Fig 1. Effect of radiation on tumor cell migration as assessed by the Boyden chamber migration assay.

Representative images are shown of migrating C6 glioma cells exposed to conditioned medium from cultures of A. unirradiated or heavy ion-irradiated, or B. unirradiated or X-ray-irradiated glioma cells. C. Quantification of the number of migratory glioma cells is expressed as means ± standard error of the mean from three independent experiments, in which treatments were performed in triplicate.*P<0.05, ***P<0.001 vs. controls (0 Gy).