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American Cancer Society Colorectal Cancer Guide
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What Is Cancer?
Cancer develops when cells in a part of the body begin to grow out of control. Although there are many kinds of cancer, they all start because of out-of-control growth of abnormal cells.
Normal body cells grow, divide, and die in an orderly fashion. During the early years of a person’s life, normal cells divide more rapidly until the person becomes an adult. After that, cells in most parts of the body divide only to replace worn-out or dying cells and to repair injuries.
Because cancer cells continue to grow and divide, they are different from normal cells. Instead of dying, they outlive normal cells and continue to form new abnormal cells.
Cancer cells develop because of damage to DNA. This substance is in every cell and directs all its activities. Most of the time when DNA becomes damaged the body is able to repair it. In cancer cells, the damaged DNA is not repaired. People can inherit damaged DNA, which accounts for inherited cancers. Many times though, a person’s DNA becomes damaged by exposure to something in the environment, like smoking.
Cancer usually forms as a tumor. Some cancers, like leukemia, do not form tumors. Instead, these cancer cells involve the blood and blood-forming organs and circulate through other tissues where they grow.
Often, cancer cells travel to other parts of the body, where they begin to grow and replace normal tissue. This process is called metastasis. Regardless of where a cancer may spread, however, it is always named for the place it began. For instance, breast cancer that spreads to the liver is still called breast cancer, not liver cancer.
Not all tumors are cancerous. Benign (non-cancerous) tumors do not spread (metastasize) to other parts of the body and, with very rare exceptions, are not life threatening.
Different types of cancer can behave very differently. For example, lung cancer and breast cancer are very different diseases. They grow at different rates and respond to different treatments. That is why people with cancer need treatment that is aimed at their particular kind of cancer.
Cancer is the second leading cause of death in the United States. Nearly half of all men and a little over one third of all women in the United States will develop cancer during their lifetimes. Today, millions of people are living with cancer or have had cancer. The risk of developing most types of cancer can be reduced by changes in a person’s lifestyle, for example, by quitting smoking and eating a better diet. The sooner a cancer is found and treatment begins, the better are the chances for living for many years.
What Is Colorectal Cancer?
Colorectal cancer is a term used to refer to cancer that develops in the colon or the rectum. The colon and rectum are parts of the digestive system, which is also called the gastrointestinal, or GI, system. The digestive system processes food for energy and rids the body of solid waste matter (fecal matter or stool).
After food is chewed and swallowed, it travels through the esophagus to the stomach. There it is partly broken down and then sent to the small intestine, also known as the small bowel. The word "small" refers to the diameter of the small intestine, which is narrower than that of the large bowel. Actually the small intestine is the longest segment of the digestive system — about 20 feet. The small intestine continues breaking down the food and absorbs most of the nutrients. The small bowel joins the colon in the right lower abdomen. The colon (also called the large bowel or large intestine) is a muscular tube about 5 feet long. The colon continues to absorb water and mineral nutrients from the food matter and serves as a storage place for waste matter. The waste matter left after this process is feces and goes into the rectum, the final 6 inches of the digestive system. From there it passes out of the body through the anus.
The colon has 4 sections:
- The first section is called the ascending colon. It begins where the small bowel attaches to the colon and extends upward on the right side of the abdomen.
- The second section is called the transverse colon since it goes across the body from the right to the left side in the upper abdomen.
- The third section, the descending colon, continues downward on the left side.
- The fourth section is known as the sigmoid colon because of its “S” or “sigmoid” shape. At its end, the sigmoid colon joins the rectum, which in turn joins the anus, or the opening where waste matter, or stool, passes out of the body.
The wall of each of these sections of the colon and rectum has several layers of tissue. Colorectal cancer starts in the innermost layer and can grow through some or all of the other layers. Knowing a little about these layers is important, because the stage (extent of spread) of a colorectal cancer depends to a great degree on how deeply it invades into these layers. For more information, please refer to the staging section of this document.
Colon cancer and rectal cancer, collectively known as colorectal cancer, have many features in common. They will be discussed together in this document except for the section about treatment, where they will each be discussed separately.
In most people, colorectal cancers develop slowly over a period of several years. Before a cancer develops, a growth of tissue or tumor usually begins as a non-cancerous polyp, which may eventually change into cancer. A polyp develops on the lining of the colon or rectum. Certain kinds of polyps, called adenomatous polyps or adenomas, are types that have the potential to become cancerous.
There are other kinds of polyps called hyperplastic and inflammatory polyps. Inflammatory polyps and hyperplastic polyps, in general, do not become pre-cancerous. But some doctors think that some hyperplastic polyps can become pre-cancerous or might be a sign of a greater likelihood of developing adenomatous polyps and cancer, particularly if they grow in the right or ascending colon. Another kind of pre-cancerous condition is called dysplasia. This is usually seen in people with diseases, such as ulcerative colitis or Crohn’s colitis, which cause chronic inflammation of the colon.
