Many genes, including epithelial growth factor receptor (EGFR), echinoderm microtubule-associated like 4-anaplastic lymphoma kinase (EML4-ALK), kirsten rat sarcoma viral oncogene homolog (KRAS), b-raf proto-oncogene serine/threonine-protein kinase (BRAF) and so on, were explored as functional driver genes in lung cancer [5, 6]. Here, KRAS is linked to lung cancer.