The Colon and Rectum

Understanding Cancer

Risk Factors

Screening

Symptoms

Diagnosis

Staging

Treatment

Getting a Second Opinion Treatment Methods Surgery Chemotherapy Biological Therapy Radiation Therapy Treatment for Colon Cancer Treatment for Rectal Cancer

Nutrition and Physical Activity

Rehabilitation

Follow-up Care

Complementary Medicine

Sources of Support

The Promise of Cancer Research

Research on Prevention Research on Screening and Diagnosis Research on Treatment

National Cancer Institute Information Resources

National Cancer Institute Publications

About This Booklet

This National Cancer Institute (NCI) booklet (NIH Publication No. 06-1552) is about cancer of the colon and rectum. Cancer that begins in the colon is called colon cancer, and cancer that begins in the rectum is called rectal cancer. Cancer that starts in either of these organs may also be called colorectal cancer.

In the United States, colorectal cancer is the fourth most common cancer in men, after skin, prostate, and lung cancer. It is also the fourth most common cancer in women, after skin, breast, and lung cancer.

You will read about possible risk factors, screening, symptoms, diagnosis, and treatment. You will also find lists of questions to ask your doctor. It may help to take this booklet with you to your next appointment.

Important terms appear in italics. By clicking on the term, you can get its definition. Most words have a "sounds-like" spelling to show how to pronounce them. Definitions of more than 4,000 terms are also on the NCI Web site in the NCI Dictionary of Cancer Terms. You can access it at http://www.cancer.gov/dictionary.

If you want more information about colorectal cancer, please visit our Web site at http://www.cancer.gov/cancertopics/types/colon-and-rectal. Or contact our Cancer Information Service. We can answer your questions about cancer. We can send you NCI booklets, fact sheets, and other materials. You can call 1-800-4-CANCER (1-800-422-6237) or instant message us through the LiveHelp ¹ service at http://www.cancer.gov/help.

The colon and rectum are parts of the digestive system. They form a long, muscular tube called the large intestine (also called the large bowel). The colon is the first 4 to 5 feet of the large intestine, and the rectum is the last several inches.

Partly digested food enters the colon from the small intestine. The colon removes water and nutrients from the food and turns the rest into waste (stool). The waste passes from the colon into the rectum and then out of the body through the anus.

This picture shows the colon and rectum.

Cancer begins in cells, the building blocks that make up tissues. Tissues make up the organs of the body.

Normally, cells grow and divide to form new cells as the body needs them. When cells grow old, they die, and new cells take their place.

Sometimes, this orderly process goes wrong. New cells form when the body does not need them, and old cells do not die when they should. These extra cells can form a mass of tissue called a growth or tumor.

Tumors can be benign or malignant:

• Benign tumors are not cancer:
  • Benign tumors are rarely life-threatening.
  • Most benign tumors can be removed. They usually do not grow back.
  • Benign tumors do not invade the tissues around them.
  • Cells from benign tumors do not spread to other parts of the body.

• Malignant tumors are cancer:
  • Malignant tumors are generally more serious than benign tumors. They may be life- threatening.
  • Malignant tumors often can be removed. But sometimes they grow back.
  • Malignant tumors can invade and damage nearby tissues and organs.
  • Cancer cells can break away from a malignant tumor and spread to other parts of the body. Cancer cells spread by entering the bloodstream or the lymphatic system. The cancer cells form new tumors that damage other organs. The spread of cancer is called metastasis.

When colorectal cancer spreads outside the colon or rectum, cancer cells are often found in nearby lymph nodes. If cancer cells have reached these nodes, they may also have spread to other lymph nodes or other organs. Colorectal cancer cells most often spread to the liver.

When 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 original tumor. For example, if colorectal cancer spreads to the liver, the cancer cells in the liver are actually colorectal cancer cells. The disease is metastatic colorectal cancer, not liver cancer. For that reason, it is treated as colorectal cancer, not liver cancer. Doctors call the new tumor "distant" or metastatic disease.

No one knows the exact causes of colorectal cancer. Doctors often cannot explain why one person develops this disease and another does not. However, it is clear that colorectal cancer is not contagious. No one can catch this disease from another person.

Research has shown that people with certain risk factors are more likely than others to develop colorectal cancer. A risk factor is something that may increase the chance of developing a disease.

Studies have found the following risk factors for colorectal cancer:

• Age over 50: Colorectal cancer is more likely to occur as people get older. More than 90 percent of people with this disease are diagnosed after age 50. The average age at diagnosis is 72.
• Colorectal polyps: Polyps are growths on the inner wall of the colon or rectum. They are common in people over age 50. Most polyps are benign (not cancer), but some polyps (adenomas) can become cancer. Finding and removing polyps may reduce the risk of colorectal cancer.
• Family history of colorectal cancer: Close relatives (parents, brothers, sisters, or children) of a person with a history of colorectal cancer are somewhat more likely to develop this disease themselves, especially if the relative had the cancer at a young age. If many close relatives have a history of colorectal cancer, the risk is even greater.
• Genetic alterations: Changes in certain genes increase the risk of colorectal cancer.

Hereditary nonpolyposis colon cancer (HNPCC) is the most common type of inherited (genetic) colorectal cancer. It accounts for about 2 percent of all colorectal cancer cases. It is caused by changes in an HNPCC gene. Most people with an altered HNPCC gene develop colon cancer, and the average age at diagnosis of colon cancer is 44.

