Lung cancer is one of the most common cancers in the world. It is a leading cause of cancer death in men and women in the United States. Cigarette smoking causes most lung cancers. The more cigarettes you smoke per day and the earlier you started smoking, the greater your risk of lung cancer. High levels of pollution, radiation and asbestos exposure may also increase risk.
Common symptoms of lung cancer include
A cough that doesn't go away and gets worse over time
Constant chest pain
Coughing up blood
Shortness of breath, wheezing, or hoarseness
Repeated problems with pneumonia or bronchitis
Swelling of the neck and face
Loss of appetite or weight loss
There are many types of lung cancer. Each type of lung cancer grows and spreads in different ways and is treated differently. Treatment also depends on the stage, or how advanced it is. Treatment may include chemotherapy, radiation and surgery.
Your lungs are a pair of large organs in your chest. They are part of your respiratory system.
Air enters your body through your nose or mouth. It passes through your windpipe (trachea) and through each bronchus, and goes into your lungs.
When you breathe in, your lungs expand with air. This is how your body gets oxygen.
When you breathe out, air goes out of your lungs. This is how your body gets rid of carbon dioxide.
Your right lung has three parts (lobes). Your left lung is smaller and has two lobes.
Inside the chest are two thin layers of tissue (the pleura). One layer covers the lungs and the other layer lines the inside of your chest.
Cancer begins in cells, the building blocks that make up all tissues and organs of the body, including the lungs.
Normal cells in the lungs and other parts of the body grow and divide to form new cells as they are needed. When normal cells grow old or get damaged, they die, and new cells take their place.
Sometimes, this process goes wrong. New cells form when the body does not need them, and old or damaged cells do not die as they should. The buildup of extra cells often forms a mass of tissue called a growth or tumor.
Tumors in the lung can be benign (not cancer) or malignant (cancer):
Are rarely a threat to life
Do not invade the tissues around them
Do not spread to other parts of the body
Usually do not need to be removed
Malignant tumors (lung cancer):
May be a threat to life
Can invade nearby organs and tissues
Can spread to other parts of the body
Often can be removed but may grow back
Lung cancer cells can spread by breaking away from a lung tumor. They can travel through blood vessels or lymph vessels to reach other parts of the body. After spreading, cancer cells may attach to other tissues and grow to form new tumors that may damage those tissues.
When lung cancer spreads from its original place to another part of the body, the new tumor has the same kind of abnormal cells and the same name as the primary (original) tumor. For example, if lung cancer spreads to the bones, the cancer cells in the bones are actually lung cancer cells. The disease is metastatic lung cancer, not bone cancer. For that reason, it is treated as lung cancer, not bone cancer.
Types of Lung Cancer
In 2012, more than 226,000 Americans will be diagnosed with lung cancer.
The most common types are named for how the lung cancer cells look under a microscope:
Small cell: The cells of small cell lung cancer look small under a microscope. About 1 of every 8 people with lung cancer has small cell lung cancer.
Non-small cell: The cells of non-small cell lung cancer are larger than the cells of small cell lung cancer. Most (about 7 of every 8) people diagnosed with lung cancer have non-small cell lung cancer. It does not grow and spread as fast as small cell lung cancer, and it is treated differently.
After you learn that you have lung cancer, you may need staging tests to help with decisions about treatment. Staging tests can show the stage (extent) of lung cancer, such as whether cancer cells have spread to other parts of the body.
When lung cancer spreads, cancer cells are often found in nearby lymph nodes. Lung cancer cells can spread from the lung to almost any other part of the body, such as the brain, bones, other lung, liver, or adrenal glands.
Staging tests may include...
CT scan: An x-ray machine linked to a computer takes a series of detailed pictures of your chest, abdomen, brain, or other parts of your body. You’ll receive contrast material by injection into a blood vessel in your arm or hand. For a CT scan of the abdomen, you may receive contrast material by mouth also. The contrast material makes abnormal areas easier to see. The pictures from a CT scan can show the lung tumors size. The pictures can also show cancer that has spread to your liver, adrenal glands, brain, or other organs.
