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BRCA2 germline mutation carrier with five malignancies: a case report.

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Hereditary Cancer in Clinical Practice
|December 20, 2024
PubMed
Summary

Germline BRCA2 mutations can lead to a rare and diverse spectrum of cancers, potentially delaying diagnosis. Early genetic testing with comprehensive panels is recommended for individuals with a strong family history of cancer.

Keywords:
APCBRCA2 mutationBreast cancerGenetic testingLiposarcomaMyeloproliferative neoplasiaRenal cell carcinomaWhole-genome sequencing

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Silencing of BRCA2 to Identify Novel BRCA2-regulated Biological Functions in Cultured Human Cells
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Silencing of BRCA2 to Identify Novel BRCA2-regulated Biological Functions in Cultured Human Cells

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Area of Science:

  • Oncology
  • Genetics
  • Cancer Predisposition Syndromes

Background:

  • BRCA2 germline mutations are linked to various cancers, including breast, ovarian, pancreatic, and prostate cancer, with a potential association with melanoma.
  • The complete spectrum of tumors associated with BRCA2 mutations, especially when other genetic mutations are present, remains largely unexplored.

Purpose of the Study:

  • To highlight an unusual tumor spectrum in a patient with a BRCA2 germline mutation.
  • To emphasize the diagnostic challenges and the importance of comprehensive genetic testing in hereditary cancer predisposition.

Main Methods:

  • Case report of a 70-year-old female with a pathogenic BRCA2 c.5946del variant.
  • Detailed medical history spanning 15 years, documenting multiple independent cancer diagnoses.
  • Extended germline and tumor molecular analyses, including APC variants and HRD status.

Main Results:

  • The patient developed two breast cancers, liposarcoma, renal cell carcinoma, and myeloproliferative neoplasia.
  • Concurrent APC variants and unknown significance variants in BRIP1 and ATR were identified.
  • Tumor molecular profiles showed distinct differences in HRD status and copy number variations.

Conclusions:

  • The pathogenic BRCA2 c.5946del variant was associated with an atypical tumor spectrum, leading to delayed diagnosis of hereditary cancer predisposition.
  • Upfront genetic testing with large multigene panels or whole-genome sequencing is advised for early detection, particularly in high-risk families.