Small molecule EGFR-tyrosine kinase inhibitors (EGFR-TKI) targeting EGFR have been used in the clinical treatment of NSCLC, and positron emission tomography/computed tomgraphy (PET/CT) imaging can noninvasively monitor the expression and mutation status of EGFR in patients with NSCLC. This evidence concerns the gene EGFR and non-small cell lung carcinoma.