Further classification analysis of these data showed that the mutations in EGFR exons in non-small cell lung cancer patients were mainly located in 19/28 (35.98%), 21/28 (32.40%), 20/28 (7.79%), 18/28 (7.01%), and mixed mutations between the four (Figure 3A). The gene discussed is EGFR; the disease is non-small cell lung carcinoma.