Study of the correlation of EGFR and K-RAS gene mutations with its protein expression in non-small cell lung cancer

Objective To investigate gene mutations of epidermal growth factor receptor (EGFR) and K-RAS (Kirsten rat sarcoma viral oncogene) in Chinese patients with non-small cell lung cancer (NSCLC), and study the correlation with its protein expression and its clinical significance on gefitinib.