Akt activation is a common event in pediatric malignant gliomas and a potential adverse prognostic marker: a report from the Children's Oncology Group. - Pollack IF; Hamilton RL; Burger PC; Brat DJ; Rosenblum MK; Murdoch GH; Nikiforova MN; Holmes EJ; Zhou T; Cohen KJ; Jakacki RI (Journal of neuro-oncology, 2010)