PET scan: Your doctor may use a PET scan to get a better view of the tumor in the lung or to find cancer that has spread. You will receive an injection of a small amount of radioactive sugar. A machine makes computerized pictures of the sugar being used by cells in the body. Because cancer cells use sugar faster than normal cells, areas with cancer cells look brighter on the pictures.
MRI: A strong magnet linked to a computer is used to make detailed pictures of your head or spine. An MRI can show whether cancer has spread to these areas. Sometimes contrast material is used to make abnormal areas show up more clearly on the picture.
Bone scan: A small amount of a radioactive substance will be injected into a blood vessel. The radioactive substance travels through your bloodstream and collects in the bones. A machine called a scanner detects and measures the radiation. The scanner makes pictures of your bones. Because higher amounts of the radioactive substance collect in areas where cancer is present, the pictures can show cancer that has spread to the bones. Other tests may be needed. For example, your doctor may remove samples of lymph nodes or other tissues to see whether lung cancer has spread.
The stage of lung cancer depends mainly on...
The size of the lung tumor
How deeply the tumor has invaded nearby tissue, such as the chest wall
Whether lung cancer cells have spread to lymph nodes or other parts of the body
Stages of Non-small Cell Lung Cancer.
Doctors describe the stages of non-small cell lung cancer using the Roman numerals I, II, III, and IV. Stage I is early-stage cancer, and Stage IV is advanced cancer that has spread to other parts of the body, such as the bones.
Occult Stage Lung Tumor
Tumor cells are found in sputum, but CT scans and other imaging tests don't show a lung tumor.
Stage 0 Lung Tumor
Abnormal cells are found only in the innermost lining of the lung. The tumor has not grown through this lining. A Stage 0 tumor is also called carcinoma in situ. It is not an invasive cancer.
Stage I Lung Cancer
The lung tumor is an invasive cancer. It has grown through the innermost lining of the lung into deeper lung tissue. The tumor is surrounded by normal tissue, and it doesn't invade nearby tissues, such as the chest wall.
The tumor is no more than 5 centimeters (about 2 inches) across. Cancer cells are not found in nearby lymph nodes.
Stage II Lung Cancer
The lung tumor is smaller than 7 centimeters across, and cancer cells are found in nearby lymph nodes.
Or, cancer cells are not found in nearby lymph nodes. The lung tumor is more than 5 centimeters across, or it invades nearby tissues, such as the chest wall, diaphragm, pleura, main bronchus, or tissue that surrounds the heart. More than one malignant tumor may be found within the same lobe of the lung.
Stage III Lung Cancer
The tumor may be any size. More than one malignant tumor may be found within the lung.
Cancer cells may be found in lymph nodes on either side of the chest or the neck. The tumor may have invaded nearby organs, such as the heart, esophagus, or trachea.
Stage IV Lung Cancer
Malignant tumors are found in both lungs. Or, the lung cancer has spread to other parts of the body, such as the brain, bones, liver, or adrenal glands. Or, cancer cells are found in fluid between the two layers of pleura. (See picture of pleura.)
Stages of Small Cell Lung Cancer
Most doctors describe the stages of small cell lung cancer with two stages:
Limited stage: Cancer is found only on one side of the chest.
Extensive stage: Cancer is found in the lung and also in tissues on the other side of the chest. Or, lung cancer is found in distant organs, such as the brain, or in fluid between the two layers of pleura. (See picture of pleura.) Instead of limited and extensive stage, some doctors describe the stages of small cell lung cancer using the Roman numerals I, II, III, and IV. (See Stages of Non-small Cell Lung Cancer above.)
The treatment that's right for you depends mainly on the type and stage of lung cancer. You may receive more than one type of treatment. At any stage of lung cancer, care is available to control pain and manage breathing problems, to relieve the side effects of treatment, and to ease emotional concerns.
