In Canada, lung cancer is the leading cause of death from cancer for both men and women.
The majority of lung cancers start in the bronchi, which are the airways that lead to the lungs. There are different types of lung cancer. The most common is called non-small cell lung cancer, which includes adenocarcinoma, large cell carcinoma, and squamous cell carcinoma. The other type of lung cancer is small cell carcinoma (or oat cell carcinoma).
Each type grows at a different rate and responds differently to treatment. Cancer that has spread from other parts of the body to the lungs is also common.
Smoking is the main risk factor for lung cancer. In Canada, it is responsible for more than 70% of lung cancers. The longer you have smoked and the more you smoke, the more likely you are to get lung cancer. If you stop smoking before cancer cells develop, lung tissue that has been damaged by smoking will start to repair. An ex-smoker’s risk will not be as low as that of a person who never smoked, but over time, their risk will go down. Cigar smoking and pipe smoking are almost as likely to cause lung cancer as cigarette smoking.
Even second-hand smoke, the kind inhaled from nearby smokers, can cause lung cancer. Worldwide, non-smokers who are married to smokers have a 30% greater risk of developing lung cancer than spouses of non-smokers.
Living in an environment with high air pollution or working with radioactive minerals or asbestos can also increase the risk of cancer. Research has helped us to understand how these risk factors produce certain changes in the DNA of lung cells. These changes cause the cells to grow abnormally and form cancers.
DNA is the genetic material that carries the instructions for nearly everything our cells do. Some genes (parts of our DNA) contain instructions for controlling when cells grow and divide. The risk factors discussed earlier can trigger changes, also called mutations, in these genes that result in cancer. A risk for some types of cancer (e.g., breast, ovarian, colorectal, and several others) can be inherited from parents. However, inherited gene mutations are not thought to be a cause of very many lung cancers.
Lung cancer can be managed with surgery, radiation therapy, and chemotherapy, either alone or in combination, depending on how advanced the tumour has developed. Which treatment or combination of treatment that is best will depend on the type of lung cancer, how advanced the cancer is (i.e., the stage of the cancer), overall health, side effects, and the potential for curing the cancer, relieving symptoms, or prolonging life.
Surgery can only be done if the cancerous tumour is small and localized to one lung, and if the remaining lung is strong enough to work on its own. The surgery is called a pneumonectomy if the whole lung is removed, or a lobectomy if only part of the lung is removed. The doctor decides how much of the lung to remove during the surgery. Surgery doesn’t always cure the cancer: only around 25% of all lung cancer surgeries are successful. Surgery is only recommended for people in good enough health with no sign of metastatic spread of the tumour. If a person has a serious heart or other lung condition, surgery may not be an option.
Radiation is used for lung cancer that has spread or is too close to the windpipe. For people with serious disease, radiation is used to keep the cancer from growing, rather than to destroy it entirely. Radiation can control bone pain, superior vena cava syndrome and compression of the nerves to the backbone (spinal cord) caused by cancerous cell growth.
Chemotherapy, which is treatment with anticancer medications, may be used to prolong life when lung cancer is metastatic (spread to other areas of the body), or chemotherapy in combination with radiation may be used to control lung cancer that is still contained within the chest. Recently, molecularly targeted therapy has been found to extend survival rates in some patients with metastatic cancer.
The highest chance for a cure is in those people where the lung cancer was found and surgically removed or treated in its early stages. The estimated 5-year survival rate for all stages of lung cancer in Canadians is 19% for men, and 26% for women. However, if the cancer has spread outside of the chest, it’s not usually curable.
It’s important for people who have had lung cancer to have regular checkups. Some people who have had lung cancer surgically removed will get it again. The figure is even higher for those who keep smoking after the surgery. Prevention of lung cancer is possible; deciding to quit smoking is the first big step. There are many helpful techniques and treatments for smoking cessation; see our article on this topic.
All material copyright MediResource Inc. 1996 – 2025. Terms and conditions of use. The contents herein are for informational purposes only. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Source: www.medbroadcast.com/condition/getcondition/Lung-Cancer
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