Doctors cannot always explain why one person gets cancer and another doesn't. However, scientists have studied general patterns of cancer in the population to learn what things around us and what things we do in our lives may increase our chance of developing cancer.
Anything that increases a person's chance of developing a disease is called a risk factor; anything that decreases a person's chance of developing a disease is called a protective factor. Some of the risk factors for cancer can be avoided, but many cannot. For example, although you can choose to quit smoking, you cannot choose which genes you have inherited from your parents. Both smoking and inheriting specific genes could be considered risk factors for certain kinds of cancer, but only smoking can be avoided. Prevention means avoiding the risk factors and increasing the protective factors that can be controlled so that the chance of developing cancer decreases.
Although many risk factors can be avoided, it is important to keep in mind that avoiding risk factors does not guarantee that you will not get cancer. Also, most people with a particular risk factor for cancer do not actually get the disease. Some people are more sensitive than others are to factors that can cause cancer. Talk to your doctor about methods of preventing cancer that might be effective for you.
Purposes of this summary on lung cancer
The purposes of this summary on lung cancer prevention are to:
- Give information on lung cancer and how often it occurs.
- Describe lung cancer prevention methods.
- Give current facts about which people or groups of people would most likely be helped by following lung cancer prevention methods.
You can talk to your doctor or health care professional about cancer prevention methods and whether they would be likely to help you.
Lung Cancer Prevention
The lungs are part of the respiratory system. Their function is to supply oxygen to the blood while removing carbon dioxide.
Lung cancer may spread to the lymph nodes or other tissues in the chest (including the other lung). In many cases, lung cancer may also spread to other organs of the body, such as the bones, brain, or liver.
Significance of lung cancer
Lung cancer is the leading cause of cancer deaths in U.S. men and women.
Lung cancer prevention
Lung cancer can often be associated with known risk factors for the disease. Many risk factors are modifiable though not all can be avoided.
- Tobacco: Studies show that smoking tobacco products in any form is the major cause of lung cancer. People who stop smoking and never start again lower their risk of developing lung cancer or of having lung cancer recur (come back). Many products, such as nicotine gum, nicotine sprays, nicotine inhalers, nicotine patches, or nicotine lozenges, may be helpful to people trying to quit smoking, as well as antidepressant drugs. In addition, a number of efforts at the community, state, and national level have helped to reduce smoking rates.
Second-hand tobacco smoke also causes lung cancer. This is smoke that comes from a burning cigarette or other tobacco product, or smoke that is exhaled by smokers. People who inhale second-hand smoke are exposed to the same cancer-causing agents as smokers, although in weaker amounts. Inhaling second-hand smoke is called involuntary or passive smoking.
- Environmental Causes: There are other causes of lung cancer in the environment, but their effect on lung cancer rates is small compared to the effect of cigarette smoking.
- Cancer-causing agents that may be found indoors, especially in the workplace, include asbestos, radon , arsenic, chromium, nickel, tar and soot. These substances can cause lung cancer in never-smokers, and combine with cigarette smoke to further increase lung cancer risk in smokers. Many countries are working to control these cancer-causing agents in the workplace.
- Air pollution may also increase the risk of lung cancer. Studies show that lung cancer rates are higher in cities with higher levels of air pollution.
- Beta Carotene: Studies show that heavy smokers who avoid taking beta carotene supplements may avoid further increasing their risk of lung cancer compared with smokers who do take beta carotene.
- Diet and Physical Activity: Studies show that a diet rich in fruit, and possibly vegetables, may help lower the risk of lung cancer, while heavy alcohol drinking may increase the risk of lung cancer. In addition, studies show that people who are physically active may have a lower risk of lung cancer than those who are not, even after taking cigarette smoking into account.
- Chemoprevention: Chemoprevention is the use of specific natural or man-made drugs to reverse, suppress, or prevent cancer growth. Chemoprevention is an area of active clinical research. It has not yet become standard therapy.
Source: National Cancer Institute, www.cancer.gov
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