AZD2171???

Hello there. I`m from Bulgaria. My father is 44 and his diagnose is also Glioblastoma IV. The operation was on 26 of March 2007. Now we are doing the radiotherapy. We are not taking any pills with that therapy. There is some cells left after the operation. In Internet i saw medicines called AZD2171 and Iressa that could help to reduce bad cells. Could you tell me some more information?