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Background and Purpose: Low-dose hyperradiosensitivity (HRS), i.e., a relatively higher efficacy of doses ≤ 0.5 Gy compared to doses > 1 Gy, has been shown in a number of tumor cell lines in vitro. Therefore ultrafractionated irradiation, i.e., application of very low doses per fraction, has been proposed to improve the effects of radiotherapy. The present study investigates ultrafractionation...
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