Of patients EGFR mutation positive, the most common mutations were exon 19 Deletions and L858R in 71 (51.45%) and 53 (38.41%) patients, respectively; exon 20 Insertions, G719X, T790M, S768I, and L861Q mutations occurred in 5 (3.62%), 3 (2.17%), 3 (2.17%), 3 (2.17%) and 1 (0.72%) patients, respectively.