Lung cancer is caused by what is it?

The exact cause of lung cancer has outstanding knowledge. After years of extensive investigation and research, is currently recognized as the cause of the following factors closely linked with lung cancer.

(A) Smoking

In accordance with national survey data All this shows that a large number of lung cancer etiology and the relationship between cigarette smoking is extremely close. The incidence of lung cancer growth and an increase in cigarette sales was a parallel relationship. Cigarettes contain benzopyrene and other carcinogenic substances, experimental animals, inhalation of cigarette smoke or smearing tar can induce respiratory and skin cancer. Smoking habit of lung cancer incidence rate 10 times higher than non-smokers, smoking and the incidence of large quantities were higher, 20 times higher than non-smokers. Of this century, Western European countries with an increasing number of women smokers, female patients of lung cancer incidence rates increased significantly.

The clinical diagnosis of lung cancer cases, more than 20 cigarettes a day smoking cigarettes, which lasted for more than 30 years, accounting for more than 80%. For nearly 20 years of smoking in China is very serious, nearly 3 billion people are smokers. Beijing, Tianjin, Shanghai and other major cities in the adult male smoking rate nearly 50% of women nearly 5%, and there are many young smokers. Failure to take the necessary measures to control, discourage smoking, then the next 10 to 30 years, lung cancer incidence rate in China is bound to grow further. The long-term smoking can lead to bronchial epithelial hyperplasia, squamous epithelium of Health, induced differentiation of squamous cell carcinoma or small cell carcinoma. No smoke, whilst also suffering from lung cancer, but cancer is more common.

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(B) air pollution

Industrialized countries, a high incidence of lung cancer in urban than in rural areas, factories, mines and areas higher than the residential area, mainly due to industrial and transportation developed areas, oil, coal and other internal combustion engine after combustion, and asphalt roads generate dust containing benzopyrene-induced carcinoma of hydrocarbons and other harmful substances polluting the atmosphere. Investigation materials shows high concentration of benzopyrene in the atmosphere of the region, increased the incidence of lung cancer. Air pollution and smoke cigarettes on lung cancer incidence rate is likely to promote each other, since synergy.

(C) occupational factors

30s of the last century European literature, there is a high incidence of lung cancer Schneeberg mines reported. After many years of investigation and research, is now recognized as long-term exposure of uranium, radium and other radioactive substances and their derivatives, 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 disease

Such as tuberculosis, silicosis, pneumoconiosis, etc., and lung cancer coexist. These cases the incidence of cancer is higher than normal. In addition, lung inflammation and pulmonary fibrosis with chronic bronchial scarring lesions, in the healing process may lead to squamous metaplasia, or hyperplasia, on this basis, some cases can develop into cancer.

● to explore the relationship between pulmonary tuberculosis and lung cancer

(5) Human intrinsic factor

Such as family history, as well as reduced immune function, metabolic activity, endocrine dysfunction, such as the incidence of lung cancer may also play some role in promoting.

(Vi) Other common factors

Kitchen fumes and women, a clear relationship between the occurrence of lung cancer. In addition, the catering industry catering personnel of lung cancer incidence rate than the general career high, often cooking in the kitchen cooking than those who rarely mortality rate of lung cancer nearly one-fold, and often those who suffer from cooking in the kitchen, and even much higher risk of lung cancer was not often in the kitchen cooking smokers. The reason is mostly caused due to cooking habits, it is no exaggeration to say that cooking fumes has become a threat to our lives and health of the "invisible killer."