Landmark trials affecting the surgical management of invasive breast cancer.

Significant progress has been made in the surgical management of breast cancer. Most women diagnosed with early stage invasive breast cancer can now be managed with breast-conserving therapy to include a segmental mastectomy followed by radiation. Axillary lymph nodes are routinely assessed by sentinel lymph node biopsy. Axillary lymph node dissection is reserved for patients with documented nodal metastasis; however, here too progress has been made because a population of low-risk patients has been identified in whom a complete dissection is not required even in the setting of a positive sentinel lymph node. This article details the landmark clinical trials that have guided the surgical management of breast cancer.