Out of 399 NSCLC specimens, 144 cases were scored 0 (in which 10 cases harbored EGFR mutations and the rate of mutations in this category was 6.94%, 10/144); 104 cases were scored 1+ (there were 24 cases of EGFR mutations and the rate of mutation was 23.08%, 24/104); 103 cases were scored 2+ (EGFR mutations were present in 70 cases and the rate of mutations was 67.96%, 70/103); 48 cases were scored 3+ (48 cases harbored EGFR mutations, and the rate of mutation was 100%, 48/48). Here, EGFR is linked to non-small cell lung carcinoma.