Masonic Cancer Center, University of Minnesota
Non-small cell 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. Two
tubes called bronchi lead from the
trachea (windpipe) to the right and
left lungs. The bronchi are sometimes also involved in lung cancer. Tiny air sacs called alveoli and small tubes called
bronchioles make up the inside of
the lungs.
Anatomy of the respiratory system, showing the trachea and both lungs and their lobes and airways. Lymph nodes and the diaphragm are also shown. Oxygen is inhaled into the lungs and passes through the thin membranes of the alveoli and into the bloodstream (see inset).
A thin membrane called the pleura covers the outside of each lung and lines the inside wall of the chest cavity. This creates a sac called the pleural cavity. The pleural cavity normally contains a small amount of fluid that helps the lungs move smoothly in the chest when you breathe.
There are two main types of lung cancer: non-small cell lung cancer and small cell lung cancer.
See the following PDQ summaries for more information about lung cancer:
There are several types of non-small cell lung cancer.
Each type of non-small cell lung cancer has different kinds of cancer cells. The cancer cells of each type grow and spread in different ways. The types of non-small cell lung cancer are named for the kinds of cells found in the cancer and how the cells look under a microscope:
Other less common types of non-small cell lung cancer are: pleomorphic, carcinoid tumor, salivary gland carcinoma, and unclassified carcinoma.
Smoking can increase the risk of developing non-small cell lung cancer.
Smoking cigarettes, pipes, or cigars is the most common cause of lung cancer. The earlier in life a person starts smoking, the more often a person smokes, and the more years a person smokes, the greater the risk. If a person has stopped smoking, the risk becomes lower as the years pass.
Anything that increases a person's chance of developing a disease is called a risk factor. Having a risk factor does not mean that you will get cancer; not having risk factors doesn't mean that you will not get cancer. People who think they may be at risk should discuss this with their doctor. Risk factors for lung cancer include the following:
When smoking is combined with other risk factors, the risk of developing lung cancer is increased.
Possible signs of non-small cell lung cancer include a cough that doesn't go away and shortness of breath.
Sometimes lung cancer does not cause any symptoms and is found during a routine chest x-ray. Symptoms may be caused by lung cancer or by other conditions. A doctor should be consulted if any of the following problems occur:
Tests that examine the lungs are used to detect (find), diagnose, and stage non-small cell lung cancer.
Tests and procedures to detect, diagnose, and stage non-small cell lung cancer are often done at the same time. The following tests and procedures may be used:

X-ray of the chest. X-rays are used to take pictures of organs and bones of the chest. X-rays pass through the patient onto film.

PET (positron emission tomography) scan. The patient lies on a table that slides through the PET machine. The head rest and white strap help the patient lie still. A small amount of radioactive glucose (sugar) is injected into the patient's vein, and a scanner makes a picture of where the glucose is being used in the body. Cancer cells show up brighter in the picture because they take up more glucose than normal cells do.

Lung biopsy. The patient lies on a table that slides through the computed tomography (CT) machine which takes x-ray pictures of the inside of the body. The x-ray pictures help the doctor see where the abnormal tissue is in the lung. A biopsy needle is inserted through the chest wall and into the area of abnormal lung tissue. A small piece of tissue is removed through the needle and checked under the microscope for signs of cancer.

Bronchoscopy. A bronchoscope is inserted through the mouth, trachea, and major bronchi into the lung, to look for abnormal areas. A bronchoscope is a thin, tube-like instrument with a light and a lens for viewing. It may also have a cutting tool. Tissue samples may be taken to be checked under a microscope for signs of disease.
Certain factors affect prognosis (chance of recovery) and treatment options.
The prognosis (chance of recovery) and treatment options depend on the following:
For most patients with non-small cell lung cancer, current treatments do not cure the cancer.
If lung cancer is found, taking part in one of the many clinical trials being done to improve treatment should be considered. Clinical trials are taking place in most parts of the country for patients with all stages of non-small cell lung cancer. Information about ongoing clinical trials is available from the NCI Web site (see also: clinical trials at the Masonic Cancer Center) .
After lung cancer has been diagnosed, tests are done to find out if cancer cells have spread within the lungs or to other parts of the body.
The process used to find out if cancer has spread within the lungs or to other parts of the body is called staging. The information gathered from the staging process determines the stage of the disease. It is important to know the stage in order to plan treatment. Some of the tests used to diagnose non-small cell lung cancer are also used to stage the disease. (See the General Information section.) Other tests and procedures that may be used in the staging process include the following:

Endoscopic ultrasound-guided fine-needle aspiration biopsy. An endoscope that has an ultrasound probe and a biopsy needle is inserted through the mouth and into the esophagus. The probe bounces sound waves off body tissues to make echoes that form a sonogram (computer picture) of the lymph nodes near the esophagus. The sonogram helps the doctor see where to place the biopsy needle to remove tissue from the lymph nodes. This tissue is checked under a microscope for signs of cancer.

