What is the role of BRCA1 and BRCA2 genes in breast cancer?

• A. They produce hormones that reduce cancer risk
• B. They increase the risk of breast cancer when mutated
• C. They are unrelated to breast cancer
• D. They help in the treatment of breast cancer

Answer: (B)

BRCA1 and BRCA2 genes play a crucial role in the maintenance of genomic stability, particularly in the repair of DNA breaks. When these genes are functioning normally, they produce proteins that are involved in repairing damaged DNA. However, mutations in either of these genes can significantly impair this repair process, leading to an accumulation of genetic errors. This accumulation can increase the likelihood of developing breast and ovarian cancer due to the consequent disruption of normal cellular functions and the promotion of uncontrolled cell growth.

The link between these mutations and cancer risk is well-established, with individuals carrying mutations in BRCA1 or BRCA2 having a significantly higher risk of developing breast cancer compared to those without these mutations. In fact, women with a BRCA1 mutation have up to a 72% chance of developing breast cancer by age 80, while those with a BRCA2 mutation have approximately a 69% chance. This genetic predisposition underlines the importance of BRCA1 and BRCA2 in cancer risk evaluation and helps inform screening and preventive strategies for at-risk individuals.