Lung Cancer

Topics: Lung cancer, Cancer, Squamous cell carcinoma Pages: 3 (852 words) Published: October 17, 2010
My project is about lung cancer, which falls under the science branch of oncology. Lung cancer is the uncontrolled growth of abnormal cells in the lung. The uncontrolled reproduction of cells results in the formation of tumors that can block or compress airways and displace or damage normal lung tissue. This can make the lung stop functioning as it should. Most lung cancers start in the lining of the bronchi, or in glands below the lining of the bronchi, frequently in the periphery of the lungs. When they are exposed to irritants or carcinogens, the epithelium continually replaces itself until the cells develop chromosomal changes and become altered in size, shape, and organization. These dysplastic cells don't function well as protectors, so underlying tissue gets exposed to irritant and carcinogens. Eventually, these dysplastic cells turn into a tumor and start invading deeper tissue.

This would make most lung cancers malignant, which means that they invade and destroy the healthy tissues around them and can spread throughout the body. The tumors can spread to nearby lymph nodes or through the bloodstream to other organs. This process is called metastasis. When lung cancer spreads, the tumor in the lung is called the primary tumor, and the tumors in other parts of the body are called secondary tumors or metastatic tumors.

There are two main types of lung cancer: small cell lung cancer and non-small cell lung cancer. Small cell lung cancer, which is also called oat cell cancer, is less common than non-small cell lung cancer. This type of lung cancer usually starts in one of the larger breathing tubes, grows fairly rapidly, and is likely to be large by the time of diagnosis. Small cell lung cancer accounts for about 20 percent of all lung cancers. Non-small cell lung cancer is much more common, and usually grows and spreads more slowly than small cell lung cancer. There are 3 types of non-small cell lung cancer which are Squamous cell carcinoma,...
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