Mediastinoscopy. A mediastinoscope is inserted into the chest through an incision above the breastbone to look for abnormal areas between the lungs. A mediastinoscope is a thin, tube-like instrument with a light and a lens for viewing. It may also have a cutting tool. Tissue samples may be taken from lymph nodes on the right side of the chest and checked under a microscope for signs of cancer. In an anterior mediastinotomy (Chamberlain procedure), the incision is made beside the breastbone to remove tissue samples from the lymph nodes on the left side of the chest.
There are three ways that cancer spreads in the body.
The three ways that cancer spreads in the body are:
When cancer cells break away from the primary (original) tumor and travel through the lymph or blood to other places in the body, another (secondary) tumor may form. This process is called metastasis. The secondary (metastatic) tumor is the same type of cancer as the primary tumor. For example, if breast cancer spreads to the bones, the cancer cells in the bones are actually breast cancer cells. The disease is metastatic breast cancer, not bone cancer.
The following stages are used for non-small cell lung cancer:
Occult (hidden) stage
In the occult (hidden) stage, cancer cells are found in sputum (mucus coughed up from the lungs), but no tumor can be found in the lung by imaging or bronchoscopy, or the primary tumor is too small to be checked.
Stage 0 (Carcinoma in Situ)
In stage 0, abnormal cells are found in the innermost lining of the lung. These abnormal cells may become cancer and spread into nearby normal tissue. Stage 0 is also called carcinoma in situ.
Stage I

Stage I non-small cell lung cancer. In stage IA, cancer is in the lung only. In stage IB, the cancer may do one or more of the following: (a) grow larger in the lung, (b) spread to the main bronchus of the lung, © spread to the innermost layer of the pleura that covers the lungs.
In stage I, cancer has formed. Stage I is divided into stages IA and IB:
Stage II

Stage II non-small cell lung cancer. In stage IIA, cancer has spread to lymph nodes on the same side of the chest as the cancer. In stage IIB, cancer is either the same as in stage IB and has also spread to lymph nodes on the same side of the chest; or cancer has not spread to lymph nodes but has spread to one or more of the following: (a) the chest wall, (b) the diaphragm, © the pleura between the lungs, (d) the membrane around the heart, and/or (e) the main bronchus.
Stage II is divided into stages IIA and IIB:
or
Stage IIIA

Stage IIIA non-small cell lung cancer. The cancer has spread to the lymph nodes on the same side of the chest as the cancer. It may also spread to one or more of the following: (a) the main bronchus, (b) the chest wall, © the diaphragm, (d) the pleura between the lungs, and/or (e) the pericardium (membrane around the heart).
In stage IIIA, cancer has spread to lymph nodes on the same side of the chest as the tumor. Also:
Stage IIIB

Stage IIIB non-small cell lung cancer. The cancer has spread to (a) lymph nodes above the collarbone or lymph nodes on the opposite side of the chest from the cancer, and/or it may also spread to one or more of the following: (b) the heart, © the inferior vena cava and the aorta, (d) the chest wall, (e) the diaphragm, (f) the trachea, and (g) the sternum or esophagus. Cancer may also spread to the fluid between the pleura (thin layers of tissue lining the lungs and chest cavity).
In stage IIIB, the tumor may be any size and has spread:
Stage IV

Stage IV non-small cell lung cancer. The cancer has spread to another lobe of the same lung, to the other lung, and/or to one or more other parts of the body.
In stage IV, cancer may have spread to lymph nodes and has spread to another lobe of the lungs or to other parts of the body, such as the brain, liver, adrenal glands, kidneys, or bone.
Recurrent non-small cell lung cancer is cancer that has recurred (come back) after it has been treated. The cancer may come back in the brain, lung, or other parts of the body.
There are different types of treatment for patients with non-small cell lung cancer.
Different types of treatments are available for patients with non-small cell lung cancer. Some treatments are standard (the currently used treatment), and some are being tested in clinical trials. A treatment clinical trial is a research study meant to help improve current treatments or obtain information on new treatments for patients with cancer. When clinical trials show that a new treatment is better than the standard treatment, the new treatment may become the standard treatment. Patients may want to think about taking part in a clinical trial. Some clinical trials are open only to patients who have not started treatment.
Nine types of standard treatment are used:
Surgery
Four types of surgery are used:

Wedge resection of the lung. Part of the lung lobe containing the cancer and a small amount of healthy tissue around it is removed.

