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Non-Small Cell Lung Cancer

Definition

Non-Small Cell Lung Cancer Non-small cell lung cancer is a disease in which malignant (cancer) cells form in the tissues of the lung.

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:

  • Squamous cell carcinoma:
    Cancer that begins in squamous cells, which are thin, flat cells that look like fish scales. This is also called epidermoid carcinoma.
  • Large cell carcinoma:
    Cancer that may begin in several types of large cells.
  • Adenocarcinoma:
    Cancer that begins in the cells that line the alveoli and make substances such as mucus.
  • Bronchiolo-alveolar carcinoma:
    A subtype of adenocarcinoma that is less agreesive.

Risk Factors

Smoking can increase the risk of developing non-small cell lung cancer. Anything that increases a person's chance of developing a disease is called a risk factor. Smoking cigarettes or cigars is the most common cause of lung cancer. The more years a person smokes, the greater the risk. If a person has stopped smoking, the risk becomes lower as the years pass, but is never completely gone.

Risk factors for lung cancer include the following:

  • Smoking cigarettes or cigars, now or in the past.
  • Being exposed to second-hand smoke.
  • Being treated with radiation therapy to the breast or chest.
  • Being exposed to asbestos, radon, chromium, arsenic, soot, or tar.

When smoking is combined with other risk factors, the risk of developing lung cancer is increased.

Symptoms

Sometimes lung cancer does not cause any symptoms and is found during a routine chest x-ray. Possible signs of non-small cell lung cancer include a cough that doesn't go away and shortness of breath.

Symptoms may be caused by lung cancer or by other conditions. A doctor should be consulted if any of the following problems occur:

  • A cough that doesn’t go away.
  • Trouble breathing.
  • Chest discomfort.
  • Wheezing.
  • Streaks of blood in sputum (mucus coughed up from the lungs).
  • Hoarseness.
  • Loss of appetite.
  • Weight loss for no known reason.
  • Feeling very tired.

Diagnosis

Treatment and diagnosis for patients with non-small cell lung cancer occurs in the U-M Cancer Center's Multidisciplinary Lung Cancer Clinic.

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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:

Physical exam and history:
An exam of the body to check general signs of health, including checking for signs of disease, such as lumps or anything else that seems unusual.

A history of the patient’s health habits
including smoking, and past jobs, illnesses, and treatments will also be taken.

Chest x-ray:
An x-ray of the organs and bones inside the chest. An x-ray is a type of energy beam that can go through the body and onto film, making a picture of areas inside the body.

CT scan (CAT scan):
A procedure that makes a series of detailed pictures of areas inside the body, such as the chest, taken from different angles. The pictures are made by a computer linked to an x-ray machine. A dye may be injected into a vein or swallowed to help the organs or tissues show up more clearly. This procedure is also called computed tomography, computerized tomography, or computerized axial tomography.

PET scan (positron emission tomography scan):
A procedure to find malignant tumor cells in the body. A small amount of radioactive glucose (sugar) is injected into a vein. The PET scanner rotates around the body and makes a picture of where glucose is being used in the body. Malignant tumor cells show up brighter in the picture because they are more active and take up more glucose than normal cells do.

Sputum cytology:
A procedure in which a pathologist views a sample of sputum (mucus coughed up from the lungs) under a microscope, to check for cancer cells.

Fine-needle aspiration biopsy of the lung:
The removal of part of a lump or suspicious tissue using a thin needle. This procedure is also called needle biopsy. Ultrasound or another imaging procedure is used to locate the abnormal tissue in the lung. A small incision may be made in the skin where the biopsy needle is inserted into the abnormal tissue. A sample is removed with the needle and sent to the laboratory. A pathologist then views the sample under a microscope to look for cancer cells.

Bronchoscopy:
A procedure to look inside the trachea (windpipe) and large airways in the lung for abnormal areas. A bronchoscope (a thin, lighted tube) is inserted through the nose or mouth into the trachea and lungs. Tissue samples may be taken for biopsy.

Thoracoscopy:
A surgical procedure to look at the organs inside the chest to check for abnormal areas. An incision (cut) is made between two ribs, and a thoracoscope (a thin, lighted tube) is inserted into the chest. Tissue samples and lymph nodes may be removed for biopsy. This procedure may be used to remove parts of the lung. If certain tissues, organs, or lymph nodes can’t be reached, a thoracotomy may be done. In this procedure, a larger incision is made between the ribs and the chest is opened.

Thoracentesis:
The removal of fluid from the space between the lining of the chest and the lung, using a needle. A pathologist views the fluid under a microscope to look for cancer cells.

Treatment

Treatment of non-small cell lung cancer depends on the stage of disease and the general health of the person with the disease.

For patients with disease localized to one mass within a lung, treatment usually involves surgery to remove the cancer. Surgery can involve the removal of part of the lung or the whole lung. For patients who cannot undergo such surgery, radiotherapy, stereotactic radiosurgery or radiofrequency ablation may be offered to eradicate the disease.

For patients with disease that involves the lung and lymphnodes within the chest, treatment usually consists of chemotherapy and radiation therapy used together. The goal of this treatment is to cure the cancer, though most patients do have recurrence of the disease.

For patients with spread of cancer to the other lung, pleurae cavity or another site in the body, treatment usually consists of newer, molecularly targeted drugs that can control the disease for some time. However, this stage of disease is not curable currently with available therapy.

Prognosis / Recovery

Certain factors affect prognosis (chance of recovery) and treatment options. The prognosis and treatment options depend on the following:
  • The stage of the cancer (the size of the tumor and whether it is in the lung only or has spread to other places in the body).
  • The type of lung cancer.
  • Whether there are symptoms such as coughing or trouble breathing.
  • The patient’s general health.

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 lung cancer clinical trials at the U-M Cancer Center is avialable on the engage website. Information on trials nation-wide is available from the NCI Web site.

For more information

Visit the National Cancer Institute's web page on non-small cell lung cancer treatment.

If you have questions, please contact Cancer AnswerLine at 800-865-1125.

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updated 9/2007


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University of Michigan Comprehensive Cancer Center
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This site is part of the U-M Health System. The information presented is not a tool for self diagnosis or a substitute for professional care. © 2008 U-M Comprehensive Cancer Center