Once cancer forms within a polyp, it can eventually begin to grow into the wall of the colon or rectum. When cancer cells are in the wall, they can then grow into blood vessels or lymph vessels. Lymph vessels are thin, tiny channels that carry away waste and fluid. They first drain into nearby lymph nodes, which are bean-shaped structures that help fight against infections. After they spread into blood or lymph vessels, the cancer cells can travel to distant parts of the body. This process of spread is called metastasis.
More than 95% of colorectal cancers are adenocarcinomas. These are cancers of the glandular cells that line the inside layer of the wall of the colon and rectum. The information in this document is about this type of cancer. Other less common types of tumors may also develop in the colon and rectum, such as:
- carcinoid tumors — these tumors develop from specialized hormone-producing cells of the intestine.
- gastrointestinal stromal tumors — these tumors develop from specialized cells in the wall of the colon called the "interstitial cells of Cajal." Some are benign (noncancerous); others are malignant (cancerous). Although these cancers can be found anywhere in the gastrointestinal tract, they are unusual in the colon.
- lymphomas — these are cancers of immune system cells that typically develop in lymph nodes but also may start in the colon and rectum or other organs.
These more rare types of tumors are not covered in this document. Separate documents about gastrointestinal (digestive system) carcinoid and stromal tumors are available from the American Cancer Society. Information on lymphomas of the digestive system is included in the American Cancer Society document, Non-Hodgkin Lymphoma.
What Are the Key Statistics About Colorectal Cancer?
Excluding skin cancers, colorectal cancer is the third most common cancer diagnosed in men and in women in the United States. The American Cancer Society estimates that about 112,340 new cases of colon cancer (55,290 men and 57,050 women) and 41,420 new cases of rectal cancer (23,840 men and 17,580 women) will be diagnosed in 2007.
Colorectal cancer is the second leading cause of cancer-related deaths in the United States and is expected to cause about 52,180 deaths (26,000 men and 26,180 women) during 2007.
The number of deaths from colorectal cancer has been dropping for the past 15 years. There are a number of likely reasons for this. One probable reason is that polyps are being found by screening and removed before they can develop into cancers. Screening is also allowing more colorectal cancers to be found earlier when the disease is easier to cure. In addition, treatment for colorectal cancer has improved over the last 10 years, allowing for more effective options for people diagnosed with this diagnosis. As a result, there are around 1 million survivors of colorectal cancer in the United States.
The 5-year relative survival rate for people whose colorectal cancer is treated in an early stage, before it has spread, is greater than 90%. But only 39% of colorectal cancers are found at that early stage. Once the cancer has spread to nearby organs or lymph nodes, the 5-year relative survival rate goes down, and if cancer has spread to distant organs (i.e., the liver or lung) the 5-year survival is less than 10%.
The 5-year survival rate refers to the percentage of patients who live at least 5 years after their cancer is diagnosed. Many of these patients live much longer than 5 years after diagnosis. But the 5-year survival rate is a standard way of discussing prognosis (outlook). Five-year relative survival rates don’t include patients dying of other diseases. Five-year relative survival rates are considered to be a more accurate way to describe the prognosis for patients with a particular type and stage of cancer. Of course, 5-year rates are based on patients diagnosed and first treated more than 5 years ago. These statistics may no longer be accurate because improvements in treatment may result in a better outlook for more recently diagnosed patients.
What Are the Risk Factors for Colorectal Cancer?
A risk factor is anything that increases your chance of getting a disease such as cancer. Different cancers have different risk factors. For example, unprotected exposure to strong sunlight is a risk factor for skin cancer, and smoking is a risk factor for cancers of the lungs, larynx, mouth, throat, esophagus, kidneys, bladder, colon, and several other organs. Researchers have identified several risk factors that increase a person’s chance of developing colorectal polyps or colorectal cancer.
Age: While younger adults can develop colorectal cancer, your chances of developing colorectal cancer increase markedly after age 50. Over 90% of people diagnosed with colorectal cancer are older than 50.
A personal history of colorectal cancer: If you have had colorectal cancer, even though it has been completely removed, you are more likely to develop new cancers in other areas of the colon and rectum. The chances of this happening are greater if you had your first colorectal cancer when you were age 60 or younger.
A personal history of colorectal polyps: If you have had an adenomatous-type polyp, you are at increased risk of developing colorectal cancer. This is especially true if the polyps are large or if there are many of them.
A personal history of chronic inflammatory bowel disease: Inflammatory bowel disease (IBD), including ulcerative colitis and Crohn’s disease, is a condition in which the colon is inflamed over a long period of time. If you have IBD disease, your risk of developing colorectal cancer is increased. If you have had IBD for 8 years or more, you should undergo colonoscopy testing for colorectal cancer on a frequent basis. Based on your individual case, your doctor may recommend a colonoscopy every 1 to 2 years. Often the first sign that cancer may be developing is called dysplasia. Dysplasia is a term that refers to abnormal cells that have the potential to progress to cancer. Inflammatory bowel disease is different than irritable bowel syndrome (IBS), which does not carry an increased risk for colorectal cancer.