Lobectomy. A lobe of the lung is removed.

Pneumonectomy. The whole lung is removed.
Even if the doctor removes all the cancer that can be seen at the time of the surgery, some patients may be given chemotherapy or radiation therapy after surgery to kill any cancer cells that are left. Treatment given after the surgery, to increase the chances of a cure, is called adjuvant therapy.
Radiation therapy
Radiation therapy is a cancer treatment that uses high-energy x-rays or other types of radiation to kill cancer cells or keep them from growing. There are two types of radiation therapy. External radiation therapy uses a machine outside the body to send radiation toward the cancer. Internal radiation therapy uses a radioactive substance sealed in needles, seeds, wires, or catheters that are placed directly into or near the cancer.
Radiosurgery is a method of delivering radiation directly to the tumor with little damage to healthy tissue. It does not involve surgery and may be used to treat certain tumors in patients who cannot have surgery.
The way the radiation therapy is given depends on the type and stage of the cancer being treated.
Chemotherapy
Chemotherapy is a cancer treatment that uses drugs to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. When chemotherapy is taken by mouth or injected into a vein or muscle, the drugs enter the bloodstream and can reach cancer cells throughout the body (systemic chemotherapy). When chemotherapy is placed directly into the spinal column, an organ, or a body cavity such as the abdomen, the drugs mainly affect cancer cells in those areas (regional chemotherapy). The way the chemotherapy is given depends on the type and stage of the cancer being treated.
Biologic therapy
Biologic therapy is a treatment that uses the patient's immune system to fight cancer. Substances made by the body or made in a laboratory are used to boost, direct, or restore the body's natural defenses against cancer. This type of cancer treatment is also called biotherapy or immunotherapy.
Laser therapy
Laser therapy is a cancer treatment that uses a laser beam (a narrow beam of intense light) to kill cancer cells.
Photodynamic therapy (PDT)
Photodynamic therapy (PDT) is a cancer treatment that uses a drug and a certain type of laser light to kill cancer cells. A drug that is not active until it is exposed to light is injected into a vein. The drug collects more in cancer cells than in normal cells. Fiberoptic tubes are then used to carry the laser light to the cancer cells, where the drug becomes active and kills the cells. Photodynamic therapy causes little damage to healthy tissue. It is used mainly to treat tumors on or just under the skin or in the lining of internal organs.
Cryosurgery
Cryosurgery is a treatment that uses an instrument to freeze and destroy abnormal tissue, such as carcinoma in situ. This type of treatment is also called cryotherapy.
Electrocautery
Electrocautery is a treatment that uses a probe or needle heated by an electric current to destroy abnormal tissue.
Watchful waiting
Watchful waiting is closely monitoring a patient's condition without giving any treatment until symptoms appear or change. This may be done in certain rare cases of non-small cell lung cancer.
New types of treatment are being tested in clinical trials.
This summary section describes treatments that are being studied in clinical trials. It may not mention every new treatment being studied. Information about clinical trials is available from the NCI Web site (see also: clinical trials at the Masonic Cancer Center) .
Chemoprevention
Chemoprevention is the use of drugs, vitamins, or other substances to reduce the risk of developing cancer or to reduce the risk cancer will recur (come back).
New combinations
New combinations of treatments are being studied in clinical trials.
Patients may want to think about taking part in a clinical trial.
For some patients, taking part in a clinical trial may be the best treatment choice. Clinical trials are part of the cancer research process. Clinical trials are done to find out if new cancer treatments are safe and effective or better than the standard treatment.
Many of today's standard treatments for cancer are based on earlier clinical trials. Patients who take part in a clinical trial may receive the standard treatment or be among the first to receive a new treatment.
Patients who take part in clinical trials also help improve the way cancer will be treated in the future. Even when clinical trials do not lead to effective new treatments, they often answer important questions and help move research forward.
Patients can enter clinical trials before, during, or after starting their cancer treatment.
Some clinical trials only include patients who have not yet received treatment. Other trials test treatments for patients whose cancer has not gotten better. There are also clinical trials that test new ways to stop cancer from recurring (coming back) or reduce the side effects of cancer treatment.
Clinical trials are taking place in many parts of the country. See the Treatment Options section that follows for links to current treatment clinical trials. These have been retrieved from NCI's clinical trials database.
