The management of lobular neoplasia identified on percutaneous core breast biopsy.

The management of lobular neoplasia (LN) found on percutaneous core biopsy remains a clinical dilemma. The purpose of this study was to establish guidelines for the management of LN when obtained on percutaneous core needle biopsy. A retrospective review of the Breast Imaging Tissue Sampling Database at New York Presbyterian Hospital-Columbia Comprehensive Breast Center was performed from 1998 to 2000. A total of 1460 percutaneous core breast biopsies were performed using 11- or 14-gauge needles with LN identified in 43 biopsies from 34 patients. Eleven biopsies were ultrasound guided for nonpalpable masses and 32 were stereotactically guided for mammographically detected densities (10) and microcalcifications (22). The 43 LN biopsies were divided into three groups based on additional findings associated with LN on core biopsy: group I (n = 19), LN with invasive cancer or ductal carcinoma in situ (DCIS); group II (n = 11), LN plus a second indication for open surgical biopsy, such as atypical ductal hyperplasia (ADH), radial scar, phyllodes tumor, or intraductal papilloma; and group III (n = 13), LN plus benign fibrocystic changes. In group I, 19 of 19 biopsies (100%) yielded invasive cancer or DCIS on surgical biopsy versus 3 of 11 (27%) for group II, and 1 of 13 (8%) for group III. Outcomes in group III are described as follows: three patients were lost to follow-up, three patients did not undergo surgical biopsy but demonstrated more than 1 year of mammographic stability following core biopsy. Of the remaining seven patients, two had LN and ADH on surgical biopsy (one had a contralateral cancer), one had atypical lobular hyperplasia (with a contralateral cancer), two had LN and benign fibrocystic changes, one had LN and intraductal papilloma, and one had LN and invasive ductal carcinoma (IDC) with DCIS (with a contralateral cancer). These results suggest that surgical biopsy is indicated for patients with LN when found on core biopsy and when the biopsy demonstrates invasive cancer, DCIS, or other indications for surgical biopsy such as ADH, or in the examination of a patient with a synchronous contralateral breast cancer. The diagnosis of LN alone without these indications on percutaneous biopsy may not warrant routine surgical biopsy.