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The surgical management of breast cancer has become less invasive in recent years. Accurate lymphatic staging remains crucial for determining adjuvant treatment and prognosis. Sentinel node biopsy enables highly accurate lymphatic staging with minimal morbidity. In this article we give a historical overview, outline the technique, give succinct guidelines for practice based on current evidence, examine recently published work as well as highlight the most important trials in progress. The advent of sentinel node biopsy for the routine treatment of breast carcinoma will have significant implications on the whole team involved in beast cancer care. Training for the entire team needs to be addressed, and preparations made as patients are likely to soon demand this procedure as part of the routine management of their breast carcinoma.