In an attempt to identify these potential mediators of recurrence, we used an antibody array to analyse phospho-RTK levels in primary and recurrent tumour lysates and focused on candidates with relatively high fluorescence intensities, specifically epidermal growth factor receptor (EGFR), ErbB2 and platelet-derived growth factor receptor (PDGFR) β (Additional file 6: Figure S6A). This evidence concerns the gene ERBB2 and neoplasm.