A family history of colorectal cancer: Some cancers can “run in the family” because something in the environment has contributed to the development of cancer and/or because certain family members were born with, or inherited, an increased genetic susceptibility to cancer. While most colorectal cancers occur in people without a family history of colorectal cancer, those with a family history of colorectal cancer or adenomatous polyps in any firstdegree relative younger than age 50, or in 2 or more first-degree relatives at any age are considered at increased risk for the disease. (First-degree relatives are defined as parents, siblings, and children.)
About 15% of people who develop colorectal cancer have disease that is familial. People who have a strong family history of colorectal cancer (as defined above), especially if the relatives are affected before the age of 50, are considered at increased risk of developing this disease. People diagnosed with adenomatous polyps or cancer should inform other family members, and individuals with a family history of colorectal cancer need to talk with their doctor about the possible need to begin colorectal cancer screening at an age younger than that recommended for the general population (50 years).
About 3% to 5% of people who develop colorectal cancer have an inherited genetic susceptibility to the disease. Most of these are associated with the inherited colorectal cancer syndrome, called hereditary non-polyposis colorectal cancer (HNPCC), or Lynch syndrome. A lesser number of colorectal cancer cases are associated with the inherited syndrome, called familial adenomatous polyposis (FAP).
FAP is a disease where people typically develop hundreds of polyps in their colon and rectum. Usually this occurs between the ages of 5 and 40. Cancer usually develops in 1 or more of these polyps beginning at age 20. By age 40, almost all people with this disorder will have developed cancer if preventive surgery is not done. FAP is sometimes associated with Gardner syndrome, a condition that involves benign (non-cancerous) tumors of the skin, soft connective tissue, and bones. About 1% of all colorectal cancers are due to FAP.
Hereditary nonpolyposis colon cancer (HNPCC) is another clearly defined genetic syndrome. It accounts for 3% to 4% of all colorectal cancers. This syndrome also develops when people are relatively young. These people have polyps, but they only have a few, not hundreds as in FAP. Women with this condition also have a very high risk of developing cancer of the endometrium (lining of the upper part of the uterus). Other cancers associated with HNPCC include cancer of the ovary, stomach, small bowel, pancreas, kidney, ureters (tubes that carry urine from the kidneys to the bladder), and bile duct.
Doctors have found that most families with HNPCC have certain characteristics:
- At least 3 relatives have either colorectal cancer or endometrial cancer or one of the other cancers seen with HNPCC.
- Two successive generations are involved.
- At least 1 relative had their cancer when they were younger than age 50.
- At least 2 of the people are first-degree relatives.
These are called the Amsterdam criteria. If any of these hold true for your family, then you might want to seek genetic counseling. But even if your family history satisfies the Amsterdam criteria, it doesn’t mean you have HNPCC. Only about 60% of families who meet the Amsterdam criteria have HNPCC. The other 40% do not; and although their colorectal cancer rate is higher than normal (about 2 times), it is not as high as that of people with HNPCC (about 6 times).
A second set of criteria for HNPCC, which has been recently revised, is called the Bethesda criteria. These are used to determine whether a person with colorectal cancer should have his or her cancer tested for genetic changes that are seen with HNPCC. These criteria include at least one of the following:
- The person is younger than 50 years.
- The person has or had another cancer (endometrial, stomach, pancreas, ovary, kidney or ureters, bile duct) that is associated with HNPCC.
- The person is younger than 60 years and the cancer has certain characteristics seen with HNPCC when viewed under the microscope.
- A first-degree relative has been diagnosed with a colorectal cancer and a noncolorectal cancer often seen in HNPCC carriers (endometrial, stomach, pancreas, ovary, kidney, ureters, or bile duct), and one of these occurred when the person was younger than 50 years.
- The person has 2 or more second-degree relatives who had colorectal cancer and an HNPCC-related tumor at any age.
If a person with colorectal cancer meets the Bethesda criteria, genetic testing will be needed to confirm an inherited HNPCC-associated genetic mutation. The majority of people who meet the Bethesda criteria do not have HNPCC.
Doctors should also be suspicious of HNPCC if, instead of colorectal cancer, the family members have other cancers associated with this gene mutation. These are endometrial cancers, ovarian cancers, small bowel cancers, or cancer of the lining of the kidney or the ureters. Even if one of these cancers has been found, 1 family member younger than age 50 must have been diagnosed with colorectal cancer before a diagnosis of HNPCC is considered.
