Abstract
Purpose
Immune checkpoint inhibition (ICI) has demonstrated clinically significant efficacy when combined with chemotherapy in triple negative breast cancer (TNBC). Although many patients derived benefit, others do not respond to immunotherapy, therefore relying upon innovative combinations to enhance response. Local therapies such as radiation therapy (RT) and cryotherapy are immunogenic and potentially optimize responses to immunotherapy. Strategies combining these therapies and ICI are actively under investigation. This review will describe the rationale for combining ICI with targeted local therapies in breast cancer.
Methods
A literature search was performed to identify pre-clinical and clinical studies assessing ICI combined with RT or cryotherapy published as of August 2021 using PubMed and ClinicalTrials.gov.
Results
Published studies of ICI with RT and IPI have demonstrated safety and signals of early efficacy.
Conclusion
RT and cryotherapy are local therapies that can be integrated safely with ICI and has shown promise in early trials. Randomized phase II studies testing both of these approaches, such as P-RAD (NCT04443348) and ipilimumab/nivolumab/cryoablation for TNBC (NCT03546686) are current enrolling. The results of these studies are paramount as they will provide long term data on the safety and efficacy of these regimens.
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AYH, SAD, and ST contributed to conception and execution of the review. AYH, SAD, and ST wrote sections of the manuscript and HLM critically reviewed the manuscript. All authors contributed to manuscript revision, read, and approved the submitted version.
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Dr. Ho reports grants from Merck & Co., grants from GSK, Inc., personal fees from Amgen, outside the submitted work. Dr. McArthur reports grants and personal fees from Merck, Lilly, and Bristol-Myers Squibb as well as personal fees from AstraZeneca, Seattle Genetics, Genentech, Pfizer, Immunomedics, Genomic Health, Puma Biotechnology, and Daiichi-Sankyo, outside the submitted work. Dr. Tabrizi and Ms. Dunn have nothing to disclose.
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Ho, A.Y., Tabrizi, S., Dunn, S.A. et al. Current advances in immune checkpoint inhibitor combinations with radiation therapy or cryotherapy for breast cancer. Breast Cancer Res Treat 191, 229–241 (2022). https://doi.org/10.1007/s10549-021-06408-z
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DOI: https://doi.org/10.1007/s10549-021-06408-z