Multi-center randomized phase II study comparing cediranib plus gefitinib with cediranib plus placebo in subjects with recurrent/progressive glioblastoma by Brown, N, McBain, C, Nash, S, Hopkins, K, Sanghera, P, Saran, F, Phillips, M, Dungey, F, Clifton-Hadley, L, Wanek, K, Krell, D, Jeffries, S, Khan, I, Smith, P, Mulholland, P