Accurate identification of families with these inherited syndromes is important. Then doctors can recommend specific steps, such as screening and other preventive measures, at an early age. Because several types of cancer can be associated with inherited colorectal cancer syndromes, all people should check their family medical history for polyps or any type of cancer. Those who develop polyps or cancer should inform other family members. People with a family history of colorectal polyps or cancer should consider genetic counseling, to review their family medical tree and determine whether genetic testing may be right for them. This will help them to make decisions about getting screened and treated at an early age.
Ethnic background: Some studies have concluded that Jews of Eastern European descent (Ashkenazi Jews) have the highest colorectal cancer risk of any ethnic group in the world. Recent research has found several genetic mutations leading to an increased risk of colorectal cancer in this group. This most common of these DNA changes is present in about 6% of American Jews. In one study, about 10% of colorectal cancers in Jews of Eastern European descent were associated with this change called the I1307K APC mutation. However, the genetic mutations discovered so far do not fully account for the increased number of colorectal cancers in Ashkenazi Jews.
Race: African Americans have the highest colorectal cancer incidence and mortality rates of all racial groups in the United States. The reason for this is not yet understood.
A diet mostly from animal sources: A diet that is high in fat, especially fats from animal sources, can increase your risk of colorectal cancer. Over time, eating a lot of red meats and processed meats can increase colorectal cancer risk. The American Cancer Society recommends choosing most of your foods from plant sources and limiting your intake of high-fat foods such as those from animal sources. The American Cancer Society also recommends eating at least 5 servings of fruits and vegetables every day and several servings of other foods from plant sources, such as breads, cereals, grain products, rice, pasta, or beans. Many fruits and vegetables contain substances that interfere with the process of cancer formation.
Physical inactivity: If you are not physically active, you have a greater chance of developing colorectal cancer.
Obesity: If you are very overweight, your risk of dying from colorectal cancer is increased.
Smoking: Recent studies indicate that smokers are 30% to 40% more likely than nonsmokers to die from colorectal cancer. Smoking may be responsible for causing about 12% of fatal colorectal cancers. Almost everyone knows that smoking causes cancers in sites in the body that come in direct contact with the smoke, such as the mouth, larynx, and lungs. However, some of the cancer-causing substances are swallowed and can cause digestive system cancers, such as esophageal and colorectal cancer. Some of these substances are also absorbed into the bloodstream and can increase the risk of developing cancers of the kidneys, bladder, cervix, and other organs.
Alcohol intake: Colorectal cancer has been linked to the heavy use of alcohol. While some of this may be due to the effects of alcohol on folic acid in the body, it still would be wise to avoid heavy alcohol use.
Diabetes: People with diabetes have a 30% increased risk of developing colorectal cancer. They also tend to have a worse prognosis after diagnosis.
Factors With Uncertain, Controversial, or Unproven Effects on Colorectal Cancer
Night-shift work: Results of one single study suggest working a night shift at least 3 nights a month for at least 15 years may increase the risk of colorectal cancer in women. The study authors suggested this might be due to changes in melatonin (a hormone that responds to changes in light) levels in the body. More research is needed to confirm or refute this finding, however.
Other cancers and their treatment: A recent report on testicular cancer survivors found that these men had a higher rate of colorectal cancer. Men who receive radiation therapy for prostate cancer have been reported to have a higher risk of rectal cancer.
The American Cancer Society and several other medical organizations recommend earlier screening for people with increased colorectal cancer risk. These recommendations differ from those generally recommended for people at average risk. For more information, speak with your doctor and refer to the table in the "Can Colorectal Cancer Be Found Early?" section of this document.
Do We Know What Causes Colorectal Cancer?
Although we do not know the exact cause of most colorectal cancers, there are certain known risk factors, and there is a great deal of research going on to find answers to the question.
A small percentage of colorectal cancers are known to be caused by inherited gene mutations (changes in DNA). Recently, scientists have discovered many of these DNA changes, learned how they change the growth control of cells, and determined how the changes can be detected in people before colorectal cancers develop.
Changes in a gene called APC, for example, are responsible for familial adenomatous polyposis (FAP) and Gardner syndrome. This gene is normally responsible for slowing the growth of cells. In patients who have inherited changes in the APC gene, this "brake" on cell growth is turned off and hundreds of polyps develop in the colon. Over time, cancer will nearly always develop in one or more of these polyps because of new gene mutations in the cells of the polyps. We all have these new gene mutations. But they rarely lead to cancer because the cells die instead of continuing to grow as they do when the APC "brake" is turned off.
In addition, a defective DNA repair mechanism is responsible for hereditary nonpolyposis colon cancer (HNPCC). Cells must make a new copy of their DNA each time they divide. Occasional errors are made in copying the DNA code. Fortunately, cells have DNA repair enzymes that act like proofreaders or "spell checkers." Mutations in the DNA repair enzyme genes in HNPCC allow DNA errors to go uncorrected. Mutations in at least four different genes can lead to errors in repair. These errors will sometimes affect growth-regulating genes. This can lead to the development of cancer.
