Is family history high risk for breast cancer?

Question

Hi doctor,

I am a young professional who recently discovered a lump during a self-examination. My mother had breast cancer, so I am extremely anxious. The uncertainty is overwhelming.

I have scheduled a biopsy, but the waiting period is very nerve-wracking. Are there any genetic tests that I should consider? How does a family history of breast cancer impact my personal risk?

What are the treatment options available if breast cancer is detected in its early stages? Is a complete recovery possible in such cases?

Right now, my career and future plans feel uncertain and on hold.

Please help me.

Thanks.

Answer 1

Hi,

Welcome to icliniq.com.

I can understand your concern.

Let me explain this to you.

The breast cancer susceptibility genes, BRCA1 (breast cancer gene 1) and BRCA2 (breast cancer gene 2), were discovered in the early 1990s. Inheriting a mutation in these tumor suppressor genes accounts for approximately 7 percent of all breast cancer cases and 20 to 50 percent of ovarian cancer cases associated with BRCA1, and 10 to 20 % for BRCA2.

The estimated carrier frequency of BRCA1 mutations in the general population is 1 in 300, and for BRCA2, it is 1 in 800. In some populations, the BRCA mutation carrier frequency is significantly higher, approximately 1 in 40. This means that between 400,000 and 1 million individuals in the United States may be carriers of BRCA gene mutations. Despite BRCA mutation testing being available for over a decade and increased awareness of associated cancer risks, only around 5 % of carriers have been identified.

The cumulative probability (also known as penetrance) that a woman with a BRCA1 or BRCA2 mutation will develop breast cancer by age 70 is estimated at 65 percent for BRCA1 and 45 % for BRCA2. However, these risks vary depending on family history. Women who have relatives diagnosed with breast cancer at a young age or with bilateral breast cancer are at higher risk. The location of the mutation within the gene can also influence the risk. For example, mutations within the central region of the BRCA2 gene, known as the ovarian cancer cluster region (OCCR), are associated with an increased risk of ovarian cancer but a lower risk of breast cancer.

Women with a BRCA mutation who have already had breast cancer are also at a significantly increased risk of developing contralateral breast cancer (CBC). In a case-control study involving women diagnosed with unilateral breast cancer before age 55, those with BRCA1 mutations had a 4.5-fold increased risk, and those with BRCA2 mutations had a 3.4-fold increased risk of developing cancer in the other breast. The younger the age at first diagnosis, particularly for BRCA1 carriers, the higher the risk of contralateral cancer. The effect of age at first diagnosis on contralateral cancer risk in BRCA2 carriers is less clear.

Men with a BRCA2 mutation also have an elevated risk of breast cancer, with a cumulative lifetime risk by age 70 estimated at 6.8 %. The risk for male BRCA1 mutation carriers is less well established but is also believed to be increased.

Management approach:

You should be evaluated and advised by a multidisciplinary team (MDT) including:

Breast oncology surgeon.
Medical oncologist.
Histopathologist.
Radiologist.
Psychiatrist.
Psychotherapist

You should discuss the option of prophylactic mastectomy (preventive removal of breast tissue) and reconstructive surgery with your breast surgeon. This is one of the best preventive strategies available for high-risk BRCA mutation carriers.

Psychiatric and psychological support is also highly recommended to help manage the emotional stress and anxiety associated with being a mutation carrier.

Please do not worry. Being a BRCA mutation carrier does not mean you will definitely develop cancer, and there are highly effective preventive strategies and early interventions available.

I would appreciate it if you could provide your feedback.

I hope this answer helps you.

Thank you.