Lung cancer refers to all malignant tumors originating from the airway (including trachea and bronchus) or lung, accounting for the first place in the incidence of malignant tumors in China, which can cause symptoms such as cough, hemoptysis, chest pain, chest tightness, fever, fatigue, and emaciation, etc. Intermediate and late stage lung cancer often has distant metastasis.
Lung cancer is divided into stages I, II, III, and IV. Stages I and II are early, stage III is intermediate, also known as locally advanced, and stage IV is advanced.
The survival time of lung cancer patients is related to a variety of factors, including the type of cancer cells, the extent of metastasis, the treatment, and the patient’s psychological and nutritional status, in addition to the stage. Small-cell lung cancer is extremely malignant, and metastases to organs such as brain, bone, and kidney may occur in early stages. Survival is shorter than that of non-small-cell lung cancer, and the life expectancy of patients in the middle stage is hardly more than half a year, and the 2-year survival rate of patients in the late stage<10%, with most patients in the late stage hardly surviving more than 3 months; for non-small-cell lung cancer, the longest survival period for patients in the middle stage is about 2 years, and the longest survival period for patients in the late stage is hardly more than 1 The maximum survival of patients with non-small cell lung cancer is about 2 years, and the maximum survival of advanced patients is hardly more than 1 year.