[High-risk group--lung cancer]

Carcinogenesis of the lung cancer may have possibly many factors because that lung has been always exposed many extrinsic materials. Investigation of risk factor and recognition of high-risk group of lung cancer possess much important meaning, approached not only carcinogenesis of the lung but also clinical diagnosis and treatment of lung cancer. In this report, risk factors that established hitherto, air pollution, occupation, smoking habit and co-existing other lung disease are reviewed as high-risk groups of lung cancer.