EGFR and neoplasm: Therapy of NSCLC with first generation small molecule EGFR kinase inhibitors, gefitinib and erlotinib, is severely limited by two main factors: first, the poor sensitivity to TKIs of tumor cells expressing wild type forms of the receptor [14-19]; second the emergence of drug resistance in virtually all tumors bearing EGFR mutations initially sensitive for the presence of either exon 19 deletions or exon 21 mutation L858R [21-23,38].