What is lung cancer
[转贴 2007-10-13 09:46:13]
Lung cancer is a common cancer of the lungs, the vast majority of lung cancer in bronchial epithelial origin, in recent years, with smoking and environmental factors, countries in the world especially the industrialized countries, lung cancer incidence and mortality are rising rapidly, died of cancer in male patients have lung cancer Habitat first. According to the Shanghai Cancer statistics, in the case of male cancer, lung cancer incidence rates increased dramatically, ranking No. 1. The distribution of lung cancer than right lung left lung, than on the lower lobe of. Origin of the main bronchus and lung lobe bronchus called central lung cancer. Origin of the segmental bronchi of the distal lung cancer in the lung around the site, known as peripheral lung cancer. The vast majority of lung cancer in bronchial epithelial origin, but a few cancer in alveolar epithelial origin or bronchial glands. Tumor growth in the process of governance on the one hand extended bronchial wall expansion, and penetrated through the bronchial wall adjacent lung tissue mass, resulting into the bronchial lumen stenosis or occlusion. Further development of disseminated tumor can spread directly from the lung invasive chest wall, mediastinum, heart, vascular and other neighboring tube; The blood lymphatic metastasis to other parts of the body or spread to other respiratory lobe. The growth rate of tumor proliferation and metastasis of tumors depend on the way the histological type, degree of differentiation and biological characteristics.
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