Furthermore, the article summarizes the implications and future prospects of using molecular testing in the field of NSCLC with focus on EGFR mutations, KRAS mutation, EML4-ALK fusion gene detection, and EGFR expression..     ///    This article discusses in detail the significance of first-line and second-line epidermal growth factor receptor tyrosine kinase inhibitors (EGFR-TKIs) and inhibitors of the vascular endothelial growth factor receptor (VEGFR) and EML4-ALK. 