2. Lung cancer occurs in bronchial epithelium, and the incidence of lung cancer has increased significantly in the past 50 years. In industrialized countries in Europe and America and some industrial cities in China, the incidence of lung cancer has ranked first among male malignant tumors, and it has also increased rapidly among women, accounting for the second or third place among common malignant tumors of women. Lung cancer has become a major disease endangering life and health.
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