EGFR and non-small cell lung carcinoma: Abbreviations: CEA = carcinoembryonic antigen, CT = computed tomography, DDP = cisplatin, DTX = docetaxel, EGFR = epidermal growth factor receptor, EGFR-TKI = epidermal growth factor receptor-tyrosine kinase inhibitor, MRI = magnetic resonance imaging, NSCLC = non-small cell lung cancer, PEM = pemetrexed, PFS = progression-free survival, PR = partial remission.