“…Competitive binding of cetuximab to EGFR prevents ligand-induced tyrosine kinase activation and induces receptor downregulation. In clinical trials, cetuximab is active in colorectal cancer (Rosenberg et al, 2002;Cunningham et al, 2004;Folprecht et al, 2004;Lenz et al, 2004;Rougier et al, 2004;Saltz et al, 2004) and in concomitant treatment with radiotherapy in head and neck cancer (Bonner et al, 2006). Upregulation of cell-surface EGFR by bortezomib was indicated in earlier studies and recently reported in squamous-cell cancer lines (Lorch et al, 2007).…”