What is prevention?
Cancer prevention is action taken to lower the chance of getting cancer. By preventing cancer, the number of new cases of cancer in a group or population is lowered. Hopefully, this will lower the number of deaths caused by cancer.
To prevent new cancers from starting, scientists look at risk factors and protective factors. Anything that increases your chance of developing cancer is called a cancer risk factor; anything that decreases your chance of developing cancer is called a cancer protective factor.
Some risk factors for cancer can be avoided, but many cannot. For example, both smoking and inheriting certain genes are risk factors for some types of cancer, but only smoking can be avoided. Regular exercise and a healthy diet may be protective factors for some types of cancer. Avoiding risk factors and increasing protective factors may lower your risk but it does not mean that you will not get cancer.
Different ways to prevent cancer are being studied, including:
- Changing lifestyle or eating habits.
- Avoiding things known to cause cancer.
- Taking medicines to treat a precancerous condition or to keep cancer from starting.
General Information About Lung Cancer
Lung cancer is a disease in which malignant (cancer) cells form in the tissues of the lung.
The lungs are a pair of cone-shaped breathing organs in the chest. The lungs bring oxygen into the body as you breathe in. They release carbon dioxide, a waste product of the body’s cells, as you breathe out. Each lung has sections called lobes. The left lung has two lobes. The right lung is slightly larger and has three lobes. A thin membrane called the pleura surrounds the lungs. Two tubes called bronchi lead from the trachea (windpipe) to the right and left lungs. The bronchi are sometimes also involved. Tiny air sacs called alveoli and small tubes called bronchioles make up the inside of the lungs.
There are two types: small cell and non-small cell.
Lung cancer is the leading cause of cancer death in both men and women.
More people die from lung cancer than from any other type of cancer. It is the second most common cancer in the United States, after skin cancer. The number of new cases and deaths is highest in black men.
Lung Cancer Prevention
Avoiding risk factors and increasing protective factors may help prevent lung cancer.
Avoiding cancer risk factors may help prevent certain cancers. Risk factors include smoking, being overweight, and not getting enough exercise. Increasing protective factors such as quitting smoking and exercising may also help prevent some cancers. Talk to your doctor or other health care professional about how you might lower your risk of cancer.
The following are risk factors for lung cancer:
Cigarette, cigar, and pipe smoking
Tobacco smoking is the most important risk factor for lung cancer. Cigarette, cigar, and pipe smoking all increase the risk of lung cancer. Tobacco smoking causes about 9 out of 10 cases in men and about 8 out of 10 cases in women.
Studies have shown that smoking low tar or low nicotine cigarettes does not lower the risk of lung cancer.
Studies also show that the risk of lung cancer from smoking cigarettes increases with the number of cigarettes smoked per day and the number of years smoked. People who smoke have about 20 times the risk compared to those who do not smoke.
Being exposed to secondhand tobacco smoke is also a risk factor for lung cancer. Secondhand smoke is the smoke that comes from a burning cigarette or other tobacco product, or that is exhaled by smokers. People who inhale secondhand smoke are exposed to the same cancer -causing agents as smokers, although in smaller amounts. Inhaling secondhand smoke is called involuntary or passive smoking.
Having family history is a risk factor for lung cancer. People with a relative who has had lung cancer may be twice as likely to get the disease as people who do not have a relative who has had lung cancer. Because cigarette smoking tends to run in families and family members are exposed to secondhand smoke, it is hard to know whether the increased risk is from the family history or from being exposed to cigarette smoke.
Being infected with the human immunodeficiency virus (HIV), the cause of acquired immunodeficiency syndrome (AIDS), is linked with a higher risk of lung cancer. People infected with HIV may have more than twice the risk than those who are not infected. Since smoking rates are higher in those infected with HIV than in those not infected, it is not clear whether the increased risk is from HIV infection or from being exposed to cigarette smoke.
Environmental risk factors
- Radiation exposure: Being exposed to radiation is a risk factor for lung cancer. Atomic bomb radiation, radiation therapy, imaging tests, and radon are sources of radiation exposure:
- Atomic bomb radiation: Being exposed to radiation after an atomic bomb explosion increases the risk.
- Radiation therapy: Radiation therapy to the chest may be used to treat certain cancers, including breast cancer and Hodgkin lymphoma. Radiation therapy uses x-rays, gamma rays, or other types of radiation that may increase the risk. The higher the dose of radiation received, the higher the risk. The risk following radiation therapy is higher in patients who smoke than in nonsmokers.
- Imaging tests: Imaging tests, such as CT scans, expose patients to radiation. Low-dose spiral CT scans expose patients to less radiation than higher dose CT scans. In lung cancer screening, the use of low-dose spiral CT scans can lessen the harmful effects of radiation.
- Radon: Radon is a radioactive gas that comes from the breakdown of uranium in rocks and soil. It seeps up through the ground, and leaks into the air or water supply. Radon can enter homes through cracks in floors, walls, or the foundation, and levels of radon can build up over time.
Studies show that high levels of radon gas inside the home or workplace increase the number of new cases and the number of deaths caused by lung cancer. The risk is higher in smokers exposed to radon than in nonsmokers who are exposed to it. In people who have never smoked, about 30% of deaths caused by lung cancer have been linked to being exposed to radon.
- Workplace exposure: Studies show that being exposed to the following substances increases the risk of lung cancer:
- Tar and soot.
These substances can cause lung cancer in people who are exposed to them in the workplace and have never smoked. As the level of exposure to these substances increases, the risk also increases. The risk is even higher in people who are exposed and also smoke.
- Air pollution: Studies show that living in areas with higher levels of air pollution increases the risk of lung cancer.
Beta carotene supplements in heavy smokers
Taking beta carotene supplements (pills) increases the risk of lung cancer, especially in smokers who smoke one or more packs a day. The risk is higher in smokers who have at least one alcoholic drink every day.
The following are protective factors for lung cancer:
The best way to prevent lung cancer is to not smoke.
Smokers can decrease their risk of lung cancer by quitting. In smokers who have been treated for lung cancer, quitting smoking lowers the risk of new lung cancers. Counseling, the use of nicotine replacement products, and antidepressant therapy have helped smokers quit for good.
In a person who has quit smoking, the chance of preventing lung cancer depends on how many years and how much the person smoked and the length of time since quitting. After a person has quit smoking for 10 years, the risk decreases 30% to 50%.
Lower exposure to workplace risk factors
Laws that protect workers from being exposed to cancer-causing substances, such as asbestos, arsenic, nickel, and chromium, may help lower their risk of developing lung cancer. Laws that prevent smoking in the workplace help lower the risk caused by secondhand smoke.
Lower exposure to radon
Lowering radon levels may lower the risk of lung cancer, especially among cigarette smokers. High levels of radon in homes may be reduced by taking steps to prevent radon leakage, such as sealing basements.
It is not clear if the following decrease the risk of lung cancer:
Some studies show that people who eat high amounts of fruits or vegetables have a lower risk of lung cancer than those who eat low amounts. However, since smokers tend to have less healthy diets than nonsmokers, it is hard to know whether the decreased risk is from having a healthy diet or from not smoking.
Some studies show that people who are physically active have a lower risk of lung cancer than people who are not. However, since smokers tend to have different levels of physical activity than nonsmokers, it is hard to know if physical activity affects the risk of lung cancer.
The following do not decrease the risk of lung cancer:
Beta carotene supplements in nonsmokers
Studies of nonsmokers show that taking beta carotene supplements does not lower their risk of lung cancer.
Vitamin E supplements
Studies show that taking vitamin E supplements does not affect the risk of lung cancer.