How Breast Cancer Spreads Breast cancer can spread through the lymph system. The lymph system includes lymph nodes, lymph vessels and lymph fluid found A Quick overview of the sentinel lymph node biopsy technique. A sentinel lymph node biopsy is a procedure that was developed to identify metastasis (spread of) breast. If breast cancer spreads, it usually spreads first to the lymph nodes close to the breast. Checking the lymph nodes before surgery. If you have early breast cancer. Whether the lymph nodes contain cancer cells is an important factor when staging breast cancer, determining treatment, and predicting survival. A sentinel lymph node biopsy (SLNB) is a procedure in which the sentinel lymph node is identified, removed, and examined to determine whether cancer cells are present. Breast cancer is a disease in which malignant (cancer) cells form in the tissues of the breast. A family history of breast cancer and other factors increase the risk. Treatment Options for Lymph Node Positive Breast Cancer Diagnosis, Treatments, and Prognosis for Lymph Node Positive Breast Cancer Share Pin Lymph Nodes and Cancer What is the lymph system? Our bodies have a network of lymph vessels and lymph nodes. (Lymph is pronounced limf.) This network is a part of the. Lymph Nodes. The lymph nodes under your arm, inside your breast, and near your collarbone are among the first places breast cancer spreads. If it spreads beyond these. What is breast cancer. Breast cancer is cancer that starts in the breast tissue. The breasts and lymphatic system. The breasts are made up of fat, connective tissue.