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The sentinel lymph node technique is a surgical approach for early-stage breast cancer, allowing targeted removal of affected lymph nodes. This method reduces the need for complete axillary dissection, minimizing risks such as lymphedema and shoulder mobility issues. By injecting a radioactive substance, surgeons can identify the sentinel node, which provides crucial information about metastasis and treatment options. This technique is particularly beneficial for patients with small tumors and no signs of lymph node involvement. However, it is not suitable for larger tumors or certain conditions. Overall, this approach enhances surgical precision and patient outcomes.