肺癌

Causes the formation of lung cancer still is not entirely clear, there are a lot of data indicate that lung cancer risk factors, including smoking and second-hand smoke, asbestos, radon, arsenic, ionizing radiation, halogen vinyl, polycyclic aromatic compounds, and nickel. As follows:
(A) Smoking
The long-term smoking can lead to proliferation of bronchial epithelial cells squamous epithelium squamous cell carcinoma or non-health-induced differentiation of small cell lung cancer, non-smoking habits were suffering from lung cancer, but though it may be more common adenocarcinoma., Carcinogenic substances in cigarettes when burned, release .
(B) air pollution
(C) occupational factors
Long-term exposure uranium-radium and other radioactive substances and their derivatives carcinogenic hydrocarbons, chromium-nickel-copper-arsenic-tin-iron coal tar pitch oil substances such as asbestos, mustard gas can induce lung cancer was mainly squamous cell carcinoma and undifferentiated small cell carcinoma.
(D) chronic lung diseases such as tuberculosis, silicosis, pneumoconiosis, etc., the coexistence of these cases with lung cancer, the incidence of cancer is higher than normal addition, chronic pulmonary inflammation and pulmonary fibrosis bronchial lesions in the healing process of scar may lead to squamous metaplasia or hyperplasia in some patients on this basis can be developed into cancer.
(5) Human intrinsic factors such as family history, as well as reduce the metabolic activity of the immune function of endocrine dysfunction, etc.