Familial adenomatous polyposis (FAP) is a rare, inherited condition in which hundreds of polyps form in the colon and rectum. It is caused by a change in a specific gene called APC. Unless FAP is treated, it usually leads to colorectal cancer by age 40. FAP accounts for less than 1 percent of all colorectal cancer cases.

Family members of people who have HNPCC or FAP can have genetic testing to check for specific genetic changes. For those who have changes in their genes, health care providers may suggest ways to try to reduce the risk of colorectal cancer, or to improve the detection of this disease. For adults with FAP, the doctor may recommend an operation to remove all or part of the colon and rectum.

• Personal history of cancer: A person who has already had colorectal cancer may develop colorectal cancer a second time. Also, women with a history of cancer of the ovary, uterus (endometrium), or breast are at a somewhat higher risk of developing colorectal cancer.
• Ulcerative colitis or Crohn's disease: A person who has had a condition that causes inflammation of the colon (such as ulcerative colitis or Crohn's disease) for many years is at increased risk of developing colorectal cancer.
• Diet: Studies suggest that diets high in fat (especially animal fat) and low in calcium, folate, and fiber may increase the risk of colorectal cancer. Also, some studies suggest that people who eat a diet very low in fruits and vegetables may have a higher risk of colorectal cancer. However, results from diet studies do not always agree, and more research is needed to better understand how diet affects the risk of colorectal cancer.
• Cigarette smoking: A person who smokes cigarettes may be at increased risk of developing polyps and colorectal cancer.

Because people who have colorectal cancer may develop colorectal cancer a second time, it is important to have checkups. If you have colorectal cancer, you also may be concerned that your family members may develop the disease. People who think they may be at risk should talk to their doctor. The doctor may be able to suggest ways to reduce the risk and can plan an appropriate schedule for checkups. See the "Screening ²" section to learn more about tests that can find polyps or colorectal cancer.

Screening tests help your doctor find polyps or cancer before you have symptoms. Finding and removing polyps may prevent colorectal cancer. Also, treatment for colorectal cancer is more likely to be effective when the disease is found early.

To find polyps or early colorectal cancer:

• People in their 50s and older should be screened.

• People who are at higher-than-average risk of colorectal cancer should talk with their doctor about whether to have screening tests before age 50, what tests to have, the benefits and risks of each test, and how often to schedule appointments.

The following screening tests can be used to detect polyps, cancer, or other abnormal areas.
Your doctor can explain more about each test:

• Fecal occult blood test (FOBT): Sometimes cancers or polyps bleed, and the FOBT can detect tiny amounts of blood in the stool. If this test detects blood, other tests are needed to find the source of the blood. Benign conditions (such as hemorrhoids) also can cause blood in the stool.
• Sigmoidoscopy: Your doctor checks inside your rectum and the lower part of the colon with a lighted tube called a sigmoidoscope. If polyps are found, the doctor removes them. The procedure to remove polyps is called a polypectomy.
• Colonoscopy: Your doctor examines inside the rectum and entire colon using a long, lighted tube called a colonoscope. Your doctor removes polyps that may be found.
• Double-contrast barium enema: You are given an enema with a barium solution, and air is pumped into your rectum. Several x-ray pictures are taken of your colon and rectum. The barium and air help your colon and rectum show up on the pictures. Polyps or tumors may show up.
• Digital rectal exam: A rectal exam is often part of a routine physical examination. Your doctor inserts a lubricated, gloved finger into your rectum to feel for abnormal areas.
• Virtual colonoscopy: This method is under study. See "The Promise of Cancer Research ³."

You may find it helpful to read the NCI fact sheet "Colorectal Cancer Screening: Questions and Answers." ⁴

A common symptom of colorectal cancer is a change in bowel habits. Symptoms include:

• Having diarrhea or constipation

• Feeling that your bowel does not empty completely

• Finding blood (either bright red or very dark) in your stool

• Finding your stools are narrower than usual

• Frequently having gas pains or cramps, or feeling full or bloated

• Losing weight with no known reason

• Feeling very tired all the time

• Having nausea or vomiting

Most often, these symptoms are not due to cancer. Other health problems can cause the same symptoms. Anyone with these symptoms should see a doctor to be diagnosed and treated as early as possible.

Usually, early cancer does not cause pain. It is important not to wait to feel pain before seeing a doctor.

If you have screening test results that suggest cancer or you have symptoms, your doctor must find out whether they are due to cancer or some other cause. Your doctor asks about your personal and family medical history and gives you a physical exam. You may have one or more of the tests described in the "Screening" ² section.

If your physical exam and test results do not suggest cancer, your doctor may decide that no further tests are needed and no treatment is necessary. However, your doctor may recommend a schedule for checkups.

If tests show an abnormal area (such as a polyp), a biopsy to check for cancer cells may be necessary. Often, the abnormal tissue can be removed during colonoscopy or sigmoidoscopy. A pathologist checks the tissue for cancer cells using a microscope.

If the biopsy shows that cancer is present, your doctor needs to know the extent (stage) of the disease to plan the best treatment. The stage is based on whether the tumor has invaded nearby tissues, whether the cancer has spread and, if so, to what parts of the body.

