Characteristics of epidemiology, etiology and molecular biology of lung cancer in nonsmokers

Smoking is the leading cause of lung cancer, while efforts to study the disease in nonsmokers have been limited. The proportion of lung cancer in nonsmokers is increasing with the successful implementation of tobacco control. Current study indicates that there are striking differences in the epidemiological,clinical and molecular characteristics of lung cancer between nonsmokers and smokers,suggesting that they are separate entities. Key words: Lung cancer;  Smoking;  Epidemiology