Abstract
Purpose
There are limited data on trastuzumab–pertuzumab (HP)-based treatments beyond the first-line, HER2+ metastatic breast cancer (MBC) setting. We conducted a phase II study of eribulin mesylate, which extends survival in MBC, with HP in patients with previously treated HER2+ MBC to evaluate efficacy, toxicity, and genomic alterations driving therapeutic response.
Methods
After a run-in phase for eribulin dosing, two cohorts were enrolled (Cohort A-no prior pertuzumab; Cohort B-prior pertuzumab). All patients received eribulin 1.4 mg/m2 on days 1, 8 with standard-dose HP on day 1 (21-day cycles). The primary endpoint was objective response rate (ORR). Genomic characterization via whole exome sequencing (WES) was completed on tumor DNA and matched germline DNA from 19 patients.
Results
The six-patient run-in established a dose of eribulin 1.4 mg/m2 with HP. Cohorts A and B enrolled 17 and 7 patients, respectively. Accrual stopped early due to an evolving treatment landscape and slow enrollment. The ORR was 26.3% (95% Confidence Interval [CI] 9.2–51.2%) in Cohort A and 0% in Cohort B (95% CI 0–41.0%). WES revealed more frequent alterations in TP53 (p < 0.05, q > 0.05) in patients without clinical benefit (disease control for < 24 weeks) which was not significant after multiple hypothesis correction.
Conclusion
Eribulin–HP had manageable toxicity and modest clinical activity in patients without prior pertuzumab exposure. This study provides a preliminary landscape of somatic alterations in this patient cohort. Our data add to the literature on how genomic alterations may predict for therapy response/resistance, as we work to individualize choices in a quickly evolving HER2+ MBC treatment landscape.
Trial registration
www.clinicaltrials.gov, NCT01912963. Registered 24 July 2013.
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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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Acknowledgements
We thank the patients who participated in this study and who graciously provided blood and tissue samples for genomic analyses. We also thank Kaitlyn Bifolck, BA, for her assistance with manuscript formatting and journal submission.
Funding
Eisai Co. Ltd. In addition, Susan G. Komen (CCR14298143 and CCRCR18552788 to RAF) and American Cancer Society (MRSG-14-240-01-CPPB to RAF).
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Conceptualization—RAF, IVL, NUL, NW; data curation—RAF, IVL, SMB, EJ, KH, J B-B, NW; formal analysis—RAF, IVL, TL, NT, SMB, EJ, JB-B, NW; funding acquisition—RAF and NUL; investigation—all authors; methodology—RAF, IVL, SMB, EJ, NW, NUL; supervision—RAF and NW; writing: original draft—IVL, RAF, SMB; writing: review & editing—all authors.
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IVL reports institutional honoraria from Pfizer, Astra-Zeneca, and Amgen. IEK reports research support (paid to his institution) from Genentech/Roche and Pfizer, has received fees from Novartis and Merck for Data Monitoring Board participation, received honoraria from Celltrion, and has received consulting fees from Bristol Meyers Squibb, Daiichi/Sankyo, Macrogenics, Context Therapeutics, Taiho Oncology, Genentech/Roche, Seattle Genetics, and AstraZeneca. NU reports research support (to institution) from Genentech, Merck, Pfizer, Seattle Genetics; Consultant/ad board: Puma, Seattle Genetics, Daiichi Sankyo, AstraZeneca, Denali Therapeutics, California Institute for Regenerative Medicine, Prelude Therapeutics. RAF reports research support (to institution, no salary support): Eisai and Puma. SJI has received institutional research funding from Abbive, Astrazeneca, Genetech, Merck and OcnoPep, and fees from Seattle genetics, Novartis, Puma. N.W. reports advisory relationships and consulting with Eli Lilly and Co.; advising and stockholding interest in Relay Therapeutics; and grant support from Puma Biotechnology. JB-B is now employed by Cellarity, Inc. Cambridge, MA, USA.
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The study was conducted according to the current guidelines for good and sound research practice after approval from the Dana-Farber Cancer Institute Office for Human Research Studies.
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The study was conducted according to the current guidelines for good and sound research practice after approval from the Dana-Farber Cancer Institute Office for Human Research Studies.
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Nikhil Wagle and Rachel A. Freedman share co-senior authorship.
Prior Presentations: American Society of Clinical Oncology (ASCO) Annual Meeting, June 2–6, 2017, Chicago, IL.
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Balch, S.M., Vaz-Luis, I., Li, T. et al. A phase II study of efficacy, toxicity, and the potential impact of genomic alterations on response to eribulin mesylate in combination with trastuzumab and pertuzumab in women with human epidermal growth factor receptor 2 (HER2)+ metastatic breast cancer. Breast Cancer Res Treat 189, 411–423 (2021). https://doi.org/10.1007/s10549-021-06329-x
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DOI: https://doi.org/10.1007/s10549-021-06329-x