Your doctor may order some of the following tests:

• Blood tests: Your doctor checks for carcinoembryonic antigen (CEA) and other substances in the blood. Some people who have colorectal cancer or other conditions have a high CEA level.

• Colonoscopy: If colonoscopy was not performed for diagnosis, your doctor checks for abnormal areas along the entire length of the colon and rectum with a colonoscope.

• Endorectal ultrasound: An ultrasound probe is inserted into your rectum. The probe sends out sound waves that people cannot hear. The waves bounce off your rectum and nearby tissues, and a computer uses the echoes to create a picture. The picture may show how deep a rectal tumor has grown or whether the cancer has spread to lymph nodes or other nearby tissues.

• Chest x-ray: X-rays of your chest may show whether cancer has spread to your lungs.

• CT scan: An x-ray machine linked to a computer takes a series of detailed pictures of areas inside your body. You may receive an injection of dye. A CT scan may show whether cancer has spread to the liver, lungs, or other organs.

Your doctor may also use other tests (such as MRI) to see whether the cancer has spread. Sometimes staging is not complete until after surgery to remove the tumor. (Surgery for colorectal cancer is described in the "Treatment" ⁵ section.)

Doctors describe colorectal cancer by the following stages:

Many people with colorectal cancer want to take an active part in making decisions about their medical care. It is natural to want to learn all you can about your disease and treatment choices. However, shock and stress after the diagnosis can make it hard to think of everything you want to ask your doctor. It often helps to make a list of questions before an appointment.

To help remember what your doctor says, you may take notes or ask whether you may use a tape recorder. You may also want to have a family member or friend with you when you talk to your doctor -- to take part in the discussion, to take notes, or just to listen.

You do not need to ask all your questions at once. You will have other chances to ask your doctor or nurse to explain things that are not clear and to ask for more details.

Your doctor may refer you to a specialist who has experience treating colorectal cancer, or you may ask for a referral. Specialists who treat colorectal cancer include gastroenterologists (doctors who specialize in diseases of the digestive system), surgeons, medical oncologists, and radiation oncologists. You may have a team of doctors.

Getting a Second Opinion

Before starting treatment, you might want a second opinion about your diagnosis and treatment plan. Many insurance companies cover a second opinion if you or your doctor requests it.

It may take some time and effort to gather medical records and arrange to see another doctor. Usually it is not a problem to take several weeks to get a second opinion. In most cases, the delay in starting treatment will not make treatment less effective. To make sure, you should discuss this delay with your doctor. Sometimes people with colorectal cancer need treatment right away.

There are a number of ways to find a doctor for a second opinion:

Your doctor may refer you to one or more specialists. NCI's Cancer Information Service, at 1-800-4-CANCER, can tell you about nearby treatment centers. Information Specialists also can assist you online through LiveHelp 1. A local or state medical society, a nearby hospital, or a medical school can usually provide the names of specialists. The American Board of Medical Specialties (ABMS) has a list of doctors who have had training and passed exams in their specialty. You can find this list in the Official ABMS Directory of Board Certified Medical Specialists. The Directory is in most public libraries. Also, ABMS offers this information at http://www.abms.org. (Click on "Who's Certified.") NCI provides a helpful fact sheet called "How To Find a Doctor or Treatment Facility If You Have Cancer." 6

Treatment Methods

The choice of treatment depends mainly on the location of the tumor in the colon or rectum and the stage of the disease. Treatment for colorectal cancer may involve surgery, chemotherapy, biological therapy or radiation therapy. Some people have a combination of treatments. These treatments are described below.

Colon cancer sometimes is treated differently from rectal cancer. Treatments for colon and rectal cancer are described separately below.

Your doctor can describe your treatment choices and the expected results. You and your doctor can work together to develop a treatment plan that meets your needs.

Cancer treatment is either local therapy or systemic therapy:

• Local therapy: Surgery and radiation therapy are local therapies. They remove or destroy cancer in or near the colon or rectum. When colorectal cancer has spread to other parts of the body, local therapy may be used to control the disease in those specific areas.

• Systemic therapy: Chemotherapy and biological therapy are systemic therapies. The drugs enter the bloodstream and destroy or control cancer throughout the body.

Because cancer treatments often damage healthy cells and tissues, side effects are common. Side effects depend mainly on the type and extent of the treatment. Side effects may not be the same for each person, and they may change from one treatment session to the next. Before treatment starts, your health care team will explain possible side effects and suggest ways to help you manage them.

At any stage of disease, supportive care is available to relieve the side effects of treatment, to control pain and other symptoms, and to ease emotional concerns. Information about such care is available on NCI's Web site at www.cancer.gov/cancertopics/coping, and from Information Specialists at 1-800-4-CANCER or LiveHelp ¹(http://www.cancer.gov/help).

You may want to talk to your doctor about taking part in a clinical trial, a research study of new treatment methods. "The Promise of Cancer Research ³" has more information about clinical trials.

Surgery

Surgery is the most common treatment for colorectal cancer.

