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Locoregional Control According to Breast Cancer Subtype and Response to Neoadjuvant Chemotherapy in Breast Cancer Patients Undergoing Breast-conserving Therapy

  • Breast Oncology
  • Published:
Annals of Surgical Oncology Aims and scope Submit manuscript

Abstract

Background

Our group previously published data showing that patients could be stratified by constructed molecular subtype with respect to locoregional recurrence (LRR)-free survival after neoadjuvant chemotherapy and breast-conserving therapy (BCT). That study predated use of trastuzumab for human epidermal growth factor receptor 2 (HER2)-positive patients. The current study was undertaken to determine the impact of subtype and response to therapy in a contemporary cohort.

Methods

Clinicopathologic data from 751 breast cancer patients who received neoadjuvant chemotherapy (with trastuzumab if HER2+) and BCT from 2005 to 2012 were identified. Hormone receptor (HR) and HER2 status were used to construct molecular subtypes: HR+/HER2− (n = 369), HR+/HER2+ (n = 105), HR−/HER2+ (n = 58), and HR−/HER2− (n = 219). Actuarial rates of LRR were determined by the Kaplan–Meier method and compared by the log-rank test. Multivariate analysis was performed to determine factors associated with LRR.

Results

The pathologic complete response (pCR) rates by subtype were as follows: 16.5 % (HR+/HER2−), 45.7 % (HR+/HER2+), 72.4 % (HR−/HER2+), and 42.0 % (HR−/HER2−) (P < 0.001). Median follow-up was 4.6 years. The 5-year LRR-free survival rate for all patients was 95.4 %. Five-year LRR-free survival rates by subtype were 97.2 % (HR+/HER2−), 96.1 % (HR+/HER2+), 94.4 % (HR−/HER2+), and 93.4 % (HR−/HER2−) (P = 0.44). For patients with HR−/HER2+ disease, the LRR-free survival rates were 97.4 and 86.7 % for those who did and those who did not experience pCR, respectively. For patients with HR−/HER2− disease, the LRR-free survival rates were 98.6 % (pCR) versus 89.9 % (no pCR). On multivariate analysis, the HR−/HER2− subtype, clinical stage III disease, and failure to experience a pCR were associated with LRR.

Conclusions

Patients undergoing BCT after neoadjuvant chemotherapy have excellent rates of 5-year LRR-free survival that are affected by molecular subtype and by response to neoadjuvant chemotherapy.

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Acknowledgment

The University of Texas MD Anderson Cancer Center is supported in part by a Cancer Center Support grant (CA016672) from the National Institutes of Health. J.V. is supported by a grant from the Carlos III Health Institute. B.S. is supported by a grant from the Cancer Prevention and Research Institute of Texas (RP140020). E.M. is an R. Lee Clark Fellow of The University of Texas MD Anderson Cancer Center supported by the Jeanne F. Shelby Scholarship Fund.

Disclosure

The authors declare no conflict of interest.

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Authors and Affiliations

  1. Department of Breast Surgical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA

    Shannon K. Swisher, Jose Vila MD, Isabelle Bedrosian MD, Abigail S. Caudle MD, MPH, Henry M. Kuerer MD, PhD & Elizabeth A. Mittendorf MD, PhD

  2. Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA

    Susan L. Tucker PhD

  3. Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA

    Simona F. Shaitelman MD, EdM & Benjamin D. Smith MD

  4. Department of Breast Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA

    Jennifer K. Litton MD

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  1. Shannon K. Swisher
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  2. Jose Vila MD
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  3. Susan L. Tucker PhD
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  4. Isabelle Bedrosian MD
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Correspondence to Elizabeth A. Mittendorf MD, PhD.

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Swisher, S.K., Vila, J., Tucker, S.L. et al. Locoregional Control According to Breast Cancer Subtype and Response to Neoadjuvant Chemotherapy in Breast Cancer Patients Undergoing Breast-conserving Therapy. Ann Surg Oncol 23, 749–756 (2016). https://doi.org/10.1245/s10434-015-4921-5

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  • DOI: https://doi.org/10.1245/s10434-015-4921-5

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