EGFR mutation analysis will be done on extracted DNA with real-time polymerase chain reaction to estimate the prevalence of EGFR mutation in adenocarcinoma of the lung. All data were entered in a Microsoft Excel sheet (Redmond, WA, USA) and statistical analysis will be performed using SPSS statistics for Windows, Version 22.0 (IBM Corp., Armonk, NY). The gene discussed is EGFR; the disease is lung adenocarcinoma.