Abstract
Background
Focused ultrasound (FUS) is an emerging technology, offering the capability of tuning and prescribing thermal and mechanical treatments within the brain. While early works in utilizing this technology have mainly focused on maximizing the delivery of therapeutics across the blood–brain barrier (BBB), the potential therapeutic impact of FUS-induced controlled thermal and mechanical stress to modulate anti-tumor immunity is becoming increasingly recognized.
Objective
To better understand the roles of FUS-mediated thermal and mechanical stress in promoting anti-tumor immunity in central nervous system tumors, we performed a comprehensive literature review on focused ultrasound-mediated immunomodulation and immunotherapy in brain tumors.
Methods
First, we summarize the current clinical experience with immunotherapy. Then, we discuss the unique and distinct immunomodulatory effects of the FUS-mediated thermal and mechanical stress in the brain tumor-immune microenvironment. Finally, we highlight recent findings that indicate that its combination with immune adjuvants can promote robust responses in brain tumors.
Results
Along with the rapid advancement of FUS technologies into recent clinical trials, this technology through mild-hyperthermia, thermal ablation, mechanical perturbation mediated by microbubbles, and histotripsy each inducing distinct vascular and immunological effects, is offering the unique opportunity to improve immunotherapeutic trafficking and convert immunologically “cold” tumors into immunologically “hot” ones that are prone to generate prolonged anti-tumor immune responses.
Conclusions
While FUS technology is clearly accelerating concepts for new immunotherapeutic combinations, additional parallel efforts to detail rational therapeutic strategies supported by rigorous preclinical studies are still in need to leverage potential synergies of this technology with immune adjuvants. This work will accelerate the discovery and clinical implementation of new effective FUS immunotherapeutic combinations for brain tumor patients.
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Data Availability
All the associated data in this review paper are included in the paper (Tables) or can be found in the cited literature.
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Acknowledgements
Costas Arvanitis research in this area is supported by the NIH (National Institutes of Health) Grant R37CA239039 (National Cancer Institute) and the Ian’s Friends Foundation. Graeme Woodworth’s research in this area is supported by NIH Grant R21NS113016 and the Focused Ultrasound Foundation
Funding
Costas Arvanitis research in this area is supported by NIH Grant R37CA239039 and the Ian’s Friends Foundation. Graeme Woodworth’s research in this area is supported by NIH Grant R21NS113016 and the Focused Ultrasound Foundation.
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Conceptualization: all authors; formal analysis and investigation: CK, CDA; writing—original draft preparation: CK, CDA; writing—review and editing: all authors.
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Kim, C., Lim, M., Woodworth, G.F. et al. The roles of thermal and mechanical stress in focused ultrasound-mediated immunomodulation and immunotherapy for central nervous system tumors. J Neurooncol 157, 221–236 (2022). https://doi.org/10.1007/s11060-022-03973-1
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DOI: https://doi.org/10.1007/s11060-022-03973-1