General Information About Colon Cancer

Colon cancer is a disease in which malignant (cancer) cells form in the tissues of the colon.

The colon is part of the body's digestive system . The digestive system removes and processes nutrients (vitamins , minerals , carbohydrates , fats, proteins , and water) from foods and helps pass waste material out of the body. The digestive system is made up of the esophagus , stomach , and the small and large intestines . The first 6 feet of the large intestine are called the large bowel or colon. The last 6 inches are the rectum and the anal canal. The anal canal ends at the anus (the opening of the large intestine to the outside of the body).

Anatomy of the lower digestive system, showing the colon and other organs.

See the PDQ summary on Unusual Cancers of Childhood for information about colorectal cancer in children.

Age and health history can affect the risk of developing colon cancer.

Anything that increases your chance of getting 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 include the following:

• Age 50 or older.
• Afamily history of cancer of thecolon orrectum.
• A personal history of cancer of the colon, rectum,ovary ,endometrium , orbreast.
• A history ofpolyps(small pieces of bulging tissue) in the colon.
  
  Polyps in the colon. Some polyps have a stalk and others do not. Inset shows a photo of a polyp with a stalk.
• A history ofulcerative colitis (ulcers in the lining of the large intestine) orCrohn disease.
• Certainhereditary conditions, such asfamilial adenomatous polyposis andhereditary nonpolyposis colon cancer(HNPCC; Lynch Syndrome).

Possible signs of colon cancer include a change in bowel habits or blood in the stool.

These and other symptoms may be caused by colon cancer. Other conditions may cause the same symptoms. A doctor should be consulted if any of the following problems occur:

• A change in bowel habits.
• Blood (either bright red or very dark) in thestool.
• Diarrhea ,constipation, or feeling that the bowel does not empty completely.
• Stools that are narrower than usual.
• Frequent gas pains, bloating, fullness, or cramps.
• Weight loss for no known reason.
• Feeling very tired.
• Vomiting.

Tests that examine the colon and rectum are used to detect (find) and diagnose colon cancer.

The following tests and procedures may be used:

• Physical examand 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 and past illnesses and treatments will also be taken.
• Digital rectal exam: An exam of the rectum. The doctor or nurse inserts a lubricated, gloved finger into the rectum to feel for lumps or anything else that seems unusual.
• Fecal occult blood test: A test to check stool (solid waste) for blood that can only be seen with a microscope. Small samples of stool are placed on special cards and returned to the doctor or laboratory for testing.
  
  Fecal Occult Blood Test (FOBT) kit to check for blood in stool.
• Barium enema : A series ofx-rays of the lowergastrointestinal tract. A liquid that contains barium (a silver-white metallic compound) is put into the rectum. The barium coats the lower gastrointestinal tract and x-rays are taken. This procedure is also called a lower GI series.
  
  Barium enema procedure. The patient lies on an x-ray table. Barium liquid is put into the rectum and flows through the colon. X-rays are taken to look for abnormal areas.
• Sigmoidoscopy : A procedure to look inside the rectum andsigmoid (lower) colon for polyps (small pieces of bulging tissue),abnormal areas, or cancer. Asigmoidoscope is inserted through the rectum into the sigmoid colon. Asigmoidoscope is a thin, tube-like instrument with a light and a lens for viewing. It may also have a tool to remove polyps ortissuesamples, which are checked under a microscope for signs of cancer.
  
  Sigmoidoscopy. A thin, lighted tube is inserted through the anus and rectum and into the lower part of the colon to look for abnormal areas.
• Colonoscopy : A procedure to look inside the rectum and colon for polyps, abnormal areas, or cancer. Acolonoscopeis inserted through the rectum into the colon. A colonoscope is a thin, tube-like instrument with a light and a lens for viewing. It may also have a tool to remove polyps or tissue samples, which are checked under a microscope for signs of cancer.
  
  Colonoscopy. A thin, lighted tube is inserted through the anus and rectum and into the colon to look for abnormal areas.
• Biopsy : The removal ofcells or tissues so they can be viewed under a microscope by apathologistto check for signs of cancer.
• Virtual colonoscopy : A procedure that uses a series of x-rays calledcomputed tomographyto make a series of pictures of the colon. A computer puts the pictures together to create detailed images that may show polyps and anything else that seems unusual on the inside surface of the colon. This test is also called colonography or CT colonography.

