Introduction
Lung cancer is the uncontrolled growth of abnormal cells that starts in one of the lungs or both. In most cases, the cells develop in the air passages. The cells divide rapidly forming tumors, which may grow to extremely large sizes making it difficult to supply the oxygen to the bloodstream. There are tumors that remain in one place and do not spread, which are well known as benign tumors. There are malignant tumors, which are more dangerous as they easily spread to other body parts. When the cancer disaster spreads further, it may become extremely difficult to treat.
Literature review
...