cancer - How Cancers Develop and Spread Cancer develops...

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How Cancers Develop and Spread Cancer develops only in cells with damaged genes (mutations). Mutations can be inherited or caused by exposure to: Low-dose radiation Drugs Toxic chemicals Infection with certain viruses can cause mutations. Lifestyle plays a major role in cancer prevention.
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How Cancers Develop and Spread (continued) Cells that begin to grow abnormally but are not yet cancer cells, may form benign tumors . Benign tumors are surrounded by a fibrous capsule, and they do not spread or invade surrounding tissues. Benign tumors are usually not life-threatening unless they interfere with vital processes.
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Cancer Detection and Staging Cancer screening is an examination to detect cancer before a person has symptoms. American Cancer Society recommends screening for early detection, particularly for high-risk people or people with symptoms. Visual examination Self-examination Clinical (physician) examination Laboratory testing Scans (MRI, CAT)
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Lung Cancer Tobacco smoking is the leading cause of various cancers. 30% of cancer deaths, including 87% of lung cancer deaths, are attributed to tobacco use. Lung cancer is the leading cause of cancer deaths in the United States. Smoking cigarettes is most common cause. Women are more susceptible to lung cancer than men due to presence of the GRPR gene, which is linked to the abnormal growth of lung cells and is more active in women.
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Lung Cancer (continued) Signs and symptoms In the early stages, signs and symptoms may
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This note was uploaded on 09/08/2010 for the course HS 1 at San Jose State.

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cancer - How Cancers Develop and Spread Cancer develops...

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