Summary
Folate receptor alpha (FRα) has been reported to be expressed in up to 80% of triple-negative breast cancers (TNBC) with limited expression in normal tissues, making it a promising therapeutic target. Mirvetuximab soravtansine (mirvetuximab-s) is an antibody drug conjugate which has shown promise in the treatment of FRα-positive solid tumors in early phase clinical trials. Herein, are the results of the first prospective phase II trial evaluating mirvetuximab-s in metastatic TNBC. Patients with advanced, FRα-positive TNBC were enrolled on this study. Mirvetuximab-s was administered at a dose of 6.0 mg/kg every 3 weeks. 96 patients with advanced TNBC consented for screening. FRα staining was performed on tumor tissue obtained from 80 patients. The rate of FRα positivity by immunohistochemistry was 10.0% (8/80). Two patients were treated on study, with best overall responses of stable disease in one and progressive disease in the other. Adverse events were consistent with earlier studies. The study was terminated early due to the low rate of FRα positivity in the screened patient population and lack of disease response in the two patients treated. The observed rate of FRα positivity was considerably lower than previously reported and none of the patients had a partial or complete response. Treatment with mirvetuximab-s should only be further explored in TNBC if an alternate biomarker strategy is developed for patient selection on the basis of additional preclinical data.
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Funding
This study was approved and funded in part by the National Comprehensive Cancer Network (NCCN) Oncology Research Program from general research support provided by ImmunoGen, Inc., the National Institutes of Health/National Cancer Institute (N01-CM-2011-00039), and generous philanthropic contributions to The University of Texas MD Anderson Cancer Center Moon Shots Program. Dr. Yam is supported by the Allison and Brian Grove Endowed Fellowship for Breast Medical Oncology, the Susan Papizan Dolan Fellowship in Breast Oncology, and the 2018 Gianni Bonadonna Breast Cancer Research Fellowship. Any opinions, findings, and conclusions expressed in this material are those of the author(s) and do not necessarily reflect those of the sponsors.
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J.K.L. has received grant or research support from Novartis, Medivation/Pfizer, Genentech, GSK, EMD-Serono, Astra-Zeneca, Medimmune, Zenith, Jounce; participated in Speaker’s Bureau for MedLearning, Physician’s Education Resource, Prime Oncology, Medscape, Clinical Care Options; received honoraria from UpToDate; served on advisory committees or review panels for Astra-Zeneca, Ayala, Pfizer (all uncompensated), NCCN, ASCO, NIH, PDQ, SITC Breast Committee, SWOG Breast Committee. J.S. is a full-time employee and shareholder of ImmunoGen, Inc. S.L.M. has received research support from the NCCN for the clinical trial. All other authors declare that they have no conflicts of interest.
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Yam, C., Rauch, G.M., Rahman, T. et al. A phase II study of Mirvetuximab Soravtansine in triple-negative breast cancer. Invest New Drugs 39, 509–515 (2021). https://doi.org/10.1007/s10637-020-00995-2
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DOI: https://doi.org/10.1007/s10637-020-00995-2