Tests are available that can detect gene mutations associated with FAP and HNPCC. If you have a family history of colorectal cancer or any of the associated cancers discussed above, you should ask your doctor about genetic counseling and genetic testing. The American Cancer Society recommends discussing genetic testing with a qualified genetic counselor before genetic testing is done.
Most people with colorectal cancer do not have an inherited gene mutation. Instead, the gene mutations develop spontaneously. Many doctors think the first mutation occurs in the APC gene. This leads to an increased growth of colorectal cells because of the loss of this “brake” molecule. Another mutation then occurs in the gene called K-RAS and causes this gene to become an “accelerator” of cell growth. Many other mutations eventually occur and lead the cells to grow uncontrollably.
Can Colorectal Cancer Be Prevented?
Even though we do not know the exact cause of most colorectal cancer, it is possible to prevent many colorectal cancers.
Screening: One of the most powerful weapons in preventing colorectal cancer is regular colorectal cancer screening or testing. From the time the first abnormal cells start to grow, it usually takes about 10 to 15 years for them to develop into colorectal cancer. Regular colorectal cancer screening can, in many cases, prevent colorectal cancer altogether. (See the American Cancer Society screening guidelines in the next section, "Can Colorectal Polyps and Cancer Be Found Early?") This is because some polyps, or growths, can be detected and removed before they have the chance to turn into cancer. Screening can also result in finding colorectal cancer early, when it is highly curable.
People who have no identified risk factors (other than age) should begin regular screening at age 50. Those who have a family history or other risk factors for colorectal cancer polyps or cancer need to talk with their doctor about starting screening at a younger age and more frequent intervals.
Diet and exercise: People can lower their risk of developing colorectal cancer by managing the risk factors that they can control, such as diet and physical activity. It is important to eat plenty of fruits, vegetables, and whole grain foods and to limit intake of high-fat foods. Physical activity is another area that people can control. The American Cancer Society recommends at least 30 minutes, preferably 45 to 60, of physical activity on 5 or more days of the week. If you participate in moderate or vigorous activity for 45 minutes on 5 or more days of the week, you can lower your risk for breast and colorectal cancer even more. If you are overweight, you can ask your doctor about a weight loss plan that will work for you. For more information about diet and physical activity, refer to the American Cancer Society document, American Cancer Society Guidelines for Nutrition and Physical Activity for Cancer Prevention.
Vitamins, calcium, magnesium: Some studies suggest that taking a daily multivitamin containing folic acid, or folate, can lower colorectal cancer risk. Other studies suggest that increasing calcium intake may lower risk. Some have suggested that vitamin D, which you can get from sun exposure or in a vitamin pill, can lower colorectal cancer risk. Of course, excessive sun exposure can cause skin cancer and is not recommended as a way to lower colorectal cancer risk. Calcium and vitamin D may work together to reduce colorectal cancer risk, as vitamin D aids in the body’s absorption of calcium. In addition, one recent study suggested that a diet high in magnesium may also reduce colorectal cancer risk in women.
Nonsteroidal anti-inflammatory drugs: Many studies have found that people who regularly use aspirin and other nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen (Motrin, Advil) and naproxen (Aleve), have a 20% to 50% lower risk of colorectal cancer and adenomatous polyps. Most of these studies, however, are based on observations of people who took these medications for reasons such as treatment of arthritis or prevention of heart attacks. Two recent studies have provided even stronger evidence regarding the ability of aspirin to prevent the growth of polyps. The advantage of these recent studies is that people were randomly selected by the researchers to receive either aspirin or an inactive placebo. One study included people who were previously treated for early stages of colorectal cancer, and the other study included people who previously had polyps removed.
But NSAIDs can cause serious or even life-threatening bleeding from stomach irritation. Currently available information suggests that the risks of serious bleeding outweigh the benefits of these medicines for the general public. For this reason, experts do not recommend NSAIDs as a cancer-prevention strategy for people at average risk of developing colorectal cancer. However, the value of these drugs for people at increased colorectal cancer risk is being actively studied. Celecoxib (Celebrex) has been approved by the US Food and Drug Administration for reducing polyp formation in people with FAP. One advantage of this drug is that it causes less bleeding in the stomach. However, celecoxib may increase the risk of heart attacks and strokes. A similar drug, rofecoxib (Vioxx), was taken off the market because people who took it had an increased number of heart attacks and strokes. Please check with your doctor before beginning to take aspirin and other NSAIDs on a regular basis.
Female hormones: Hormone replacement therapy (HRT) in postmenopausal women may reduce their risk of developing colorectal cancer. But those women on HRT who do develop colorectal cancer may have a fast growing cancer.
HRT also lowers the risk of developing osteoporosis, but it may increase the risk of heart disease, blood clots, and breast and uterine cancers. For these reasons, the decision to use HRT should be based on a careful discussion of benefits and risks with your doctor.
