Abstract P5-02-16: Is surgical excision of intraductal papillomas justified by the rate of upstaging to breast cancer?

Introduction: The management of intraductal papilloma (IDP) diagnosed on core needle biopsy (CNB) is controversial. Some investigators advocate surgical excision based on an upgrade risk of as high as 24%. Others contend that after adjusting for confounders, including size, clinical presentation, presence of other accompanying high-risk lesions and radiologic correlation, the upgrade risk may be as low as 2.3%. The implications for patient care would be the avoidance of invasive surgical procedures. The purpose of our study was to investigate the upgrade rate of IDP diagnosed on CNB to ductal carcinoma in situ (DCIS) and invasive carcinoma on subsequent surgical excision and the impact of associated high-risk borderline lesions and other clinicopathologic and radiologic variables. Methods: Our institutional pathology database was queried for all women who had a CNB with a diagnosis of intraductal papilloma between 2005-2018. Two independent pathologists reviewed all the core biopsy slides and excisional biopsy slides. Variables of interest included clinical, imaging and pathologic characteristics. Statistical analyses included Pearson’s chi-square, Wilcoxon rank-sum and logistic regression. Results: Out of 216 women, 19 (8.8%) upgraded to breast cancer (BC), including 14 (74%) DCIS and 5 (26%) invasive carcinoma. Out of 161 pure IDP without any atypia, 5 (3.1%) upgraded to BC and out of 45 IDP with atypical ductal hyperplasia (ADH), 13 (28.9%) upgraded to BC. Only one patient who upgraded to BC from IDP with ADH had a discordant finding on imaging. When we evaluated the clinicopathologic and radiologic variables associated with upgrading from pure IDP to BC on final pathology, we found that older age (u003e53 years) at time of biopsy (OR=1.05, 95%CI 1.01-1.09, p=0.027) and concomitant ipsilateral atypical ductal hyperplasia (ADH) (OR=9.69, 95%CI 3.37-27.81, p Conclusions: Our results support surgical excision of IDP on CNB when associated with ADH or diagnosed in women older than 53 years of age. The upgrade rate of 3.1% for IDP without atypia on CNB in younger women does not justify a universal recommendation for routine surgical excision. Citation Format: Paolo Cotzia, Ugur Ozerdem, Jiyon Lee, Jennifer Chun, Elianna Kaplowitz, Freya Schnabel, Farbod Darvishian. Is surgical excision of intraductal papillomas justified by the rate of upstaging to breast cancer? [abstract]. In: Proceedings of the 2019 San Antonio Breast Cancer Symposium; 2019 Dec 10-14; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2020;80(4 Suppl):Abstract nr P5-02-16.