PuSH - Publikationsserver des Helmholtz Zentrums München: Non-conventional ultra-high dose rate (FLASH) microbeam radiotherapy provides superior normal tissue sparing in rat lung compared to non-conventional ultra-high dose rate (FLASH) radiotherapy.

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Wright, M.D.* ; Romanelli, P.* ; Bravin, A.* ; Le Duc, G.* ; Bräuer-Krisch, E.* ; Requardt, H.* ; Bartzsch, S. ; Hlushchuk, R.* ; Laissue, J.A.* ; Djonov, V.*

Non-conventional ultra-high dose rate (FLASH) microbeam radiotherapy provides superior normal tissue sparing in rat lung compared to non-conventional ultra-high dose rate (FLASH) radiotherapy.

Cureus 13:e19317 (2021)

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Conventional radiotherapy is a widely used non-invasive form of treatment for many types of cancer. However, due to a low threshold in the lung for radiation-induced normal tissue damage, it is of less utility in treating lung cancer. For this reason, surgery is the preferred treatment for lung cancer, which has the detriment of being highly invasive. Non-conventional ultra-high dose rate (FLASH) radiotherapy is currently of great interest in the radiotherapy community due to demonstrations of reduced normal tissue toxicity in lung and other anatomy. This study investigates the effects of FLASH microbeam radiotherapy, which in addition to ultra-high dose rate incorporates a spatial segmentation of the radiation field, on the normal lung tissue of rats. With a focus on fibrotic damage, this work demonstrates that FLASH microbeam radiotherapy provides an order of magnitude increase in normal tissue radio-resistance compared to FLASH radiotherapy. This result suggests FLASH microbeam radiotherapy holds promise for much improved non-invasive control of lung cancer.

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