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Annals of Surgical Oncology
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01-10-2019 | Mastectomy | Breast Oncology

Neoadjuvant Endocrine Therapy Versus Neoadjuvant Chemotherapy in Node-Positive Invasive Lobular Carcinoma

Authors: M. J. Thornton, BA, H. V. Williamson, MS, K. E. Westbrook, MD, R. A. Greenup, MD, MPH, J. K. Plichta, MD, MS, L. H. Rosenberger, MD, MS, A. M. Gupta, MD, MA, T. Hyslop, PhD, E. S. Hwang, MD, MPH, O. M. Fayanju, MD, MA, MPHS

Published in: Annals of Surgical Oncology | Issue 10/2019

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Abstract

Background

Neoadjuvant chemotherapy (NACT) is often recommended for patients with node-positive invasive lobular carcinoma (ILC) despite unclear benefit in this largely hormone receptor-positive (HR+) group. We sought to compare overall survival (OS) between patients with node-positive ILC who received neoadjuvant endocrine therapy (NET) and those who received NACT.

Methods

Women with cT1–4c, cN1–3 HR+ ILC in the National Cancer Data Base (2004–2014) who underwent surgery following neoadjuvant therapy were identified. Kaplan–Meier curves and Cox proportional hazards modeling were used to estimate unadjusted and adjusted overall survival (OS), respectively.

Results

Of the 5942 patients in the cohort, 855 received NET and 5087 received NACT. NET recipients were older (70 vs. 54 years) and had more comorbidities (Charlson–Deyo score ≥ 1: 21.1% vs. 11.5%), lower cT classification (cT3–4: 44.2% vs. 51.0%), lower rates of mastectomy (72.5% vs. 82.2%), lower rates of pathologic complete response (0% vs. 2.5%), and lower rates of postlumpectomy (73.2% vs. 91.0%) and postmastectomy (60.0% vs. 80.8%) radiation versus NACT recipients (all p < 0.001). NACT recipients had higher unadjusted 10-year OS versus NET recipients (57.9% vs. 36.0%), but after adjustment, there was no significant difference in OS between the two groups (p = 0.10).

Conclusions

Patients with node-positive ILC who received NET presented with smaller tumors, older age, and greater burden of comorbidities versus NACT recipients but had similar adjusted OS. While there is evidence from clinical trials supporting efficacy of NET in HR+ breast cancer, our findings suggest the need for further, histology-specific investigation regarding the optimal inclusion and sequence of endocrine therapy and chemotherapy in ILC.
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Metadata
Title
Neoadjuvant Endocrine Therapy Versus Neoadjuvant Chemotherapy in Node-Positive Invasive Lobular Carcinoma
Authors
M. J. Thornton, BA
H. V. Williamson, MS
K. E. Westbrook, MD
R. A. Greenup, MD, MPH
J. K. Plichta, MD, MS
L. H. Rosenberger, MD, MS
A. M. Gupta, MD, MA
T. Hyslop, PhD
E. S. Hwang, MD, MPH
O. M. Fayanju, MD, MA, MPHS
Publication date
01-10-2019
Publisher
Springer International Publishing
Published in
Annals of Surgical Oncology / Issue 10/2019
Print ISSN: 1068-9265
Electronic ISSN: 1534-4681
DOI
https://doi.org/10.1245/s10434-019-07564-9

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