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Thursday, April 30, 2009

Lung cancer - major factors

Lung cancer mainly on the occurrence of lung cancer smoking, occupational (in close contact with asbestos, radon gas, mustard gas, polycyclic aromatic hydrocarbons compounds, chlorine ether, chromium, nickel, inorganic arsenic compounds, as well as radiation, etc.), air pollution (the air pollution contains a large number of motor vehicle exhaust, burning waste) factors. There are other factors: dietary vitamin A and other analogues (vitamin A) in the content related to the occurrence of lung cancer, chronic lung diseases (such as chronic bronchitis, pulmonary tuberculosis), genetic factors.

The incidence of lung cancer is very complex factors. However, the two major factors ca be summarized as below:

First, environmental carcinogens factors.
With industrial development, air pollution has become a major problem, such as nitrosamines, asbestos, chrome, nickel, mustard gas, arsenic, bitumen, oil and other emissions…… spread in the air, the water enters the human body has become an important factor carcinogenic ;

Second, the individual factors to smoking is the most important factor.
Smoking index greater than 400 and obviously the incidence of lung cancer, smoking index for smoke daily count by the number of years of smoking. Some scholars study, smokers than non-smokers of lung cancer 8.8 times the rate. Tobacco-specific carcinogenic substances containing N-nitroso drop smoke pH, it is a Central nitrosamines, after activation, can be carcinogenic substances, carcinogenic mutations performance.

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