Lung cancer is the number one tumor with high morbidity and mortality. The expert consensus on chemoradiotherapy for lung cancer is introduced for patients to facilitate their discretion and analysis in practice: I. Under what circumstances chemotherapy is needed after surgery 1. Stage IIa or above, as long as there are lymph node metastasis, or tumor >7cm, chemotherapy is needed regardless of whether it is cut cleanly or not. 2.Stage Ib, as long as the surgery is not clean, chemotherapy should be given. Even if the tumor is clean, as long as it has high-risk factors, chemotherapy should be given. What are the high-risk factors? They include hypofractionated carcinoma (including neuroendocrine tumor), invasion of vasculature, deeded resection, tumor >4cm, and invasion of dirty pleura. 3.Stage Ia is generally not chemotherapy. If it is not cut cleanly, supplemental radiotherapy can be considered without chemotherapy. 4.The time of chemotherapy is usually about one month after surgery. 1.Regardless of the stage, as long as the surgery is not cut cleanly, supplemental radiotherapy is needed. 2.Stage IIIa or above, regardless of whether it is cut cleanly or not, need to supplement radiotherapy. Chemoradiotherapy for small cell lung cancer Generally, chemotherapy is necessary without surgical treatment. If the tumor is very limited, it can be combined with radiotherapy if necessary. Chemotherapy in advanced stage or recurrence Generally, chemotherapy is needed. CT is reviewed every 2 cycles to evaluate the efficacy. If necessary, palliative radiotherapy can be given. The efficiency of chemotherapy is 25%~35%. If it is effective, the tumor stabilization time is 4-6 months, median survival time is 8-10 months, 1-year survival rate is 30%-40%, 2-year survival rate is 10-15%. V. General knowledge about chemotherapy 1. The prerequisite for chemotherapy is that the patient should be in good physical condition, basically take care of himself and can participate in daily activities, otherwise he cannot benefit from chemotherapy. 2. If the first chemotherapy is ineffective, the efficiency of the replacement program is even lower, less than 10%. After surgery, if the tumor recurs more quickly, the efficacy of chemotherapy again is poor. 3.The staging of lung cancer, for those with advanced recurrence, can be analyzed from CT examination. For the latter, the doctor will usually write it down in the discharge certificate. 4. The pathology report after surgery is very important, which includes the size of tumor, the indication of cutting edge, as long as the cutting edge is positive, it is not cut cleanly, the expression of gene, the pathological differentiation, the invasion of vasculature or not, and the degree of lymph node metastasis. The family members must make copies of the pathology report sheet.