Abstract
Background
Endocrine resistant metastatic disease develops in ~ 20–25% of hormone-receptor-positive (HR+) breast cancer (BC) patients despite endocrine therapy (ET) use. Upregulation of HER family receptor tyrosine kinases (RTKs) represent escape mechanisms in response to ET in some HR+ tumors. Short-term neoadjuvant ET (NET) offers the opportunity to identify early endocrine escape mechanisms initiated in individual tumors.
Methods
This was a single arm, interventional phase II clinical trial evaluating 4 weeks (± 1 week) of NET in patients with early-stage HR+/HER2-negative (HER2-) BC. The primary objective was to assess NET-induced changes in HER1-4 proteins by immunohistochemistry (IHC) score. Protein upregulation was defined as an increase of ≥ 1 in IHC score following NET.
Results
Thirty-seven patients with cT1-T3, cN0, HR+/HER2- BC were enrolled. In 35 patients with evaluable tumor HER protein after NET, HER2 was upregulated in 48.6% (17/35; p = 0.025), with HER2-positive status (IHC 3+ or FISH-amplified) detected in three patients at surgery, who were recommended adjuvant trastuzumab-based therapy. Downregulation of HER3 and/or HER4 protein was detected in 54.2% of tumors, whereas HER1 protein remained low and unchanged in all cases. While no significant volumetric reduction was detected radiographically after short-term NET, significant reduction in tumor proliferation rates were observed. No significant associations were identified between any clinicopathologic covariates and changes in HER1-4 protein expression on multivariable analysis.
Conclusion
Short-term NET frequently and preferentially upregulates HER2 over other HER family RTKs in early-stage HR+/HER2- BC and may be a promising strategy to identify tumors that utilize HER2 as an early endocrine escape pathway.
Clinical trial registry
Trial registration number: NCT03219476.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
Investigator Initiated clinical trial (NCT03219476) supported by Rock River Foundation and the Medical College of Wisconsin Cancer Center. Effort for this project was supported by the National Center for Advancing Translational Sciences, National Institutes of Health Awards KL2TR001438, R03 CA259594 I, and R01 CA267549 (HR).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by LNC, JMJ, YS and HR. Pathology protein analyses were performed by JMJ and HR. Biostatistical analyses were performed by AB and IC. The first draft of the manuscript was written by LNC and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Lubna N, Chaudhary has received consultant and advisory boards honoraria Puma Biotechnology, Seattle Genetics, Gilead Oncology, AstraZeneca, and Novartis Advisory as well as grant from Regeneron Pharmaceuticals outside the submitted work. Other authors have no financial interests to disclose.
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Presentations: Preliminary analysis of HER2 data in the first 14 patients was presented at San Antonio Breast Cancer Symposium (SABCS) 2019 as ‘Poster Presentation’.
Preliminary analysis of HER2 data for all patients was presented at SABCS 2020 as ‘Spotlight Poster Presentation’.
Preliminary analysis of HER1-4 upregulation for all patients was presented at SABCS 2021 as ‘Poster Presentation’.
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Chaudhary, L.N., Jorns, J.M., Sun, Y. et al. Frequent upregulation of HER2 protein in hormone-receptor-positive HER2-negative breast cancer after short-term neoadjuvant endocrine therapy. Breast Cancer Res Treat 201, 387–396 (2023). https://doi.org/10.1007/s10549-023-07038-3
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DOI: https://doi.org/10.1007/s10549-023-07038-3