Figure 3. Apoptosis, senescence and vascularity of the tumors were assessed by TUNEL, SA-β-galactosidase and CD31 staining, respectively.

A) Representative photographs of TUNEL, β-galactosidase and CD31 staining of control or radiation treated MDA-MB-231 tumors. B) Significantly increased cell apoptosis and senescence were observed for tumors treated with radiation (* p<0.05). Lower MVD was observed for the treated tumors but the difference was not significant.