• Colonoscopy: A small malignant polyp may be removed from your colon or upper rectum with a colonoscope. Some small tumors in the lower rectum can be removed through your anus without a colonoscope.
• Laparoscopy: Early colon cancer may be removed with the aid of a thin, lighted tube (laparoscope). Three or four tiny cuts are made into your abdomen. The surgeon sees inside your abdomen with the laparoscope. The tumor and part of the healthy colon are removed. Nearby lymph nodes also may be removed. The surgeon checks the rest of your intestine and your liver to see if the cancer has spread.
• Open surgery: The surgeon makes a large cut into your abdomen to remove the tumor and part of the healthy colon or rectum. Some nearby lymph nodes are also removed. The surgeon checks the rest of your intestine and your liver to see if the cancer has spread.

When a section of your colon or rectum is removed, the surgeon can usually reconnect the healthy parts. However, sometimes reconnection is not possible. In this case, the surgeon creates a new path for waste to leave your body. The surgeon makes an opening (stoma) in the wall of the abdomen, connects the upper end of the intestine to the stoma, and closes the other end. The operation to create the stoma is called a colostomy. A flat bag fits over the stoma to collect waste, and a special adhesive holds it in place.

For most people, the stoma is temporary. It is needed only until the colon or rectum heals from surgery. After healing takes place, the surgeon reconnects the parts of the intestine and closes the stoma. Some people, especially those with a tumor in the lower rectum, need a permanent stoma.

People who have a colostomy may have irritation of the skin around the stoma. Your doctor, your nurse, or an enterostomal therapist can teach you how to clean the area and prevent irritation and infection. The "Rehabilitation ⁷" section has more information about how people learn to care for a stoma.

The time it takes to heal after surgery is different for each person. You may be uncomfortable for the first few days. Medicine can help control your pain. 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.

It is common to feel tired or weak for a while. Also, surgery sometimes causes constipation or diarrhea. Your health care team monitors you for signs of bleeding, infection, or other problems requiring immediate treatment.

Chemotherapy

Chemotherapy uses anticancer drugs to kill cancer cells. The drugs enter the bloodstream and can affect cancer cells all over the body.

Anticancer drugs are usually given through a vein, but some may be given by mouth. You may be treated in an outpatient part of the hospital, at the doctor's office, or at home. Rarely, a hospital stay may be needed.

The side effects of chemotherapy depend mainly on the specific drugs and the dose. The drugs can harm normal cells that divide rapidly:

• Blood cells: These cells fight infection, help blood to clot, and carry oxygen to all parts of your body. When drugs affect your blood cells, you are more likely to get infections, bruise or bleed easily, and feel very weak and tired.
• Cells in hair roots: Chemotherapy can cause hair loss. Your hair will grow back, but it may be somewhat different in color and texture.
• Cells that line the digestive tract: Chemotherapy can cause poor appetite, nausea and vomiting, diarrhea, or mouth and lip sores.

Chemotherapy for colorectal cancer can cause the skin on the palms of the hands and bottoms of the feet to become red and painful. The skin may peel off.

Your health care team can suggest ways to control many of these side effects. Most side effects usually go away after treatment ends.

Biological Therapy

Some people with colorectal cancer that has spread receive a monoclonal antibody, a type of biological therapy. The monoclonal antibodies bind to colorectal cancer cells. They interfere with cancer cell growth and the spread of cancer. People receive monoclonal antibodies through a vein at the doctor's office, hospital, or clinic. Some people receive chemotherapy at the same time.

During treatment, your health care team will watch for signs of problems. Some people get medicine to prevent a possible allergic reaction. The side effects depend mainly on the monoclonal antibody used. Side effects may include rash, fever, abdominal pain, vomiting, diarrhea, blood pressure changes, bleeding, or breathing problems. Side effects usually become milder after the first treatment.

You may find it helpful to read NCI's booklet Biological Therapy: Treatments That Use Your Immune System to Fight Cancer ⁹.

Radiation Therapy

Radiation therapy (also called radiotherapy) uses high-energy rays to kill cancer cells. It affects cancer cells only in the treated area.

Doctors use different types of radiation therapy to treat cancer. Sometimes people receive two types:

Side effects depend mainly on the amount of radiation given and the part of your body that is treated. Radiation therapy to your abdomen and pelvis may cause nausea, vomiting, diarrhea, bloody stools, or urgent bowel movements. It also may cause urinary problems, such as being unable to stop the flow of urine from the bladder. In addition, your skin in the treated area may become red, dry, and tender. The skin near the anus is especially sensitive.

You are likely to become very tired during radiation therapy, especially in the later weeks of treatment. Resting is important, but doctors usually advise patients to try to stay as active as they can.

Although the side effects of radiation therapy can be distressing, your doctor can usually treat or control them. Also, side effects usually go away after treatment ends.

You may find it helpful to read NCI's booklet Radiation Therapy and You: A Guide to Self-Help During Cancer Treatment. ¹⁰

Treatment for Colon Cancer

Most patients with colon cancer are treated with surgery. Some people have both surgery and chemotherapy. Some with advanced disease get biological therapy.

A colostomy is seldom needed for people with colon cancer.

Although radiation therapy is rarely used to treat colon cancer, sometimes it is used to relieve pain and other symptoms.

Treatment for Rectal Cancer

For all stages of rectal cancer, surgery is the most common treatment. Some patients receive surgery, radiation therapy, and chemotherapy. Some with advanced disease get biological therapy.

About 1 out of 8 people with rectal cancer needs a permanent colostomy.