Other factors: There are other risk factors that can’t be controlled, such as a strong family history of colorectal cancer. But even when people have a history of colorectal cancer in their family, they may be able to prevent the disease. For example, people with a family history of colorectal cancer may benefit from starting screening tests when they are younger and having them done more often than people without this risk factor.
Genetic tests can help determine which members of certain families have inherited a high risk for developing colorectal cancer. Without genetic testing, all members of a family known to have an inherited form of colorectal cancer should be screened early and frequently. However, with genetic testing, family members who are found not to have inherited the mutated gene can be screened with the same frequency as people at average risk.
People with FAP should start colonoscopy during their teens. Most doctors recommend they have their colon removed when they are in their 20s to prevent cancer from developing.
The lifetime risk of developing colorectal cancer for people with HNPCC is about 80% compared to near 100% for those with FAP. Doctors recommend that people with HNPCC start colonoscopy screening during their 20s to remove any polyps and find any cancers at the earliest possible stage. People known to carry the genetic mutation associated with HNPCC may be offered the option of yearly screening with colonoscopy or removal of most of the colon.
Ashkenazi Jews with the I1307K APC mutation have an increased colorectal cancer risk, but do not develop these cancers when they are very young. And, as a group overall, Ashkenazi Jews (even those without the I1307K APC mutation) are more likely to develop colorectal cancer than other ethnic groups. For these reasons, most doctors recommend that they carefully follow the usual recommendations for colorectal cancer screening, but earlier or more frequent testing is usually not suggested.
Since some colorectal cancers can’t be prevented, finding the disease early is the best way to improve the chance of a cure and reduce the number of deaths caused by this disease.
In addition to the screening recommendations for people at average colorectal cancer risk, the American Cancer Society has additional guidelines for people at moderate and high risk of colorectal cancer. These recommendations are described in the section, "Can Colorectal Cancer Be Found Early?" Ask your doctor how these guidelines might apply to you.
Can Colorectal Polyps and Cancer Be Found Early?
Colorectal Cancer Screening
Screening, or testing, is done while you are feeling well — to find, any abnormalities early, before signs and symptoms of disease occur. Screening for colorectal cancer allows for the early detection of cancer when it is highly curable, as well as the detection of growths (polyps) that might eventually become cancer. These polyps may be removed, preventing the development of cancer altogether. There are several tests used to screen for colorectal cancer:
Fecal occult blood test: The fecal occult blood test (FOBT) is used to find occult (hidden) blood in feces. Blood vessels at the surface of colorectal polyps or cancers are often fragile and easily damaged by the passage of feces. The damaged vessels usually release a small amount of blood into the feces. Only rarely is there enough bleeding to color the stool red. The FOBT detects blood through a chemical reaction. The traditional version of this test cannot tell whether blood is from the colon or from other portions of the digestive tract (i.e., the stomach). Therefore, if this test is positive, a colonoscopy is needed to see if there is a cancer, polyp, or other cause of bleeding such as ulcers, hemorrhoids, diverticulosis (tiny pouches that form at weak spots in the colon wall), or inflammatory bowel disease (colitis). Even some foods or drugs can affect the test, so some doctors suggest that you should try to avoid the following with this test:
- nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen (Advil), naproxen (Aleve), or aspirin (more than 1 adult aspirin per day), for 7 days before testing (they can cause bleeding)
- vitamin C in excess of 250 mg daily from either supplements or citrus fruits, and juices for 3 days before testing (they can affect the chemicals in the test and make it show negative)
- red meats for 3 days before testing (components of blood in the meat may cause the test to show positive)
Some people never do the FOBT test or don’t give it to their doctor because they worry that something they ate may interfere with the test. For this reason, many doctors tell their patients it isn’t essential to follow these restrictions in their diet. The most important thing is to get the test done. People should try to avoid taking aspirin or related drugs for minor aches. But if you take these medicines daily for heart problems or other conditions, don’t stop them for this test without approval from your doctor.
People having this test will receive a kit with instructions from their doctor’s office or clinic. The kit will explain how to take a stool or feces sample at home (usually 3 specimens smeared onto a small square of paper). The kit is then returned to the doctor’s office or a medical laboratory for testing. It is not necessary that the kit be returned immediately because the test is still accurate if the smeared feces have dried. This is a take-home kit that is used in the privacy of your own home. An FOBT done during a digital rectal exam in the doctor’s office is not sufficient for screening. If the FOBT is positive for blood, then a colonoscopy need to be done to determine the cause of the blood. An FOBT done during a digital rectal exam in the doctor’s office is not sufficient for colorectal cancer screening.
