<prompt> Sentinel node biopsy for Ca breast is forEarly diagnosis of cancerFor staging the tumoursFrozen sectionOccult disease detection  <response>: Sentinel lymph nodes: Lymph nodes where the lymphatics drain first from a primary tumorSentinel lymph node biopsy can be identified by radiotracer or colored dyes. If the sentinel node is negative for metastasis, it is unlikely that other more distant nodes will be involved and the patient can be spared the morbidity like lymphedema of complete axillary dissection.Ref: Robbins 8e p1089 