Introduction
Lung cancer has remained the leading cause of cancer deaths in both men and women in United States. According to International Agency for Research on Cancer (IARC), approximately 1.35 million new cases of lung cancer are diagnosed across the world each year. There are a wide number of risk factors associated with lung cancer. These are smoking, exposure to asbestos, silica exposure, and diesel exhaust. The most common cause is the exposure to tobacco smoke through either active or passive smoking. Males are at a higher risk of lung cancer than females, a ratio of 7.8 to 5.8 respectively. There are five ...