Radiation therapy may be used before and after surgery. Some people have radiation therapy before surgery to shrink the tumor, and some have it after surgery to kill cancer cells that may remain in the area. At some hospitals, patients may have radiation therapy during surgery. People also may have radiation therapy to relieve pain and other problems caused by the cancer.

It is important to eat well and stay as active as you can.

You need the right amount of calories to maintain a good weight during and after cancer treatment. You also need enough protein, vitamins, and minerals. Eating well may help you feel better and have more energy.

Eating well can be hard. Sometimes, especially during or soon after treatment, you may not feel like eating. You may be uncomfortable or tired. You may find that foods do not taste as good as they used to. You also may have nausea, vomiting, diarrhea, or mouth sores.

Your doctor, dietitian, or other health care provider can suggest ways to deal with these problems. The NCI booklet Eating Hints for Cancer Patients ¹¹ has many useful ideas and recipes.

Many people find they feel better when they stay active. Walking, yoga, swimming, and other activities can keep you strong and increase your energy. Whatever physical activity you choose, be sure to talk to your doctor before you start. Also, if your activity causes you pain or other problems, be sure to let your doctor or nurse know about it.

Rehabilitation is an important part of cancer care. Your health care team makes every effort to help you return to normal activities as soon as possible.

If you have a stoma, you need to learn to care for it. Doctors, nurses, and enterostomal therapists can help. Often, enterostomal therapists visit you before surgery to discuss what to expect. They teach you how to care for the stoma after surgery. They talk about lifestyle issues, including emotional, physical, and sexual concerns. Often they can provide information about resources and support groups.

Follow-up care after treatment for colorectal cancer is important. Even when the cancer seems to have been completely removed or destroyed, the disease sometimes returns because undetected cancer cells remained somewhere in the body after treatment. Your doctor monitors your recovery and checks for recurrence of the cancer. Checkups help ensure that any changes in health are noted and treated if needed.

Checkups may include a physical exam (including a digital rectal exam), lab tests (including fecal occult blood test and CEA test), colonoscopy, x-rays, CT scans, or other tests.

If you have any health problems between checkups, you should contact your doctor.

You may wish to get the NCI booklet Facing Forward Series: Life After Cancer Treatment ¹². It answers questions about follow-up care and other concerns. It also describes how to talk with your doctor about making a plan of action for recovery and future health.

It is natural to want to help yourself feel better. Some people with cancer say that complementary medicine helps them feel better. An approach is called complementary medicine when it is used along with standard treatment. Acupuncture, massage therapy, herbal products, vitamins or special diets, and meditation are examples of such approaches.

Talk with your doctor if you are thinking about trying anything new. Things that seem safe, such as certain herbal teas, may change the way standard treatment works. These changes could be harmful. And some approaches could be harmful even if used alone.

You may find it helpful to read the NCI booklet Thinking About Complementary & Alternative Medicine: A guide for people with cancer ¹³.

You also may request materials from the National Center for Complementary and Alternative Medicine, which is part of the National Institutes of Health. You can reach their clearinghouse at 1-888-644-6226 (voice) and 1-866-464-3615 (TTY). In addition, you can visit their Web site at http://www.nccam.nih.gov.

Living with a serious disease such as colorectal cancer is not easy. You may worry about caring for your family, keeping your job, or continuing daily activities. Concerns about treatments and managing side effects, hospital stays, and medical bills are also common. Doctors, nurses, and other members of your health care team can answer questions about treatment, working, or other activities. Meeting with a social worker, counselor, or member of the clergy also can be helpful if you want to talk about your feelings or concerns. Often, a social worker can suggest resources for financial aid, transportation, home care, or emotional support.

Support groups also can help. In these groups, patients or their family members meet with other patients or their families to share what they have learned about coping with the disease and the effects of treatment. Groups may offer support in person, over the telephone, or on the Internet. You may want to talk with a member of your health care team about finding a support group.

Information Specialists at 1-800-4-CANCER and at LiveHelp ¹ (http://www.cancer.gov/help) can help you locate programs, services, and publications. For a list of organizations offering support, you may want to get the NCI fact sheet "National Organizations That Offer Services to People With Cancer and Their Families."

For tips on coping, you may want to read the NCI booklet Taking Time: Support for People With Cancer ¹⁴.

Doctors all over the country are conducting many types of clinical trials (research studies in which people volunteer to take part). Doctors are studying new ways to prevent, detect, and treat colorectal cancer.

Clinical trials are designed to answer important questions and to find out whether the new approach is safe and effective. Research already has led to advances, and researchers continue to search for more effective approaches.

People who join clinical trials may be among the first to benefit if a new approach is shown to be effective. And if participants do not benefit directly, they may still make an important contribution to medicine by helping doctors learn more about the disease and how to control it. Although clinical trials may pose some risks, researchers do all they can to protect their patients.

If you are interested in being part of a clinical trial, talk with your doctor. You may want to read the NCI booklet Taking Part in Cancer Treatment Research Studies ¹⁵. It explains how clinical trials are carried out and explains their possible benefits and risks.

NCI's Web site includes a section on clinical trials at http://www.cancer.gov/clinicaltrials with general information about clinical trials as well as detailed information about specific ongoing studies of colorectal cancer. The Cancer Information Service at 1-800-4-CANCER or at LiveHelp ¹ at http://www.cancer.gov/help can answer questions and provide information about clinical trials.

