Lung cancer is a common lung cancer, the mortality rate of cancer mortality in the first account. Most originated in the bronchial epithelium of lung cancer.
In recent years, as smoking and environmental factors, particularly in industrial countries around the world, lung cancer incidence and mortality are rising rapidly, died of lung cancer in male patients has been the first place.Several risk factors of lung cancer:
Five causes of lung cancer:
(A) a large number of investigations based on information on smoking lung cancer and smoking cigarettes cause very close relationship. Increased incidence of lung cancer and cigarettes were paralleled an increase in sales. Cigarettes contain benzopyrene and other carcinogens. Inhalation of cigarette smoke or animals can be induced respiratory smear tar and skin cancer. The habit of smoking lung cancer incidence rate 10 times higher than non-smokers, smoking, a higher incidence of large quantity, 20 times higher than non-smokers. Female patients the incidence of lung cancer increased significantly. Clinically diagnosed cases of lung cancer, cigarette smoking more than 20 cigarettes per day, which lasted more than 30 years, accounting for about 80%. 20 ~ 30 years, smoking is very serious, nearly 3 million people are smoking, male smoking rate of nearly 50% of adult women nearly 5%, and there are many young smokers, if not take the necessary measures to control, discourage smoking, the next 10 to 30 years, China will further increase the incidence of lung cancer. Long-term smoking can lead to proliferation of bronchial epithelial cells, squamous epithelial Health, induced squamous cell carcinoma or undifferentiated small cell carcinoma. No Smoking habits were, though it may be suffering from lung cancer, but cancer is more common.
Several risk factors of lung cancer (b) air pollution a high incidence of lung cancer in industrialized countries, high urban than in rural areas, factories, mines area than residential high, mainly due to the developed areas of industry and transport, petroleum, coal combustion and internal combustion engines, etc. and asphalt roads generate dust containing carcinogenic benzopyrene, hydrocarbons and other harmful substances polluting the atmosphere related. Survey material shows high concentration of benzopyrene in the atmosphere region also increased the incidence of lung cancer. Air pollution and smoking cigarettes on the incidence of lung cancer may promote each other and from the synergy.
(C) occupational factors, long-term exposure has been recognized as uranium, radium and other radioactive materials and their derived properties, carcinogenic hydrocarbons, arsenic, chromium, nickel, copper, tin, iron, coal tar, asphalt, oil, asbestos, mustard gas and other substances, can induce lung cancer, mainly squamous cell carcinoma and undifferentiated small cell carcinoma.
(D) chronic lung diseases such as tuberculosis, silicosis, pneumoconiosis and lung cancer and other can co-exist. The high incidence of cases of cancer in healthy subjects. In addition chronic inflammation of the lung and bronchial pulmonary fibrosis scarring lesions in the healing process may lead to squamous metaplasia or hyperplasia, on this basis, some cases can develop into cancer.
Several risk factors of lung cancer (e) internal factors such as family, human genetics, and immune function of reduced metabolic activity, endocrine disorders, such as lung cancer may also play a role in promoting.