Certain factors affect prognosis (chance of recovery) and treatment options.

The prognosis (chance of recovery) depends on the following:

• Thestageof the cancer (whether the cancer is in the inner lining of the colon only, involves the whole colon, or has spread to other places in the body).
• Whether the cancer has blocked or created a hole in the colon.
• Whether there are any cancer cells left after surgery.
• The blood levels ofcarcinoembryonic antigen(CEA; a substance in the blood that may be increased when cancer is present) before treatment begins.
• Whether the cancer hasrecurred.
• The patient's general health.

Treatment options depend on the following:

• The stage of the cancer.
• Whether the cancer has recurred.
• The patient's general health.

Stages of Colon Cancer

After colon cancer has been diagnosed, tests are done to find out if cancer cells have spread within the colon or to other parts of the body.

The process used to find out if cancer has spread within the colon 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. The following tests and procedures may be used in the staging process:

• CT scan (CAT scan): A procedure that makes a series of detailed pictures of areas inside the body, such as theabdomen ,pelvis , or chest, taken from different angles. The pictures are made by a computer linked to anx-ray machine. Adye may beinjected into avein or swallowed to help theorgans ortissuesshow up more clearly. This procedure is also called computed tomography, computerized tomography, or computerized axial tomography.
• Lymph node biopsy : The removal of all or part of a lymph node. Apathologist views the tissue under a microscope to look for cancercells.
• Complete blood count (CBC): A procedure in which a sample ofbloodis drawn and checked for the following:
  • The number ofred blood cells ,white blood cells , andplatelets.
  • The amount ofhemoglobin (theprotein that carriesoxygen) in the red blood cells.
  • The portion of the blood sample made up of red blood cells.
• Carcinoembryonic antigen (CEA) assay : A test that measures the level of CEA in the blood. CEA is released into the bloodstream from both cancer cells and normal cells. When found in higher than normal amounts, it can be a sign ofcolon canceror other conditions.
• MRI(magnetic resonance imaging): A procedure that uses a magnet, radio waves, and a computer to make a series of detailed pictures of areas inside the colon. A substance called gadolinium is injected into the patient through a vein. The gadolinium collects around the cancer cells so they show up brighter in the picture. This procedure is also called nuclear magnetic resonance imaging (NMRI).
• 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.
• Surgery : A procedure to remove thetumorand see how far it has spread through the colon.
• PET scan (positron emission tomography scan): A procedure to findmalignant tumor cells in the body. A small amount ofradioactive 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.

There are three ways that cancer spreads in the body.

The three ways that cancer spreads in the body are:

• Throughtissue . Cancerinvadesthe surrounding normal tissue.
• Through thelymph system . Cancer invades the lymph system and travels through thelymph vesselsto other places in the body.
• Through theblood . Cancer invades theveins andcapillariesand travels through the blood to other places in the body.

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 colon cancer:

Stage 0 (Carcinoma in Situ)

Stage 0 (colon carcinoma in situ). Abnormal cells are shown in the mucosa of the colon wall.

In stage 0 , abnormal cells are found in the mucosa (innermost layer) of the colon wall. These abnormal cells may become cancer and spread. Stage 0 is also called carcinoma in situ.

Stage I

Stage I colon cancer. Cancer has spread from the mucosa of the colon wall to the muscle layer.

In stage I , cancer has formed in the mucosa (innermost layer) of the colon wall and has spread to the submucosa (layer of tissue under the mucosa). Cancer may have spread to the muscle layer of the colon wall.

Stage II

Stage II colon cancer. In stage IIA, cancer has spread through the muscle layer of the colon wall to the serosa. In stage IIB, cancer has spread through the serosa but has not spread to nearby organs. In stage IIC, cancer has spread through the serosa to nearby organs.

Stage II colon cancer is divided into stage IIA, stage IIB, and stage IIC.

• Stage IIA:Cancer has spread through the muscle layer of thecolon wall to theserosa(outermost layer) of the colon wall.
• Stage IIB:Cancer has spread through theserosa (outermost layer) of thecolon wall but has not spread to nearbyorgans.
• Stage IIC:Cancer has spread through theserosa (outermost layer) of thecolon wall to nearbyorgans.

