Selection of patients for breast conserving surgery.

The majority of patients with breast cancer can be treated by partial mastectomy and radiation therapy. Ineligibility for breast conservation usually is related to previous radiation or the inability to receive radiation for other reasons. For patients who can receive radiation, selection for breast conservation involves the estimation of the risk for in-breast recurrence and the ability to achieve a satisfactory cosmetic result. Multiple sites of cancer within the breast and the inability to attain negative pathologic margins on the excised breast specimen are predictive for an increased risk of recurrence. The cosmetic result is compromised by excision of large volumes of breast tissue. Although the size of the tumor is not an important consideration for in-breast recurrence, the relation of the size of the tumor, and hence the volume of tissue excised, to the size of the breast is an important cosmetic consideration. Compared to invasive ductal carcinoma, an extensive intraductal component or invasive lobular carcinoma tends to be more difficult to define within the breast and may require excision of a large volume of tissue to obtain negative pathologic margins.