<prompt> Sentinel node biopsy for Carcinoma breast is forEarly diagnosis of cancerFor staging the tumorsFrozen sectionOccult disease detection  <response>: Sentinel node biopsy is a surgical procedure used to determine whether cancer has spread beyond a primary tumor into your lymphatic system. Its used most commonly in evaluating breast cancer and melanoma. The sentinel nodes are the first few lymph nodes into which a tumor drains. 