Stage III

Stage III colon cancer is divided into stage IIIA, stage IIIB, and stage IIIC.

Stage IIIA colon cancer. Cancer may have spread through the mucosa of the colon wall to the submucosa and muscle layer, and has spread to one to three nearby lymph nodes or tissues near the lymph nodes. OR, cancer has spread through the mucosa to the submucosa and four to six nearby lymph nodes.

In stage IIIA:

• Cancer may have spread through themucosa (innermost layer) of thecolon wall to thesubmucosa (layer oftissue under the mucosa) and may have spread to the muscle layer of the colon wall. Cancer has spread to at least one but not more than 3 nearbylymph nodes or cancercellshave formed in tissues near the lymph nodes; or
• Cancer has spread through the mucosa (innermost layer) of the colon wall to the submucosa (layer of tissue under the mucosa). Cancer has spread to at least 4 but not more than 6 nearby lymph nodes.

Stage IIIB colon cancer. Cancer has spread through the muscle layer of the colon wall to the serosa or has spread through the serosa but not to nearby organs; cancer has spread to one to three nearby lymph nodes or to tissues near the lymph nodes. OR, cancer has spread to the muscle layer or to the serosa, and to four to six nearby lymph nodes. OR, cancer has spread through the mucosa to the submucosa and may have spread to the muscle layer; cancer has spread to seven or more nearby lymph nodes.

In stage IIIB:

• Cancer has spread through the muscle layer of thecolon wall to theserosa (outermost layer) of the colon wall or has spread through the serosa but not to nearbyorgans . Cancer has spread to at least one but not more than 3 nearbylymph nodes or cancercells have formed intissuesnear the lymph nodes; or
• Cancer has spread to the muscle layer of the colon wall or to the serosa (outermost layer) of the colon wall. Cancer has spread to at least 4 but not more than 6 nearby lymph nodes; or
• Cancer has spread through themucosa (innermost layer) of the colon wall to thesubmucosa(layer of tissue under the mucosa) and may have spread to the muscle layer of the colon wall. Cancer has spread to 7 or more nearby lymph nodes.

Stage IIIC colon cancer. Cancer has spread through the serosa of the colon wall but not to nearby organs; cancer has spread to four to six nearby lymph nodes. OR, cancer has spread through the muscle layer to the serosa or has spread through the serosa but not to nearby organs; cancer has spread to seven or more nearby lymph nodes. OR, cancer has spread through the serosa to nearby organs and to one or more nearby lymph nodes or to tissues near the lymph nodes.

In stage IIIC:

• Cancer has spread through theserosa (outermost layer) of thecolon wall but has not spread to nearbyorgans . Cancer has spread to at least 4 but not more than 6 nearbylymph nodes; or
• Cancer has spread through the muscle layer of the colon wall to the serosa (outermost layer) of the colon wall or has spread through the serosa but has not spread to nearby organs. Cancer has spread to 7 or more nearby lymph nodes; or
• Cancer has spread through the serosa (outermost layer) of the colon wall and has spread to nearby organs. Cancer has spread to one or more nearby lymph nodes or cancer cells have formed intissuesnear the lymph nodes.

Stage IV

Stage IV colon cancer. The cancer has spread through the blood and lymph nodes to other parts of the body, such as the lung, liver, abdominal wall, or ovary.

Stage IV colon cancer is divided into stage IVA and stage IVB.

• Stage IVA:Cancer may have spread through thecolon wall and may have spread to nearbyorgans orlymph nodes . Cancer has spread to one organ that is not near the colon, such as theliver ,lung , orovary, or to a distant lymph node.
• Stage IVB:Cancer may have spread through thecolon wall and may have spread to nearbyorgans orlymph nodes . Cancer has spread to more than one organ that is not near the colon or into the lining of theabdominalwall.

Recurrent Colon Cancer

Recurrent colon cancer is cancer that has recurred (come back) after it has been treated. The cancer may come back in the colon or in other parts of the body, such as the liver , lungs, or both.

Treatment Option Overview

There are different types of treatment for patients with colon cancer.

