Surgical management of early stage invasive breast cancer (stage I and II). Provincial Breast Disease Site Group.

GUIDELINE QUESTION: What is the optimal surgical management of early stage invasive breast cancer (stage I and II)? More specifically, what is the relative efficacy (and safety) of breast conservation therapy (lumpectomy with axillary dissection) compared with modified radical mastectomy? OBJECTIVE: To make recommendations about surgical management and techniques in the treatment of early stage invasive breast disease (stage I and II).