Research on Prevention

Research is being done to test whether certain dietary supplements or drugs may help prevent colorectal cancer. For example, researchers across the country are studying vitamin D and calcium supplements, selenium supplements, and the drug celecoxib, in people with polyps.

Research on Screening and Diagnosis

Scientists are testing new ways to check for polyps and colorectal cancer. NCI-supported researchers are studying virtual colonoscopy. This is a CT scan of the colon. It makes x-ray pictures of the inside of the colon.

Research on Treatment

Researchers are studying chemotherapy and biological therapy. They are studying new drugs, new combinations, and different doses. In addition, researchers are looking at ways to lessen the side effects of treatment.

You may want more information for yourself, your family, and your doctor. The following NCI services are available to help you.

Telephone

The NCI's Cancer Information Service (CIS) provides accurate, up-to-date information on cancer to patients and their families, health professionals, and the general public. Information Specialists explain the latest scientific information in plain language and respond in English, Spanish, or on TTY equipment. Calls to the CIS are free.

Telephone: 1-800-4-CANCER (1-800-422-6237)
TTY: 1-800-332-8615

Internet

The NCI's Web site (http://www.cancer.gov) provides information from many NCI sources. It offers current information on cancer prevention, screening, diagnosis, treatment, genetics, supportive care, and ongoing clinical trials. It has information about NCI's research programs and funding opportunities, cancer statistics, and the Institute itself. Information Specialists provide live, online assistance through LiveHelp ¹ at http://www.cancer.gov/help.

The NCI provides information about cancer, including the publications mentioned in this booklet. You can order these materials by telephone, on the Internet, or by mail. You can also read them online and print your own copy.

• By telephone: People in the United States and its territories may order these and other NCI publications by calling the NCI's Cancer Information Service at 1-800-4-CANCER.
• On the Internet: Many NCI publications can be viewed, downloaded, and ordered from http://www.cancer.gov/publications. People in the United States and its territories may use this Web site to order printed copies. This Web site also explains how people outside the United States can mail or fax their requests for NCI booklets.

• By mail: NCI publications can be ordered by writing to the address below:

  Publications Ordering Service
  National Cancer Institute
  Suite 3035A
  6116 Executive Boulevard, MSC 8322
  Bethesda, MD 20892-8322

Cancer of the Colon and Rectum

What You Need To Know About™ Cancer of the Colon and Rectum ¹⁷ (also available in Spanish: Lo que usted necesita saber sobre™ el cáncer de colon y recto ¹⁸)

Screening

Colorectal Cancer Screening: Questions and Answers ⁴ (also available in Spanish: Exámenes selectivos de detección de cáncer colorrectal: preguntas y respuestas ¹⁹)

Treatment and Supportive Care

• Biological Therapy: Treatments That Use Your Immune System to Fight Cancer ⁹
• Chemotherapy and You: A Guide to Self-Help During Cancer Treatment ⁸(also available in Spanish: La quimioterapia y usted: una guía de autoayuda durante el tratamiento del cáncer ²⁰)
• Radiation Therapy and You: A Guide to Self-Help During Cancer Treatment ¹⁰(also available in Spanish: La radioterapia y usted: una guía de autoayuda durante el tratamiento del cáncer ²¹)
• Eating Hints for Cancer Patients: Before, During, and After Treatment ²² (also available in Spanish: Consejos de alimentación para pacientes con cáncer: Antes, durante y después del tratamiento ²³)
• Understanding Cancer Pain ²⁴(also available in Spanish: El dolor relacionado con el cáncer ²⁵)
• Pain Control: A Guide for People with Cancer and Their Families ²⁶(also available in Spanish: Control del dolor: guía para las personas con cáncer y sus familias ²⁷)
• Get Relief from Cancer Pain ²⁸
• Biological Therapies for Cancer: Questions and Answers ²⁹ (also available in Spanish: Terapias biológicas del cáncer: preguntas y respuestas ³⁰)
• How To Find a Doctor or Treatment Facility If You Have Cancer ⁶(also available in Spanish: Cómo encontrar a un doctor o un establecimiento de tratamiento si usted tiene cáncer ³¹)

Living With Cancer

• Facing Forward Series: Life After Cancer Treatment ³²(also available in Spanish: Siga Adelante: la vida después del tratamiento del cáncer ³³)
• Taking Time: Support for People with Cancer ³⁴
• Coping with Advanced Cancer ³⁵
• National Organizations That Offer Services to People With Cancer and Their Families ³⁶ (also available in Spanish: Organizaciones nacionales que brindan servicios a las personas con cáncer y a sus familias ³⁷)

Clinical Trials

• Taking Part in Cancer Treatment Research Studies ¹⁵

Complementary Medicine

• Thinking About Complementary and Alternative Medicine: A Guide for People with Cancer ¹³
• Complementary and Alternative Medicine in Cancer Treatment: Questions and Answers ³⁸ (also available in Spanish: La medicina complementaria y alternativa en el tratamiento del cáncer: preguntas y respuestas ³⁹)

Caregivers

• When Someone You Love Is Being Treated for Cancer: Support for Caregivers ⁴⁰
• When Someone You Love Has Advanced Cancer: Support for Caregivers ⁴¹
• Facing Forward: When Someone You Love Has Completed Cancer Treatment ⁴²

Glossary Terms

The technique of inserting thin needles through the skin at specific points on the body to control pain and other symptoms. It is a type of complementary and alternative medicine.

