Figure 4. VEGF and MMP-2 and -9 protein concentration in conditioned media from cultures of irradiated tumor cells.

C6 glioma cell culture supernatant was collected 24-ray irradiation, and protein levels were measured by ELISA. Data represent the mean ± standard error of the mean from six independent experiments. *P<0.05, **P<0.01, ***P<0.001 vs. controls (0 Gy).