Evaluating the impact of axillary dissection on recurrence-free survival by extent of nodal disease in invasive lobular
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EPIDEMIOLOGY
Evaluating the impact of axillary dissection on recurrence‑free survival by extent of nodal disease in invasive lobular carcinoma of the breast Mary Kathryn Abel1,2 · Kelly Fahrner‑Scott1 · Jasmine Wong2 · Michael Alvarado2 · Cheryl Ewing2 · Laura J. Esserman2 · Catherine Park3 · Rita A. Mukhtar2 Received: 19 May 2020 / Accepted: 7 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Purpose Clinical trials have shown that axillary lymph node dissection (ALND) can be avoided for many breast cancer patients with limited nodal involvement. However, whether its omission is safe for those with invasive lobular carcinoma (ILC) is still questioned. We sought to evaluate the impact of ALND on recurrence-free survival (RFS) by extent of nodal disease in patients with ILC. Methods We performed a retrospective, cross-sectional analysis of ILC patients treated between 1990 and 2019 at our institution. Patients underwent either breast conservation surgery (BCS) or mastectomy. We used univariate and multivariate statistics in Stata 14.2 to evaluate associations between extent of axillary surgery and time to recurrence stratified by nodal burden. Results Of 520 cases, 387 (78.4%) were node negative, 74 (14.9%) had 1–2 positive nodes, and 59 (11.4%) had three or more positive nodes. Most patients (93.3%) had hormone receptor-positive disease, and 94.8% had low or intermediate-grade tumors. The rate of ALND significantly decreased over time (p
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