Fig. 2
Survival of U251 glioblastoma cells irradiated by (a) 190.6 MeV proton beams in their Bragg peak position, (b) in plateau region, (c) by 6 MV or (d) 18 MV photons, in the absence (black) or presence of natBSH (red) or 10BSH (green) at a concentration corresponding to 40 ppm natB or 10B, respectively. Symbols depict mean survival values from 3 independent experiments, error bars show standard errors of the mean, and lines are linear-quadratic fits to the data. Stars highlight significant differences between survival curves without and with boron (* p < 0.05; **p < 0.01; *** p < 0.001; not marked: not significant, p > 0.05).
