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            Cancer is not one disease, there are many types of cancer, and we actually have over 100 types of cancer that scientists discovered, what is cancer? Cancer means the uncontrolled growth of abnormal cells called tumors. There are two forms of tumors: the beginning tumors are not cancerous, the other cancerous tumors, this type invade our normal tissues and disrupt our body function. We agree that cancer is danger disease but if we adopt the right therapy we can get well of it. The major kinds of cancer are lung cancer, breast cancer, prostate cancer, colon cancer. In this paper, i will talk about one kind of these cancers: the lung cancer. I treat of its causes, its symptoms, its types of therapy and the new medical technology used in this case.
             What is lung cancer?.
             Lung cancer is the controlled growth of abnormal cells in the lung. Lung cancer develops when the genetic material responsible for production of lung cells is damaged when those cells formed tumors that block air passages in the lung and make it stop functioning as it should. Researchers have discovered that there are certain genes that are not replicated in the lung cells of smokers. It's known as gene deletion. It's especially prevalent in youth smokers. The research indicates that young smokers. The research indicates that young smokers are more sensitive to genetic damage in their lungs from tobacco smoke.
             Symptoms Lung Cancer:.
             There are many symptoms of lung cancer .Some are related to others not respiratory system. The symptoms related to the respiratory system are: the nagging cough is one of the more common symptoms and is likely to happen when a tumor is large and blocks on air passage. Another symptom is chest shoulder back pain which feels likes a constant ache that may or may not be related to coughing. Other symptoms may include shortness of breath, fatigue, weight loss, coughing up blood, unexplained weakness in the legs, or swelling of the neck and face.

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