Follow-up tests may be needed.
Some of the tests that were done to diagnose the cancer or to find out the stage of the cancer may be repeated. Some tests will be repeated in order to see how well the treatment is working. Decisions about whether to continue, change, or stop treatment may be based on the results of these tests. This is sometimes called re-staging.
Some of the tests will continue to be done from time to time after treatment has ended. The results of these tests can show if your condition has changed or if the cancer has recurred (come back). These tests are sometimes called follow-up tests or check-ups.
A link to a list of current clinical trials is included for each treatment section. For some types or stages of cancer, there may not be any trials listed. Check with your doctor for clinical trials that are not listed here but may be right for you.
Treatment of occult non-small cell lung cancer depends on where the cancer has spread. It can usually be cured by surgery.
Check for U.S. clinical trials from NCI's PDQ Cancer Clinical Trials Registry that are now accepting patients with occult non-small cell lung cancer (see also: clinical trials at the Masonic Cancer Center) . For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
Treatment of stage 0 may include the following:
Check for U.S. clinical trials from NCI's PDQ Cancer Clinical Trials Registry that are now accepting patients with stage 0 non-small cell lung cancer (see also: clinical trials at the Masonic Cancer Center) . For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
Treatment of stage I non-small cell lung cancer may include the following:
Check for U.S. clinical trials from NCI's PDQ Cancer Clinical Trials Registry that are now accepting patients with stage I non-small cell lung cancer (see also: clinical trials at the Masonic Cancer Center) . For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
Treatment of stage II non-small cell lung cancer may include the following:
Check for U.S. clinical trials from NCI's PDQ Cancer Clinical Trials Registry that are now accepting patients with stage II non-small cell lung cancer (see also: clinical trials at the Masonic Cancer Center) . For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
Treatment of stage IIIA non-small cell lung cancer that can be removed with surgery may include the following:
Treatment of stage IIIA non-small cell lung cancer that cannot be removed with surgery may include the following:
For more information about supportive care for symptoms including cough, shortness of breath, and chest pain, see the PDQ summary on Cardiopulmonary Syndromes.
Non-small cell lung cancer of the superior sulcus, often called Pancoast tumor, begins in the upper part of the lung and spreads to nearby tissues such as the ribs and vertebrae. Treatment of Pancoast tumors may include the following:
Some stage IIIA non-small cell lung tumors that have grown into the chest wall may be completely removed. Treatment of chest wall tumors may include the following:
Check for U.S. clinical trials from NCI's PDQ Cancer Clinical Trials Registry that are now accepting patients with stage III non-small cell lung cancer (see also: clinical trials at the Masonic Cancer Center) . For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
Treatment of stage IIIB non-small cell lung cancer may include the following:
For more information about supportive care for symptoms such as cough, shortness of breath, and chest pain, see the following PDQ summaries:
Check for U.S. clinical trials from NCI's PDQ Cancer Clinical Trials Registry that are now accepting patients with stage III non-small cell lung cancer (see also: clinical trials at the Masonic Cancer Center) . For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
Treatment of stage IV non-small cell lung cancer may include the following:
For more information about supportive care for symptoms including cough, shortness of breath, and chest pain, see the following PDQ summaries:
Check for U.S. clinical trials from NCI's PDQ Cancer Clinical Trials Registry that are now accepting patients with stage IV non-small cell lung cancer (see also: clinical trials at the Masonic Cancer Center) . For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
Treatment of recurrent non-small cell lung cancer may include the following:
Check for U.S. clinical trials from NCI's PDQ Cancer Clinical Trials Registry that are now accepting patients with recurrent non-small cell lung cancer (see also: clinical trials at the Masonic Cancer Center) . For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
For more information from the National Cancer Institute about non-small cell lung cancer, see the following:
For general cancer information and other resources from the National Cancer Institute, see the following:
The PDQ cancer information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.
Changes were made to this summary to match those made to the health professional version.
Date last modified: 2009-07-02