Lung cancer biomarker refers to the objective evaluation and determination of certain characteristic biochemical indicators in the pathological or therapeutic process of lung cancer. They mainly include antigenic markers, enzymes and molecular biomarkers. 1. Antigenic markers: including carcinoembryonic antigen, squamous cell carcinoma-associated antigen, cytokeratin 19 fragment, glycoprotein antigen 125 and so on. 2. Enzymes: including neuron-specific enolase, glutathione-S-transferase-TT, aryl hydroxylase, telomerase, and so on. 3. molecular biology markers: p53 gene, KRAS gene, p16 gene, etc.. All of the above are common clinical lung cancer biomarker tests. Checking lung cancer biomarkers can be helpful for identification, diagnosis, prevention and monitoring in the course of treatment. If you have any uncomfortable symptoms, you should go to the hospital in time and consult your physician for guidance.