Lung Cancer Pictures Biography
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Lung cancer is a disease in which the cells of the lung tissues grow uncontrollably and form tumors. It is the leading cause of death from cancer among both men and women in the United States. The American Cancer Society (ACS) estimated that in 1998, at least 172,000 new cases of lung cancer were diagnosed, and that lung cancer accounted for 28% of all cancer deaths, or approximately 160,000 people. In 2002, the ACS reported that more than 150,000 Americans die from the disease every year. Only 15 percent of people with lung cancer will live five years.
Description
Types of lung cancer
There are two kinds of lung cancers, primary and secondary. Primary lung cancer (also called adenocarcinoma) starts in the lung itself. Primary lung cancer is divided into small cell lung cancer and non-small cell lung cancer, depending on how the cells look under the microscope. Secondary lung cancer is cancer that starts somewhere else in the body (for example, the breast or colon) and spreads to the lungs.
Small cell cancer was formerly called oat cell cancer, because the cells resemble oats in their shape. About one-fourth of all lung cancers are small cell cancers. This type is a very aggressive cancer and spreads to other organs within a short time. It generally is found in people who are heavy smokers. Non-small cell cancers account for the remaining 75% of lung cancers. They can be further subdivided into three categories.
Incidence of lung cancer
Lung cancer is rare among young adults. It usually is found in people who are 50 years of age or older, with an average age at diagnosis of 60. While the incidence of the disease is decreasing among Caucasian men, it is steadily rising among African-American men, and among both Caucasian and African-American women. This change probably is due to the increase in the number of smokers in these groups. In 1987, lung cancer replaced breast cancer as the number one cancer killer among women.
Causes & symptoms
Causes
SMOKING. Tobacco smoking is the leading cause of lung cancer. Ninety percent of lung cancers can be prevented by completely giving up tobacco. Smoking marijuana cigarettes is considered yet another risk factor for cancer of the lung. These cigarettes have a higher tar content than tobacco cigarettes. In addition, they are inhaled very deeply; as a result, the smoke is held in the lungs for a longer period of time.
EXPOSURE TO ASBESTOS AND TOXIC CHEMICALS. Repeated exposure to asbestos fibers, either at home or in the workplace, also is considered a risk factor for lung cancer. Studies show that compared to the general population, asbestos workers are seven times more likely to die from lung cancer. Asbestos workers who smoke increase their risk of developing lung cancer by 50-100 times. Besides asbestos, mining industry workers who are exposed to coal products or radioactive substances, such as uranium, and workers exposed to chemicals, such as arsenic, vinyl chloride, mustard gas , and other carcinogens, also have a higher than average risk of contracting lung cancer.
ENVIRONMENTAL CONTAMINATION. High levels of a radioactive gas (radon) that cannot be seen or smelled pose a risk for lung cancer. This gas is produced by the breakdown of uranium, and does not present any problem outdoors. In the basements of some houses that are built over soil containing natural uranium deposits, however, radon may accumulate and reach dangerous levels. Having one's house inspected for the presence of radon gas when buying or renting is a good idea. Other forms of environmental pollution (e.g., auto exhaust fumes) also may slightly increase the risk of lung cancer.
In 2002, a study in the Journal of the American Medical Association (JAMA) linked for the first time long-term exposure to fine-particle air pollution to lung cancer deaths. The risk of death from lung cancer increased substantially for people living in the most heavily polluted metropolitan areas. Tiny particles from the air pollution emitted from coal-fired power plants, factories and diesel vehicles are to blame.
CHRONIC LUNG INFLAMMATION AND SCARRING . Inflammation and scar tissue sometimes are produced in the lung by diseases, such as silicosis and berylliosis, which are caused by inhalation of certain minerals, tuberculosis , and certain types of pneumonia . This scarring may increase the risk of developing lung cancer.
FAMILY HISTORY. Although the exact cause of lung cancer is not known, people with a family history of lung cancer appear to have a slightly higher risk of contracting the disease. In 2003, researchers were continuing work aimed at learning why some smokers were more susceptible to lung cancer than others. They discovered a type of DNA repair characteristic apparent in smokers who were less likely to get lung cancer. Continued work along these lines could lead to possible screening for DNA that makes some people at higher risk for lung cancer.
Lung Cancer Pictures
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Lung Cancer Pictures
Sign Ribbon cells Horoscope Symbol Tattoos Research Zodiac Sign Ribbon Tattoos
Lung Cancer Pictures
Sign Ribbon cells Horoscope Symbol Tattoos Research Zodiac Sign Ribbon Tattoos
Lung Cancer Pictures
Sign Ribbon cells Horoscope Symbol Tattoos Research Zodiac Sign Ribbon Tattoos
Lung Cancer Pictures
Sign Ribbon cells Horoscope Symbol Tattoos Research Zodiac Sign Ribbon Tattoos
Lung Cancer Pictures
Sign Ribbon cells Horoscope Symbol Tattoos Research Zodiac Sign Ribbon Tattoos
Lung Cancer Pictures
Sign Ribbon cells Horoscope Symbol Tattoos Research Zodiac Sign Ribbon Tattoos
Lung Cancer Pictures
Sign Ribbon cells Horoscope Symbol Tattoos Research Zodiac Sign Ribbon Tattoos
Lung Cancer Pictures
Sign Ribbon cells Horoscope Symbol Tattoos Research Zodiac Sign Ribbon Tattoos
Lung Cancer Pictures
Sign Ribbon cells Horoscope Symbol Tattoos Research Zodiac Sign Ribbon Tattoos
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