Different types of treatment are available for patients with colon 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.

Four types of standard treatment are used:

Surgery

Surgery (removing the cancer in an operation) is the most common treatment for all stages of colon cancer. A doctor may remove the cancer using one of the following types of surgery:

• Local excision : If the cancer is found at a very early stage, the doctor may remove it without cutting through theabdominal wall. Instead, the doctor may put a tube through therectum into thecolon and cut the cancer out. This is called a local excision. If the cancer is found in apolyp (a small bulging piece oftissue ), the operation is called apolypectomy.
• Resection : If the cancer is larger, the doctor will perform a partialcolectomy (removing the cancer and a small amount of healthy tissue around it). The doctor may then perform ananastomosis (sewing the healthy parts of the colon together). The doctor will also usually removelymph nodesnear the colon and examine them under a microscope to see whether they contain cancer.
  
  Colon cancer surgery with anastomosis. Part of the colon containing the cancer and nearby healthy tissue is removed, and then the cut ends of the colon are joined.
• Resection andcolostomy : If the doctor is not able to sew the 2 ends of the colon back together, astoma(an opening) is made on the outside of the body for waste to pass through. This procedure is called a colostomy. A bag is placed around the stoma to collect the waste. Sometimes the colostomy is needed only until the lower colon has healed, and then it can be reversed. If the doctor needs to remove the entire lower colon, however, the colostomy may be permanent.
  
  Colon cancer surgery with colostomy. Part of the colon containing the cancer and nearby healthy tissue is removed, a stoma is created, and a colostomy bag is attached to the stoma.
• Radiofrequency ablation : The use of a special probe with tiny electrodes that kill cancer cells. Sometimes the probe is inserted directly through the skin and onlylocal anesthesia is needed. In other cases, the probe is inserted through anincision in theabdomen . This is done in the hospital withgeneral anesthesia.
• Cryosurgery : A treatment that uses an instrument to freeze and destroyabnormal tissue, such ascarcinoma in situ . This type of treatment is also calledcryotherapy.

Even if the doctor removes all the cancer that can be seen at the time of the operation, 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 lower the risk that the cancer will come back, is called adjuvant therapy.

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 cerebrospinal fluid , an organ , or a body cavity such as the abdomen , the drugs mainly affect cancer cells in those areas (regional chemotherapy).

Chemoembolization of the hepatic artery may be used to treat cancer that has spread to the liver . This involves blocking the hepatic artery (the main artery that supplies blood to the liver) and injecting anticancer drugs between the blockage and the liver. The liver's arteries then deliver the drugs throughout the liver. Only a small amount of the drug reaches other parts of the body. The blockage may be temporary or permanent, depending on what is used to block the artery. The liver continues to receive some blood from the hepatic portal vein , which carries blood from the stomach and intestine.

The way the chemotherapy is given depends on the type and stage of the cancer being treated.

See Drugs Approved for Colon Cancer for more information.

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. The way the radiation therapy is given depends on the type and stage of the cancer being treated.

Targeted therapy

Targeted therapy is a type of treatment that uses drugs or other substances to identify and attack specific cancer cells without harming normal cells. Monoclonal antibody therapy is a type of targeted therapy used in the treatment of colon cancer.

Monoclonal antibody therapy uses antibodies made in the laboratory from a single type of immune system cell. These antibodies can identify substances on cancer cells or normal substances that may help cancer cells grow. The antibodies attach to the substances and kill the cancer cells, block their growth, or keep them from spreading. Monoclonal antibodies are given by infusion . They may be used alone or to carry drugs, toxins , or radioactive material directly to cancer cells.

See Drugs Approved for Colon Cancer for more information.

New types of treatment are being tested in clinical trials.

Information about clinical trials is available from the NCI Web site.

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 listing of clinical trials.

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.

For colon cancer , a blood test to measure carcinoembryonic antigen (CEA; a substance in the blood that may be increased when colon cancer is present) may be done along with other tests to see if the cancer has come back.

Treatment Options for Colon Cancer

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.

Stage 0 (Carcinoma in Situ)

Treatment of stage 0 (carcinoma in situ ) may include the following types of surgery:

• Local excision or simplepolypectomy.
• Resection andanastomosis . This is done when thetumoris too large to remove by local excision.

Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with stage 0 colon cancer. 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.

Stage I Colon Cancer

Treatment of stage I colon cancer is usually resection and anastomosis.

Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with stage I colon cancer. 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.

Stage II Colon Cancer

Treatment of stage II colon cancer may include the following:

• Resection andanastomosis.
• Clinical trials ofchemotherapy orbiologic therapy aftersurgery.

Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with stage II colon cancer. 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.

Stage III Colon Cancer

Treatment of stage III colon cancer may include the following:

• Resection andanastomosis followed bychemotherapy.
• Clinical trials of chemotherapy aftersurgery.

Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with stage III colon cancer. 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.

Stage IV and Recurrent Colon Cancer

Treatment of stage IV and recurrent colon cancer may include the following:

• Resection with or withoutanastomosis.
• Surgery to remove parts of otherorgans , such as theliver ,lungs , andovaries , where the cancer may haverecurredor spread.
• Radiation therapy orchemotherapy may be offered to some patients aspalliative therapy to relievesymptoms and improvequality of life.
• Chemotherapy andtargeted therapy with amonoclonal antibody.
• Clinical trialsof chemotherapy and/or targeted therapy with a monoclonal antibody.

Treatment of locally recurrent colon cancer may be local excision.

Special treatments of cancer that has spread to or recurred in the liver may include the following:

• Chemotherapy followed byresection.
• Radiofrequency ablation orcryosurgery.
• Clinical trials ofhepatic chemoembolizationwith radiation therapy.

Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with stage IV colon cancer and recurrent colon cancer. 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.

To Learn More About Colon Cancer

For more information from the National Cancer Institute about colon cancer, see the following:

• Colon and Rectal Cancer Home Page
• What You Need to Know About™ Cancer of the Colon and Rectum
• Colorectal Cancer Prevention
• Colorectal Cancer Screening
• Colorectal Cancer Screening(NCI Fact Sheet)
• Unusual Cancers of Childhood
• Cryosurgery in Cancer Treatment: Questions and Answers
• Drugs Approved for Colon Cancer
• Targeted Cancer Therapies
• Understanding Cancer Series: Targeted Therapies (Advances in Targeted Therapies)
• Understanding Cancer Series: Gene Testing

For general cancer information and other resources from the National Cancer Institute, see the following:

• What You Need to Know About™ Cancer
• Understanding Cancer Series: Cancer
• Cancer Staging
• Chemotherapy and You: Support for People With Cancer
• Radiation Therapy and You: Support for People With Cancer
• Coping with Cancer: Supportive and Palliative Care
• Questions to Ask Your Doctor About Cancer
• Cancer Library
• Information For Survivors/Caregivers/Advocates

Changes to This Summary (11 / 10 / 2011)

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.

Editorial changes were made to this summary.

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PDQ is a comprehensive cancer database available on NCI's Web site.

PDQ is the National Cancer Institute's (NCI's) comprehensive cancer information database. Most of the information contained in PDQ is available online at NCI's Web site. PDQ is provided as a service of the NCI. The NCI is part of the National Institutes of Health, the federal government's focal point for biomedical research.

PDQ contains cancer information summaries.

The PDQ database contains summaries of the latest published information on cancer prevention, detection, genetics, treatment, supportive care, and complementary and alternative medicine. Most summaries are available in two versions. The health professional versions provide detailed information written in technical language. The patient versions are written in easy-to-understand, nontechnical language. Both versions provide current and accurate cancer information.

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Editorial Boards made up of experts in oncology and related specialties are responsible for writing and maintaining the cancer information summaries. The summaries are reviewed regularly and changes are made as new information becomes available. The date on each summary ("Date Last Modified") indicates the time of the most recent change.

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A clinical trial is a study to answer a scientific question, such as whether one treatment is better than another. Trials are based on past studies and what has been learned in the laboratory. Each trial answers certain scientific questions in order to find new and better ways to help cancer patients. During treatment clinical trials, information is collected about the effects of a new treatment and how well it works. If a clinical trial shows that a new treatment is better than one currently being used, the new treatment may become "standard." 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.

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Last Revised: 2011-11-10

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