Doctors Who Treat Lung Cancer
Your health care team can describe your treatment options, the expected results of each option, and the possible side effects. Because cancer treatments often damage healthy cells and tissues, side effects are common. These side effects depend on many factors, including the type of treatment. Side effects may not be the same for everyone, and they may even change from one treatment session to the next. You and your health care team can work together to develop a treatment plan.
Lung cancer is hard to control with current treatments. For that reason, many doctors encourage people with this disease to consider taking part in a research study (clinical trial) of new treatment methods. Research studies are an important option for people with any stage of lung cancer.
Before starting treatment, you might want a second opinion about your diagnosis and treatment options. Some people worry that the doctor will be offended if they ask for a second opinion. Usually the opposite is true. Most doctors welcome a second opinion. And many health insurance companies will pay for a second opinion if you or your doctor requests it. Some insurance companies actually require a second opinion.
If you get a second opinion, the second doctor may agree with your first doctor's diagnosis and treatment recommendation. Or, the second doctor may suggest another approach. Either way, you have more information and perhaps a greater sense of control. You can feel more confident about the decisions you make, knowing that you've looked at all of your options.
It may take some time and effort to gather your medical records and see another doctor. In most cases, it's not a problem to take several weeks to get a second opinion. The delay in starting treatment usually will not make treatment less effective. To make sure, you should discuss this delay with your doctor. Some people with lung cancer need treatment right away. For example, a doctor may advise a person with small cell lung cancer not to delay treatment more than a week or two.
Surgery may be an option for people with early-stage lung cancer.
The surgeon usually removes only the part of the lung that contains cancer. Most people who have surgery for lung cancer will have the lobe of the lung that contains the cancer removed. This is a lobectomy. In some cases, the surgeon will remove the tumor along with less tissue than an entire lobe, or the surgeon will remove the entire lung. The surgeon also removes nearby lymph nodes.
After lung surgery, air and fluid will collect in the chest. A chest tube that was inserted during surgery will allow the fluid to drain. Also, a nurse or respiratory therapist will teach you coughing and breathing exercises. You'll need to do these exercises several times a day. The chest tube will be removed a few days after surgery.
The time it takes to heal after surgery is different for everyone. Your hospital stay may be a week or longer. It may be several weeks before you return to normal activities.
Medicine can help control your pain after surgery. Before surgery, you should discuss the plan for pain relief with your doctor or nurse. After surgery, your doctor can adjust the plan if you need more pain relief.
Questions you may want to ask your doctor about surgery
What kind of surgery do you suggest for me?
How will I feel after surgery?
If I have pain, how can we control it?
How long will I be in the hospital?
Will I have any lasting side effects?
When can I get back to my normal activities?
Radiation therapy is an option for people with any stage of lung cancer:
People with early lung cancer may choose radiation therapy instead of surgery.
After surgery, radiation therapy can be used to destroy any cancer cells that may remain in the chest.
In advanced lung cancer, radiation therapy may be used with chemotherapy.
Radiation therapy can be used to help shrink a tumor that is blocking the airway.
Radiation therapy can be used to help relieve pain from lung cancer that has spread to the bones or other tissues.
Radiation therapy is often used to treat lung cancer that has spread to the brain.
The radiation comes from a large machine. The machine aims high-energy rays at your body to kill cancer cells. The treatment affects cells only in the area being treated, such as the chest area.
You'll go to a hospital or clinic for treatment. Treatments are usually 5 days a week for about 6 weeks. Each treatment session usually lasts less than 20 minutes.
Although radiation therapy is painless, it may cause other side effects. The side effects depend mainly on how much radiation is given and the part of your body that is treated. Ask your health care team to describe the side effects that you might expect during or after radiation therapy.
Radiation therapy aimed at the chest may cause a sore throat, cough, or shortness of breath. When you try to swallow, you may feel a lump in your throat or burning in your chest or throat. Your health care team can suggest ways to manage these problems. The problems usually go away when treatment ends.
It's common for the skin in the chest area to become red and dry and to get darker. Sometimes the skin may feel tender or itchy. Check with your doctor before using lotion or cream on your chest. After treatment is over, the skin will heal.
