.
  • Statistical analysis (Fisher's exact test, Kaplan-Meier) to correlate defects with clinical characteristics and survival (PFI, PFS, OS).

Main Results:

  • A 40% BRCA1/2 dysfunction rate was observed in high-grade serous ovarian cancer (HGSC).
  • BRCA1/2 defects were significantly associated with advanced stage III/IV HGSC.
  • BRCA1/2 mutations correlated with improved overall survival (OS) and trends towards better progression-free survival (PFS) and platinum-free interval (PFI).

Conclusions:

  • High tumor BRCA1/2 dysfunction rates, with a notable prevalence of BRCA2 mutations, are present in HGSC.
  • BRCA1/2 mutations are linked to survival advantages in OC patients.
  • BRCA1 methylation did not demonstrate a significant association with improved survival outcomes in OC.
Keywords:
BRCA1 methylationBRCA1 mutationBRCA2 mutationOvarian cancer

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