A noncancerous tumor that starts in gland-like cells of the epithelial tissue (thin layer of tissue that covers organs, glands, and other structures within the body).

A procedure in which a liquid with barium in it is put into the rectum and colon by way of the anus. Barium is a silver-white metallic compound that helps to show the image of the lower gastrointestinal tract on an x-ray.

Not cancer. Benign tumors may grow larger but do not spread to other parts of the body.

Treatment to boost or restore the ability of the immune system to fight cancer, infections, and other diseases. Also used to lessen certain side effects that may be caused by some cancer treatments. Agents used in biological therapy include monoclonal antibodies, growth factors, and vaccines. These agents may also have a direct antitumor effect. Also called biological response modifier therapy, biotherapy, BRM therapy, and immunotherapy.

The removal of cells or tissues for examination by a pathologist. The pathologist may study the tissue under a microscope or perform other tests on the cells or tissue. There are many different types of biopsy procedures. The most common types include: (1) incisional biopsy, in which only a sample of tissue is removed; (2) excisional biopsy, in which an entire lump or suspicious area is removed; and (3) needle biopsy, in which a sample of tissue or fluid is removed with a needle. When a wide needle is used, the procedure is called a core biopsy. When a thin needle is used, the procedure is called a fine-needle aspiration biopsy.

A type of radiation therapy in which radioactive material sealed in needles, seeds, wires, or catheters is placed directly into or near a tumor. Also called implant radiation therapy, internal radiation therapy, and radiation brachytherapy.

A mineral needed for healthy teeth, bones, and other body tissues. It is the most common mineral in the body. A deposit of calcium in body tissues, such as breast tissue, may be a sign of disease.

A term for diseases in which abnormal cells divide without control and can invade nearby tissues. Cancer cells can also spread to other parts of the body through the blood and lymph systems. There are several main types of cancer. Carcinoma is cancer that begins in the skin or in tissues that line or cover internal organs. Sarcoma is cancer that begins in bone, cartilage, fat, muscle, blood vessels, or other connective or supportive tissue. Leukemia is cancer that starts in blood-forming tissue such as the bone marrow, and causes large numbers of abnormal blood cells to be produced and enter the blood. Lymphoma and multiple myeloma are cancers that begin in the cells of the immune system. Central nervous system cancers are cancers that begin in the tissues of the brain and spinal cord.

A substance that is sometimes found in an increased amount in the blood of people who have certain cancers, other diseases, or who smoke. It is used as a tumor marker for colorectal cancer. Also called carcinoembryonic antigen.

A drug that reduces pain. Celecoxib belongs to the family of drugs called nonsteroidal anti-inflammatory agents. It is being studied in the prevention of cancer.

Treatment with drugs that kill cancer cells.

A type of research study that tests how well new medical approaches work in people. These studies test new methods of screening, prevention, diagnosis, or treatment of a disease. Also called clinical study.

A thin, tube-like instrument used to examine the inside of the colon. A colonoscope has a light and a lens for viewing and may have a tool to remove tissue.

Having to do with the colon or the rectum.

An opening into the colon from the outside of the body. A colostomy provides a new path for waste material to leave the body after part of the colon has been removed.

Chronic inflammation of the gastrointestinal tract, most commonly the small intestine and colon. Crohn disease increases the risk for colorectal cancer and small intestine cancer. Also called regional enteritis.

A series of detailed pictures of areas inside the body taken from different angles. The pictures are created by a computer linked to an x-ray machine. Also called CAT scan, computed tomography scan, computerized axial tomography scan, and computerized tomography.

The organs that take in food and turn it into products that the body can use to stay healthy. Waste products the body cannot use leave the body through bowel movements. The digestive system includes the salivary glands, mouth, esophagus, stomach, liver, pancreas, gallbladder, small and large intestines, and rectum.

A procedure in which an endoscope is inserted into the body. An endoscope is a thin, tube-like instrument that has a light and a lens for viewing. A probe at the end of the endoscope is used to bounce high-energy sound waves (ultrasound) off internal organs to make a picture (sonogram). Also called endosonography and EUS.

A health professional trained in the care of persons with stomas, such as colostomies or urostomies.

In food, fiber is the part of fruits, vegetables, legumes, and whole grains that cannot be digested. The fiber in food may help prevent cancer. In the body, fiber refers to tissue made of long threadlike cells, such as muscle fiber or nerve fiber.

A nutrient in the vitamin B complex that the body needs in small amounts to function and stay healthy. Folate helps to make red blood cells. It is found in whole-grain breads and cereals, liver, green vegetables, orange juice, lentils, beans, and yeast. Folate is water-soluble (can dissolve in water) and must be taken in every day. Not enough folate can cause anemia (a condition in which the number of red blood cells is below normal), diseases of the heart and blood vessels, and defects in the brain and spinal cord in a fetus. Folate is being studied with vitamin B12 in the prevention and treatment of cancer. Also called folic acid.

A doctor who specializes in diagnosing and treating disorders of the digestive system.

The functional and physical unit of heredity passed from parent to offspring. Genes are pieces of DNA, and most genes contain the information for making a specific protein.

