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• W2051713088 abstract "Purpose: To analyse changes of cell inactivation and proliferation under therapeutic irradiation conditions along the proton spread out Bragg peak (SOBP) with particular emphasis on its distal declining edge.Materials and methods: HTB140 cells were irradiated at four positions: plateau, middle, distal end and distal declining edge of the 62 MeV proton SOBP. Doses ranged from 2–16 Gy. They were normalised in the middle of SOBP and delivered following the axial physical dose profile. Survival, proliferation and cell cycle were assessed seven days after irradiation.Results: Moving from proximal to distal irradiation position surviving fractions at 2 Gy (SF2) decreased from 0.88–0.59. Increased radiosensitivity of the cells was noticed for the doses below 4 Gy, resulting in two gradients of cell inactivation, stronger for lower and weaker for higher doses. Relative biological effectiveness (RBE) increased from 1.68–2.84 at the distal end of SOBP. A further rise of RBE reaching 7.14 was at its distal declining edge. Following the axial physical dose profile of SOBP the strongest inactivation was attained at its distal end and was comparable to that at its declining edge.Conclusions: Survival data confirmed very high radioresistance of HTB140 cells. An effect similar to low-dose hyper radiosensitivity (HRS) was observed for order of magnitude larger doses. Better response of cells to protons than to γ-rays was illustrated by rather high RBE. Strong killing ability at the SOBP distal declining edge was the consequence of increasing proton linear energy transfer." @default.
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• W2051713088 date "2010-07-05" @default.
• W2051713088 modified "2023-10-18" @default.
• W2051713088 title "Response of a radioresistant human melanoma cell line along the proton spread-out Bragg peak" @default.
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• W2051713088 doi "https://doi.org/10.3109/09553002.2010.481322" @default.
• W2051713088 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20597839" @default.
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