Abstract P5-22-12: Oncological safety of nipple-areola sparing mastectomy in comparison with skin sparing and total mastectomy: Results from a NCI-designated comprehensive cancer center

Nipple-areola sparing mastectomy (NSM) may be offered to some women with breast cancer as an alternative to skin sparing (SSM) or total mastectomy (TM) with excellent cosmetic results and acceptable recurrence risk. The aim of this study is to determine the local/regional recurrence rate of NSM in comparison to SSM and TM at our institution and to determine the factors that may be associated with risk of recurrence. Women who underwent NSM (n=148), SSM (n=660) or TM (n=443) at City of Hope National Medical Center between May 2007 and December 2014 for Stage 0-III breast cancer were identified retrospectively. Exclusions were: women with inflammatory breast cancer and those who had mastectomy for recurrent breast cancer. Overall survival (OS) and disease free survival (DFS) were analyzed using Cox regression controlling for age, race/ethnicity, stage, histology, grade, hormone receptor and Her2 receptor status. There were total of 165 NSMs, 704 SSMs and 466 TMs performed for cancer, accounting for the patients with bilateral cancers. The median follow up time was 38, 58 and 55 months for NSM, SSM and TM, respectively. Median (range) age at diagnosis was 49 (23-74) for NSM, 51 (23-90) for SSM and 59 (26-92) for TM. In the NSM group, 76% of patients had invasive ductal cancer (IDC) and 15% had ductal carcinoma in-situ (DCIS); this was comparable to 73% and 13% in the SSM group and 78% and 9% in the TM group, respectively. The majority of patients who underwent NSM had Stage II disease (45%), which was similar to SSM (43%) and TM (44%). Only 3% of NSM patients had Stage III disease compared to 17% of SSM patients and 29% of TM patients. Most of the patients in all 3 surgical groups received adjuvant chemotherapy (NSM 59%; SSM 52%; TM 51%). Of patients who underwent NSM, 20% received neoadjuvant chemotherapy, compared with 29% of SSM patients and 35% of TM patients. The local/regional recurrence rate per breast was 12/165 (7.3%) for NSM, 23/704 (3.3%) for SSM and 11/466 (2.4%) for TM (n=11). Median time to recurrence was 20, 26 and 16 months for NSM, SSM and TM, respectively. Of the NSMs performed only 1 recurrence occurred at the nipple-areolar complex (0.6%), 9 recurrences were at the chest wall (5.5%) and 2 were at the axilla (1.2%). Eight recurrences after NSM had DCIS in addition to IDC at the time of initial diagnosis while 2 had pure DCIS, 1 had pure IDC and 1 had invasive lobular cancer. There were 8 recurrences with estrogen receptor (ER) and progesterone receptor (PR) positivity at the time of initial diagnosis, that converted to ER+, PR-. One third of recurrences after NSM had multifocal disease. There was no significant difference found in adjusted overall survival (p=0.49) and adjusted disease free survival (p=0.10) among NSM, SSM and TM patients. Even though there is higher rate of local/regional recurrence with NSM, there is no difference in overall and disease-free survival at our institution. Presence of DCIS may be an important factor for recurrence. From these data we conclude that NSM is an oncologically acceptable alternative to SSM and TM, with excellent cosmetic results.

Citation Format: Bostanci Z, Wang X, Ottesen R, Nikowitz J, Jones VC, Springer L, Lai L, Taylor L, Vito CA, Paz IB, Niland J, Kruper L, Yim JH. Oncological safety of nipple-areola sparing mastectomy in comparison with skin sparing and total mastectomy: Results from a NCI-designated comprehensive cancer center [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr P5-22-12.