[Detection and Analysis of EGFR and KRAS Mutations 
in the Patients with Lung Squamous Cell Carcinomas].

backgroundActivating mutations in epidermal growth factor receptor (EGFR) and KRAS are important markers in non-small cell lung cancer. However, EGFR and KRAS gene mutations in lung squamous cell carcinoma are rarely reported. The aim of this study was to analyze EGFR and KRAS gene mutation rate and their relationship with clinical features in patients with lung squamous cell carcinomas.

methodsA total of 139 patients undergoing treatment for naïve lung squamous cell carcinomas with tumor tissue samples available for testing were recruited. EGFR and KRAS mutation statuses of the tumor samples were detected using a mutant enriched liquid chip.

resultsOf the 139 cases of lung squamous cell carcinoma, EGFR mutations were detected in 25 cases (18%), KRAS mutations were detected in 7 cases (5%), and the presence of both EGFR and KRAS mutations was detected in 1 case (0.7%). EGFR mutations occurred more often in females than in males (33.3% vs 16.5%) and in patients that never smoked than in those who smoke (29.6% vs 16.1%). However, the difference did not reach statistical significance (P>0.05). No significant differences were observed in age, stage, and different biopsy type. KRAS mutations occurred more often in males than in females (5.5% vs 0%), but the difference did not reach statistical significance (P>0.05). No significant differences were observed in age, stage, different biopsy type, and smoking status (P>0.05).

conclusionsEGFR and KRAS mutations were low in lung squamous cell carcinomas, and had no significant correlation with clinical features. Before using tyrosine kinase inhibitor targeted therapy, EGFR and KRAS mutations should be detected in patients with lung squamous cell carcinomas.