Analyzing DNA to look for a genetic alteration that may indicate an increased risk for developing a specific disease or disorder.

An enlarged or swollen blood vessel, usually located near the anus or the rectum.

Invasion and multiplication of germs in the body. Infections can occur in any part of the body and can spread throughout the body. The germs may be bacteria, viruses, yeast, or fungi. They can cause a fever and other problems, depending on where the infection occurs. When the body’s natural defense system is strong, it can often fight the germs and prevent infection. Some cancer treatments can weaken the natural defense system.

Redness, swelling, pain, and/or a feeling of heat in an area of the body. This is a protective reaction to injury, disease, or irritation of the tissues.

A thin, tube-like instrument used to look at tissues and organs inside the abdomen. A laparoscope has a light and a lens for viewing and may have a tool to remove tissue.

A machine that uses electricity to form a stream of fast-moving subatomic particles. This creates high-energy radiation that may be used to treat cancer. Also called linac, mega-voltage linear accelerator, and MeV linear accelerator.

Treatment that affects cells in the tumor and the area close to it.

A rounded mass of lymphatic tissue that is surrounded by a capsule of connective tissue. Lymph nodes filter lymph (lymphatic fluid), and they store lymphocytes (white blood cells). They are located along lymphatic vessels. Also called lymph gland.

The tissues and organs that produce, store, and carry white blood cells that fight infections and other diseases. This system includes the bone marrow, spleen, thymus, lymph nodes, and lymphatic vessels (a network of thin tubes that carry lymph and white blood cells). Lymphatic vessels branch, like blood vessels, into all the tissues of the body.

Cancerous. Malignant tumors can invade and destroy nearby tissue and spread to other parts of the body.

A doctor who specializes in diagnosing and treating cancer using chemotherapy, hormonal therapy, and biological therapy. A medical oncologist often is the main health care provider for someone who has cancer. A medical oncologist also gives supportive care and may coordinate treatment given by other specialists.

The spread of cancer from one part of the body to another. A tumor formed by cells that have spread is called a “metastatic tumor” or a “metastasis.” The metastatic tumor contains cells that are like those in the original (primary) tumor. The plural form of metastasis is metastases (meh-TAS-tuh-SEEZ).

Having to do with metastasis, which is the spread of cancer from one part of the body to another.

A type of protein made in the laboratory that can locate and bind to substances in the body, including tumor cells. There are many kinds of monoclonal antibodies. Each monoclonal antibody is made to find one substance. Monoclonal antibodies are being used to treat some types of cancer and are being studied in the treatment of other types. They can be used alone or to carry drugs, toxins, or radioactive materials directly to a tumor.

A procedure in which radio waves and a powerful magnet linked to a computer are used to create detailed pictures of areas inside the body. These pictures can show the difference between normal and diseased tissue. MRI makes better images of organs and soft tissue than other scanning techniques, such as computed tomography (CT) or x-ray. MRI is especially useful for imaging the brain, the spine, the soft tissue of joints, and the inside of bones. Also called magnetic resonance imaging, NMRI, and nuclear magnetic resonance imaging.

A doctor who identifies diseases by studying cells and tissues under a microscope.

A growth that protrudes from a mucous membrane.

Surgery to remove a polyp.

A doctor who specializes in using radiation to treat cancer.

The use of high-energy radiation from x-rays, gamma rays, neutrons, protons, and other sources to kill cancer cells and shrink tumors. Radiation may come from a machine outside the body (external-beam radiation therapy), or it may come from radioactive material placed in the body near cancer cells (internal radiation therapy). Systemic radiation therapy uses a radioactive substance, such as a radiolabeled monoclonal antibody, that travels in the blood to tissues throughout the body. Also called irradiation and radiotherapy.

Giving off radiation.

Something that may increase the chance of developing a disease. Some examples of risk factors for cancer include age, a family history of certain cancers, use of tobacco products, certain eating habits, obesity, lack of exercise, exposure to radiation or other cancer-causing agents, and certain genetic changes.

A mineral that is needed by the body to stay healthy. It is being studied in the prevention and treatment of some types of cancer. Selenium is a type of antioxidant.

A thin, tube-like instrument used to examine the inside of the colon. A sigmoidoscope has a light and a lens for viewing and may have a tool to remove tissue.

The extent of a cancer in the body. Staging is usually based on the size of the tumor, whether lymph nodes contain cancer, and whether the cancer has spread from the original site to other parts of the body.

A surgically created opening from an area inside the body to the outside.

A doctor who removes or repairs a part of the body by operating on the patient.

A procedure to remove or repair a part of the body or to find out whether disease is present. An operation.

Treatment using substances that travel through the bloodstream, reaching and affecting cells all over the body.

An abnormal mass of tissue that results when cells divide more than they should or do not die when they should. Tumors may be benign (not cancer), or malignant (cancer). Also called neoplasm.

A method under study to examine the colon by taking a series of x-rays (called a CT scan) and using a high-powered computer to reconstruct 2-D and 3-D pictures of the interior surfaces of the colon from these x-rays. The pictures can be saved, manipulated to better viewing angles, and reviewed after the procedure, even years later. Also called computed tomography colography.

A type of high-energy radiation. In low doses, x-rays are used to diagnose diseases by making pictures of the inside of the body. In high doses, x-rays are used to treat cancer.