What is the most significant risk factor for breast cancer?

What is the most significant risk factor for breast cancer?

• A. Age
• B. Family history
• C. BRCA mutation
• D. Nulliparity

Answer: (A)

The most significant risk factor is age. Breast cancer risk rises with every passing year, and the vast majority of cases occur in older, postmenopausal women. This reflects cumulative exposure to DNA-damaging events and hormones over time, leading to more opportunities for cells in the breast to become cancerous. While a BRCA mutation confers a high individual risk, it is relatively rare in the population, so its overall impact on risk across all women is smaller than the impact of aging. Family history and nulliparity can increase risk, but their effect is generally smaller compared with the steep rise in risk that comes with aging.

The most significant risk factor is age. Breast cancer risk rises with every passing year, and the vast majority of cases occur in older, postmenopausal women. This reflects cumulative exposure to DNA-damaging events and hormones over time, leading to more opportunities for cells in the breast to become cancerous. While a BRCA mutation confers a high individual risk, it is relatively rare in the population, so its overall impact on risk across all women is smaller than the impact of aging. Family history and nulliparity can increase risk, but their effect is generally smaller compared with the steep rise in risk that comes with aging.