Expression of Bax and Bcl-2 following WBRT. The Bax/Bcl-2 ratio in the WBRT hippocampus was increased, compared with the control (P=0.001) and nimodipine groups (P=0.016) on day 7 after brain radiation. WBRT, whole brain radiotherapy; Bcl-2, B-cell lymphoma 2; Bax, Bcl-2-associated X protein. *P<0.05, vs. WBRT.