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BRCA2 – Gene, Mutation & Cancer Risk

BRCA2 is a human tumor suppressor gene. Mutations in this gene significantly increase the risk of breast, ovarian, and other cancers.

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Things worth knowing about "BRCA2"

BRCA2 is a human tumor suppressor gene. Mutations in this gene significantly increase the risk of breast, ovarian, and other cancers.

What is BRCA2?

BRCA2 (Breast Cancer Gene 2) is a tumor suppressor gene located on chromosome 13. It encodes a protein that plays a critical role in the repair of DNA double-strand breaks. When functioning normally, it protects cells from uncontrolled growth and cancer development. When a mutation is present in the BRCA2 gene, this protective function is impaired, significantly increasing the risk of certain cancers.

Function of the BRCA2 Gene

The BRCA2 protein is a key component of the homologous recombination pathway of DNA repair. It interacts with the protein RAD51 and guides it to sites of DNA damage to facilitate repair. Without functional BRCA2 activity, DNA damage cannot be correctly resolved, leading to genomic instability and ultimately to tumor formation.

BRCA2 Mutations and Cancer Risks

Mutations in the BRCA2 gene are inherited in an autosomal dominant pattern, meaning that a single altered copy of the gene is sufficient to significantly increase the risk of certain cancers. The most commonly associated conditions include:

Breast cancer: The lifetime risk for breast cancer in female BRCA2 mutation carriers is approximately 45–85 %. Men with a BRCA2 mutation also face an elevated risk of around 6–8 %.
Ovarian cancer: The risk is approximately 10–30 %, compared to 1–2 % in the general population.
Prostate cancer: Men with a BRCA2 mutation have a significantly elevated risk of aggressive prostate cancer.
Pancreatic cancer: The risk is elevated compared to the general population.
Melanoma: A slightly increased risk of malignant melanoma has also been reported.

Diagnosis and Genetic Testing

A BRCA2 mutation is diagnosed through molecular genetic analysis of a blood or saliva sample. Testing is recommended for individuals with:

A personal or family history of breast or ovarian cancer at a young age
Multiple cancer diagnoses within the family
Male breast cancer in the family
Membership in ethnic groups with a higher mutation prevalence (e.g., Ashkenazi Jews)

Before and after genetic testing, genetic counseling should be provided to help interpret results and offer psychosocial support.

Prevention and Surveillance

For individuals with a confirmed BRCA2 mutation, several preventive options are available:

Enhanced screening: Regular mammograms, breast MRI scans, gynecological check-ups, and PSA testing for men.
Risk-reducing surgery: Prophylactic mastectomy (removal of breast tissue) and/or salpingo-oophorectomy (removal of fallopian tubes and ovaries) can substantially reduce cancer risk.
Chemoprevention: In selected cases, medications such as tamoxifen may be considered to reduce breast cancer risk.

Treatment of BRCA2-Associated Cancers

Knowledge of a BRCA2 mutation significantly influences treatment decisions. PARP inhibitors (e.g., olaparib, niraparib) are an important drug class used specifically for BRCA2-mutated tumors, as these tumors are particularly sensitive to this type of therapy. Platinum-based chemotherapy agents also show increased effectiveness in BRCA2-mutated cancers.

References

Wooster R, Weber BL. Breast and ovarian cancer. New England Journal of Medicine, 2003; 348(23):2339–2347.
National Comprehensive Cancer Network (NCCN). NCCN Clinical Practice Guidelines in Oncology: Genetic/Familial High-Risk Assessment: Breast, Ovarian, and Pancreatic. Version 2024.
Kuchenbaecker KB et al. Risks of breast, ovarian, and contralateral breast cancer for BRCA1 and BRCA2 mutation carriers. JAMA, 2017; 317(23):2402–2416.

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