Immunochemical fecal occult blood test: A newer kind of stool blood test kit, known as an immunochemical fecal occult blood test (iFOBT) or fecal immunochemical test (FIT), also detects occult (hidden blood) in the stool — the “globin” part of the hemoglobin molecule. This test is done essentially the same way as FOBT, but it is more specific and reduces the number of false positive results. Vitamins or foods do not affect the iFOBT or FIT, so people may find it easier to use. The iFOBT may not detect a tumor that is not bleeding and multiple stool samples should be tested. If the results are positive for hidden blood, a colonoscopy is required to investigate further.
Flexible sigmoidoscopy: A sigmoidoscope is a slender, flexible, hollow, lighted tube about the thickness of a finger. It is inserted through the rectum and into the lower part of the colon. Your doctor can look through this scope, and, the scope can be connected to a video camera and display monitor for a better view. Using the sigmoidoscope, your doctor can view the inside of the rectum and part of the colon to detect any abnormality. Because the sigmoidoscope is only 60 centimeters (around 2 feet) long, the doctor is able to see the entire rectum but less than half of the colon with this procedure. Before the sigmoidoscopy, you will need to have a bowel preparation to clean out your lower colon. If a small polyp is found your doctor may remove it. If an adenomatous polyp or colorectal cancer is found during the procedure, you will need to have a colonoscopy to look for polyps or cancer in the rest of the colon. This test may be uncomfortable, but it should not be painful.
Colonoscopy: A colonoscope is a longer version of a sigmoidoscope. It is inserted through the rectum and allows your doctor to see the lining of the rectum and the entire colon. The colonoscope is also connected to a video camera and display monitor so the doctor can see and closely examine the inside of the colon.
If a small polyp is found, your doctor may remove it. Some polyps, even those that are not cancerous, can eventually become cancerous. For this reason, they are usually removed. This is done by passing a wire loop through the colonoscope to cut the polyp from the wall of the colon with an electrical current. The polyp can then be sent to a lab to be checked under a microscope to see if it has any areas that have changed into cancer.
If your doctor sees a large polyp or tumor or any other abnormality, a biopsy may be done. In this procedure, a small piece of tissue is taken out through the colonoscope. Examination of the tissue can help determine if it is a cancer, a benign (non-cancerous) growth, or a result of inflammation.
If you have a colonoscopy, you will need to follow a clear-liquid diet (water, apple juice, clear broths, and any gelatin except red or purple) the day before and the day of the procedure. Your instructions should tell you the exact time to stop solid foods. Clear broth, ginger ale, and most soft drinks or sports drinks are usually allowed unless they have red or purple food colorings which can discolor the colon. You will also be required to take laxatives the day before the test and possibly an enema that morning to allow for a clear view of the colon. Before the colonoscopy begins, you will be given a sedating medicine through a vein to make you feel comfortable and sleepy during the procedure. Colonoscopy may be done in a hospital outpatient department or ambulatory care center and usually takes 15 to 30 minutes, although it may take longer if a polyp needs to be removed.
Although colonoscopy is a safe procedure, on rare occasions the colonoscope can puncture the wall of the colon or rectum. This is called a perforation and can be a serious complication and at times requires surgical repair. Talk to your doctor about the risk of this complication.
Barium enema with air contrast: This procedure is also called a double-contrast barium enema. Barium sulfate, a chalky substance, is used to partially fill and open up the colon. The barium sulfate is given through a small tube placed in the anus. When the colon is about halffull of barium, you will be turned on the x-ray table so the barium spreads throughout the colon. Then air will be pumped into your colon through the same tube to make it expand. This produces the best pictures of your colon and allows the doctor to see large polyps and cancers. If an abnormality is seen with the barium enema you will need to have a colonoscopy. You will need to take laxatives the night before and have an enema the morning of the procedure.
Virtual colonoscopy: This can be thought of as a super x-ray of the colon and rectum. The preparation is the same as for a barium enema x-ray or colonoscopy. Air is pumped into the colon to distend it. Then a special CT scan called helical CT or spiral CT is done. This test is probably more accurate than the barium enema but not quite as good as colonoscopy for finding very small polyps. The potential advantages are believed to be that the test can be done quickly, with no sedation, and possibly at a lower cost than colonoscopy. A disadvantage is that if a polyp or growth is found, a colonoscopy must be done for biopsy or polyp removal. Virtual colonoscopy is still being studied and is currently not included among the tests recommended by the American Cancer Society or other major medical organizations as a screening test for colorectal cancer polyps or for the early detection of colorectal cancer.
Stool DNA test: Researchers know of DNA mutations that often affect certain genes (such as the APC gene, K-ras oncogene, and p53 tumor suppressor gene) in colorectal cancer cells. Studies are testing new ways to recognize these DNA mutations in cells found in stool samples to see if this screening approach is useful in finding large polyps and colorectal cancers at an earlier stage.
