Which of the following is a common indication for sentinel node biopsy?

• A. Presence of a benign cyst
• B. Diagnosis of early-stage breast cancer
• C. Symptoms of fibrocystic breast changes
• D. Family history of non-breast cancer

Answer: (B)

Sentinel node biopsy is commonly performed in the context of early-stage breast cancer to assess the presence of metastasis in lymph nodes. This procedure helps determine whether cancer has spread beyond the primary tumor and into the axillary lymph nodes, which is crucial for staging the cancer and planning treatment. By identifying and examining the sentinel nodes—the first few lymph nodes into which a tumor drains—clinicians can avoid more extensive lymph node dissections if the sentinel nodes are found to be free of cancer.

In the context of the other options, they do not indicate the need for sentinel node biopsy in the same way. A benign cyst would not necessitate a biopsy to check lymph nodes since it is not cancerous. Symptoms related to fibrocystic changes generally pertain to benign breast conditions and do not imply the risk of lymphatic spread of cancer. Lastly, while a family history of breast cancer may increase personal risk factors, it does not itself indicate that a biopsy is needed unless there's a confirmed diagnosis of breast cancer. Thus, the diagnosis of early-stage breast cancer is the primary condition that justifies the use of sentinel node biopsy.