Generally, lung cancer does not develop in one year. Lung cancer is the result of many factors and long time action, such as living in the harmful chemical environment for a long time, which stimulates the lung mucous membrane cells and leads to their proliferation, malignant change and finally lung cancer. Clinically, most of lung cancers are formed between several years to ten years, and seldom form in one year. However, the development of lung cancer is relatively fast after diagnosis, and some patients with hypofractionated lung cancer will enter the advanced stage in only 2 to 3 months. Therefore, after discovery, it is necessary to take timely treatment by means of surgery, radiotherapy, chemotherapy, and targeted therapy to control the disease effectively, so as to avoid its continuous deterioration, which may endanger the life.