Contraindications and relative contraindications to lung cancer chemotherapy 1. Patients with lung cancer with KPS<60 or ECOG>2 should not be treated with chemotherapy. 2.Lung cancer patients with white blood cells less than 3.0×109/L, neutrophils less than 1.5×109/L, platelets less than 6×1010/L, red blood cells less than 2×1012/L, and hemoglobin less than 8.0g/dl should not be treated with chemotherapy in principle. 3.Lung cancer patients with abnormal liver and kidney functions, whose laboratory indexes exceed two times the upper limit of normal values, or those with serious complications and fever of infection and bleeding tendency should not be treated with chemotherapy. 4.Consideration should be given to stop or change the regimen if the following conditions occur in chemotherapy (1) If the lesion progresses after 2 cycles of treatment or deteriorates during the rest period of the chemotherapy cycle, the original regimen should be stopped and other regimens should be selected as appropriate. (2) When adverse reactions to chemotherapy reach grade 3-4 and pose a significant threat to the patient’s life, the drug should be discontinued and the next treatment should be switched to another regimen. (3) If serious complications occur, the drug should be discontinued and the next treatment should be switched to another regimen.