Targeted therapy for lung cancer mainly uses drugs that specifically bind to specific targets of tumor cells to cause apoptosis of tumor cells, and this treatment mainly targets tumor cells without killing normal cells. The first step in choosing targeted therapy is to test the patient’s genes to see if there are any relevant genetic mutations and then select the appropriate targeted drug for treatment. Genetic mutations occur mainly in non-small cell lung cancer patients, especially in non-squamous non-small cell lung cancer patients. drugs. Therefore, genetic testing is routinely recommended for non-small cell lung cancer, especially for non-squamous non-small cell lung cancer, to clarify the presence or absence of genetic mutations.