肺癌是我国常见的恶性肿瘤之一,其发病率有逐年上升的趋势,严重威胁着人民的健康和安全.当前防治肺癌的迫切任务就是要做到三早(早期发现、早期诊断、早期治疗).肺癌大多起源于支气管上皮的储备细胞.发源于大支气管者因其位置靠近肺门称中心型肺癌;起源于小支气管者位于肺的周 Lung cancer is one of the most common malignancies in China. Its incidence rate is increasing year by year, which seriously threatens people’s health and safety. The urgent task for prevention and treatment of lung cancer is to do three mornings (early detection, early diagnosis and early treatment). Most lung cancers originate from the reserve cells of the bronchial epithelium. Those originating from large bronchi are called central lung cancer because of their location close to the hilum; those originating in the small bronchi are located in the week of the lung.