Lung cancer is the uncontrolled growth of abnormal cells in one or both lungs. These irregular cells do not carry out the purposes of normal lung cells and do not grow into strong lung tissue. As they develop, the abnormal cells can form tumors and obstruct with the working of the lung, which delivers oxygen to the body through blood.
There are two major types of lung cancer,
- Non-small cell lung cancer (NSCLC)
- Small cell lung cancer (SCLC).
Staging lung cancer is grounded on if the cancer is local or has spread from the lungs to the lymph nodes or other organs. Lungs are large, tumors can grow in them for a long time before they are found. Even when symptoms, such as coughing and fatigue, do occur, people think they are due to other causes. For this reason, early-stage lung cancer (stages I and II) is difficult to detect.
Lung cancer occurs from uncontrolled growth of tissues in the lungs mainly due to the carcinogenic components.
It may initiate from the cell lining of the bronchi and other parts of the lungs like bronchi-oles and alveoli.
Among all the cancers diagnosed, lung cancer accounts for about 13% and about 1 out of each 5 deaths caused by cancer are the result of lung cancer. Thus Worldwide it represents about 20% deaths.
In the 19th century. Lung cancer was considered a rare disease but in the 20th century it became one of the leading cause of deaths worldwide. Thus, lung cancer became the second most commonly occurring cancer both in Male and female, prostate cancer in men and breast cancer in women being the first.
In the First World war, free packets of cigarettes were distributed among the soldiers, and then tobacco smoking became a sign of fashion played its role really well in increasing the prevalence and mortality of lung cancer in the whole world. Now, 90% of the lung cancers are caused by smoking.
The survival rate of lung cancer is quite low as it is diagnosed in very later stages, but if it is diagnosed in the early stages the results may be otherwise.
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