Comprehensive pharmacogenetic profiling of the epidermal growth factor receptor pathway for biomarkers of response to, and toxicity from, cetuximab by Madi, A, Fisher, D, Maughan, TS, Colley, JP, Meade, AM, Tejpar, S, Van Den Bosch, B, Maynard, J, Humphreys, V, Wasan, H, Adams, RA, Idziaszczyk, S, Harris, R, Kaplan, RS, Cheadle, JP