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At the present stage of scientific and technological progress, high-dose radiotherapy has become a common way to combat severe cancers. However, this treatment option is limited by normal tissues radiosensitivity. The developed technology of ultrashort pulse delivery of a dose of ionizing radiation to the zone of interest (FLASH radiotherapy) can achieve a high local control over tumor growth while sparing healthy tissues. This review summarizes the experimental findings supporting the possibility of transitioning to clinical studies of FLASH radiotherapy.