Mechanisms of the FLASH effect: current insights and advances
Radiotherapy is a fundamental tool in cancer treatment, utilized in over 60% of cancer patients during their treatment course. While conventional radiotherapy is effective, it has limitations, including prolonged treatment durations, which extend patient discomfort, and toxicity to surrounding healt...
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Frontiers Media S.A.
2025-05-01
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| Series: | Frontiers in Cell and Developmental Biology |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fcell.2025.1575678/full |
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| author | Giulia Rosini Esther Ciarrocchi Esther Ciarrocchi Esther Ciarrocchi Beatrice D’Orsi Beatrice D’Orsi Beatrice D’Orsi |
| author_facet | Giulia Rosini Esther Ciarrocchi Esther Ciarrocchi Esther Ciarrocchi Beatrice D’Orsi Beatrice D’Orsi Beatrice D’Orsi |
| author_sort | Giulia Rosini |
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| description | Radiotherapy is a fundamental tool in cancer treatment, utilized in over 60% of cancer patients during their treatment course. While conventional radiotherapy is effective, it has limitations, including prolonged treatment durations, which extend patient discomfort, and toxicity to surrounding healthy tissues. FLASH radiotherapy (FLASH-RT), an innovative approach using ultra-high-dose-rate irradiation, has shown potential in selectively sparing normal tissues while maintaining unaltered tumor control. However, the precise mechanisms underlying this “FLASH effect” remain unclear. This mini-review explores key hypotheses, including oxygen depletion, radical-radical interactions, mitochondrial preservation, differential DNA damage repair, and immune modulation. Oxygen levels significantly affect tissue response to radiation by promoting radical recombination, preserving mitochondrial function, and differentially activating DNA repair pathways in normal versus tumor tissues. However, the extent to which oxygen depletion contributes to the FLASH effect remains debated. Additionally, FLASH-RT may modulate the immune response, reducing inflammation and preserving immune cell function. To further enhance its therapeutic potential, FLASH-RT is increasingly being combined with complementary strategies such as radioprotectors, immunomodulators, and nanotechnology platforms. These combinations aim to amplify tumor control while further reducing normal tissue toxicity, potentially overcoming current limitations. Despite promising preclinical evidence, the exact mechanisms and clinical applicability of FLASH-RT require further investigation. Addressing these gaps is crucial for optimizing FLASH-RT and translating its potential into improved therapeutic outcomes for cancer patients. Continued research is essential to harness the full benefits of the FLASH effect, offering a paradigm shift in radiation oncology. |
| format | Article |
| id | doaj-art-e28eb8089d2b4bccb361a3ccad2b2d14 |
| institution | OA Journals |
| issn | 2296-634X |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Cell and Developmental Biology |
| spelling | doaj-art-e28eb8089d2b4bccb361a3ccad2b2d142025-08-20T02:16:09ZengFrontiers Media S.A.Frontiers in Cell and Developmental Biology2296-634X2025-05-011310.3389/fcell.2025.15756781575678Mechanisms of the FLASH effect: current insights and advancesGiulia Rosini0Esther Ciarrocchi1Esther Ciarrocchi2Esther Ciarrocchi3Beatrice D’Orsi4Beatrice D’Orsi5Beatrice D’Orsi6Institute of Neuroscience, Italian National Research Council, Pisa, ItalyDepartment of Physics, University of Pisa, Pisa, ItalyNational Institute of Nuclear Physics, Section of Pisa, Pisa, ItalyUniversity of Pisa, Center for Instrument Sharing of the University of Pisa (CISUP), Pisa, ItalyInstitute of Neuroscience, Italian National Research Council, Pisa, ItalyNational Institute of Nuclear Physics, Section of Pisa, Pisa, ItalyUniversity of Pisa, Center for Instrument Sharing of the University of Pisa (CISUP), Pisa, ItalyRadiotherapy is a fundamental tool in cancer treatment, utilized in over 60% of cancer patients during their treatment course. While conventional radiotherapy is effective, it has limitations, including prolonged treatment durations, which extend patient discomfort, and toxicity to surrounding healthy tissues. FLASH radiotherapy (FLASH-RT), an innovative approach using ultra-high-dose-rate irradiation, has shown potential in selectively sparing normal tissues while maintaining unaltered tumor control. However, the precise mechanisms underlying this “FLASH effect” remain unclear. This mini-review explores key hypotheses, including oxygen depletion, radical-radical interactions, mitochondrial preservation, differential DNA damage repair, and immune modulation. Oxygen levels significantly affect tissue response to radiation by promoting radical recombination, preserving mitochondrial function, and differentially activating DNA repair pathways in normal versus tumor tissues. However, the extent to which oxygen depletion contributes to the FLASH effect remains debated. Additionally, FLASH-RT may modulate the immune response, reducing inflammation and preserving immune cell function. To further enhance its therapeutic potential, FLASH-RT is increasingly being combined with complementary strategies such as radioprotectors, immunomodulators, and nanotechnology platforms. These combinations aim to amplify tumor control while further reducing normal tissue toxicity, potentially overcoming current limitations. Despite promising preclinical evidence, the exact mechanisms and clinical applicability of FLASH-RT require further investigation. Addressing these gaps is crucial for optimizing FLASH-RT and translating its potential into improved therapeutic outcomes for cancer patients. Continued research is essential to harness the full benefits of the FLASH effect, offering a paradigm shift in radiation oncology.https://www.frontiersin.org/articles/10.3389/fcell.2025.1575678/fullradiotherapyultra-high-dose rate irradiationflashcell deathcancer metabolismcancer cells |
| spellingShingle | Giulia Rosini Esther Ciarrocchi Esther Ciarrocchi Esther Ciarrocchi Beatrice D’Orsi Beatrice D’Orsi Beatrice D’Orsi Mechanisms of the FLASH effect: current insights and advances Frontiers in Cell and Developmental Biology radiotherapy ultra-high-dose rate irradiation flash cell death cancer metabolism cancer cells |
| title | Mechanisms of the FLASH effect: current insights and advances |
| title_full | Mechanisms of the FLASH effect: current insights and advances |
| title_fullStr | Mechanisms of the FLASH effect: current insights and advances |
| title_full_unstemmed | Mechanisms of the FLASH effect: current insights and advances |
| title_short | Mechanisms of the FLASH effect: current insights and advances |
| title_sort | mechanisms of the flash effect current insights and advances |
| topic | radiotherapy ultra-high-dose rate irradiation flash cell death cancer metabolism cancer cells |
| url | https://www.frontiersin.org/articles/10.3389/fcell.2025.1575678/full |
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