You're likely to become tired during radiation therapy, especially in the later weeks of treatment. Although getting enough rest is important, most people say they feel better when they exercise every day. Try to go for a short walk, do gentle stretches, or do yoga.
Questions you may want to ask your doctor about radiation therapy
When will treatment start? When will it end? How often will I have treatments?
How will I feel during treatment? Will I be able to drive myself to and from treatment?
What can I do to take care of myself before, during, and after treatment?
How will we know the treatment is working?
What side effects should I expect? What should I tell you about?
Are there any lasting effects?
Chemotherapy may be used alone, with radiation therapy, or after surgery.
Chemotherapy uses drugs to kill cancer cells. The drugs for lung cancer are usually given directly into a vein (intravenously) through a thin needle.
You'll probably receive chemotherapy in a clinic or at the doctor's office. People rarely need to stay in the hospital during treatment.
The side effects depend mainly on which drugs are given and how much. Chemotherapy kills fast-growing cancer cells, but the drugs can also harm normal cells that divide rapidly:
Blood cells: When drugs lower the levels of healthy blood cells, you're more likely to get infections, bruise or bleed easily, and feel very weak and tired. Your health care team will check for low levels of blood cells. If your levels are low, your health care team may stop the chemotherapy for a while or reduce the dose of the drug. There are also medicines that can help your body make new blood cells.
Cells in hair roots: Chemotherapy may cause hair loss. If you lose your hair, it will grow back after treatment, but the color and texture may be changed.
Cells that line the digestive tract: Chemotherapy can cause a poor appetite, nausea and vomiting, diarrhea, or mouth and lip sores. Your health care team can give you medicines and suggest other ways to help with these problems. Other possible side effects include hearing loss, joint pain, and tingling or numbness in your hands and feet.
When radiation therapy and chemotherapy are given at the same time, the side effects may be worse.
Your health care team can suggest ways to control many of these problems. Most go away when treatment ends
People with non-small cell lung cancer that has spread may receive a type of treatment called targeted therapy. Several kinds of targeted therapy are used for non-small cell lung cancer. One kind is used only if a lab test on the cancer tissue shows a certain gene change. Targeted therapies can block the growth and spread of lung cancer cells.
Depending on the kind of drug used, targeted therapies for lung cancer are given intravenously or by mouth. The drug enters the bloodstream and can affect cancer cells all over the body.
During treatment, your health care team will watch you for side effects. You may get a skin rash, diarrhea, or mouth sores, or you may feel very tired. Other possible side effects include shortness of breath, belly pain, high blood pressure, vomiting, and swollen feet and hands. The side effects usually go away after treatment ends.
Questions you may want to ask your doctor about chemotherapy or targeted therapy
Which drug or drugs do you suggest for me? What will they do?
What are the possible side effects? What can we do about them?
When will treatment start? When will it end? How often will I have treatments?
How will we know the treatment is working?
Will there be lasting side effects?
Eating well is important before, during, and after cancer treatment. You need the right amount of calories to maintain a good weight. You also need enough protein to keep up your strength. Eating well may help you feel better and have more energy.
Sometimes, especially during or soon after treatment, you may not feel like eating. You may be uncomfortable or tired. You may find that foods don't taste as good as they used to. In addition, poor appetite, nausea, vomiting, mouth blisters, and other side effects of treatment can make it hard for you to eat.
Your doctor, a registered dietitian, or another health care provider can suggest ways to help you meet your nutrition needs. Also, the NCI booklet Eating Hints has many useful recipes and lists of foods that can help with side effects.
Follow Up Care
You'll need regular checkups (such as every 6 months) after treatment for lung cancer. Checkups help ensure that any changes in your health are noted and treated if needed. If you have any health problems between checkups, contact your doctor
Lung cancer may come back after treatment. Your doctor will check for the return of cancer. It may return in the chest or it may return in another part of the body, such as the bones.
Checkups also help detect health problems that can result from cancer treatment.
Checkups may include a physical exam, blood tests, or CT scans.