What is the most common site for metastases in breast cancer?

• A. Liver
• B. Lymph nodes
• C. Brain
• D. Bones

Answer: (B)

The most common site for metastases in breast cancer is lymph nodes. During the progression of breast cancer, tumor cells often first spread to the nearby lymph nodes, particularly those in the axilla (underarm area). The lymphatic system serves as a pathway for cancer cells to disseminate from the primary tumor to other areas of the body.

When breast cancer cells enter the lymphatic system, they can be detected in sentinel lymph nodes during clinical assessments, and this involvement is a critical factor in staging the cancer and planning treatment. The presence of metastases in lymph nodes can significantly influence prognosis and treatment decisions. While breast cancer can spread to other organs such as the bones, liver, and brain, lymph nodes are typically the initial sites of metastasis due to their anatomical proximity and role in filtering lymphatic fluid from the breast.