Cells from the lining layer of the colon and rectum are constantly shed into the stool and replaced by new cells. The cells that slough off the lining typically undergo apoptosis, a specific type of cell death that causes recognizable changes in the cells’ DNA. Cells that slough off from the surface of colon cancers do not usually undergo these changes. Finding intact-appearing DNA (that lacks the changes of apoptosis) in stool samples appears to be useful in finding colorectal cancers. Recent studies that have combined DNA tests to look for gene mutations and for intact-appearing DNA have shown promising results. Nonetheless, more research is needed to confirm the accuracy of these tests before widespread use can be recommended.
American Cancer Society Colorectal Cancer Screening Guidelines
Beginning at age 50, men and women who are at average risk for developing colorectal cancer should have 1 of the 5 screening options below:
- a fecal occult blood test (FOBT)* or fecal immunochemical test (FIT)* every year**, OR
- flexible sigmoidoscopy every 5 years, OR
- an FOBT* or FIT* every year plus flexible sigmoidoscopy every 5 years**, OR (Of these first 3 options, the combination of FOBT or FIT every year plus flexible sigmoidoscopy every 5 years is preferable.)
- double-contrast barium enema every 5 years**, OR
- colonoscopy every 10 years
*For FOBT or FIT, the take-home multiple sample method should be used. **Colonoscopy should be done if the FOBT or FIT shows blood in the stool, if sigmoidoscopy results show an adenomatous polyp or cancer, or if double-contrast barium enema studies show anything abnormal. If possible, polyps should be removed during the colonoscopy.
In a digital rectal examination (DRE), a doctor examines your rectum with the gloved end of his/her finger. Although a DRE is often included as part of a routine physical exam, it is not recommended as a stand-alone test for colorectal cancer. However, your doctor should do a DRE before inserting the sigmoidoscope or colonoscope. This simple test, which is not usually painful, can detect masses in the anal canal or lower rectum. By itself, however, it is not a very sensitive test for detecting colorectal cancer due to its limited reach. Doctors often find a small amount of stool when performing a DRE. However, simply checking stool obtained in this fashion for evidence of bleeding with an FBOT or FIT (iFOBT) is not an acceptable method of screening for colorectal cancer. Research has shown that this type of stool exam will miss more than 90% of colon abnormalities, including cancers.
If you are at an increased risk, or higher than average risk, of colorectal cancer, you should begin colorectal cancer screening earlier and/or be screened more often. The following conditions place you at higher than average risk:
- a personal history of colorectal cancer or adenomatous polyps
- a personal history of chronic inflammatory bowel disease
- a strong family history of colorectal cancer or polyps (cancer or polyps in a firstdegree relative [parent, sibling, or child] younger than 50, or in 2 first-degree relatives of any age)
- a known family history of hereditary colorectal cancer syndromes (familial adenomatous polyposis or hereditary nonpolyposis colon cancer)
The table on the next page suggests screening guidelines for those with an increased or high risk of colorectal cancer, based on specific risk factors. Some people may have more than 1 risk factor. Please refer to the table and discuss these recommendations with your doctor. Based on your individual situation and any risk factors you may have, your doctor can suggest which screening option is best for you as well as any modifications in the schedule based on your individual risk.
If you are a woman who has a family history of HNPCC, you have a very high risk of developing endometrial cancer, cancer of the lining of the uterus. Because there is not a practical and effective method to screen for endometrial cancer, many experts recommend a hysterectomy after child bearing age for women who are known to have HNPCC.
|American Cancer Society Guidelines on Screening and Surveillance for the Early Detection of Colorectal Adenomas and Cancer — Women and Men at Increased Risk or at High Risk|
|Risk Category||Age to Begin||Recommendation||Comment|
|People with a single, small (‹ 1 cm) adenoma||3-6 years after the initial polypectomy||Colonoscopy 1||If the exam is normal, the patient can thereafter be screened as per average risk guidelines.|
|People with a large (1 cm +) adenoma, multiple adenomas, or adenomas with high-grade dysplasia or villous change||Within 3 years after the initial polypectomy||Colonoscopy 1||If normal, repeat examination in 3 years; If normal then, the patient can thereafter be screened as per average risk guidelines.|
|Personal history of curative-intent resection of colorectal cancer||Within 1 year after cancer resection||Colonoscopy 1||If normal, repeat examination in 3 years; If normal then, repeat examination every 5 years.|
|Either colorectal cancer or adenomatous polyps, in any first-degree relative before age 50, or in two or more first-degree relatives at any age (if not a hereditary syndrome)||Age 40, or 10 years before the youngest case in the immediate family, whichever is earlier||Colonoscopy 1||Every 5-10 years. Colorectal cancer in relatives more distant than first-degree does not increase risk substantially above the average risk group.|
|Family history of familial adenomatous polyposis (FAP)||Puberty||Early surveillance with endoscopy, and counseling to consider genetic testing||If the genetic test is positive, colectomy is indicated. These patients are best referred to a center with experience in the management of FAP.|
|Family history of hereditary nonpolyposis colon cancer (HNPCC)||Age 21||Colonoscopy and counseling to consider genetic testing||If the genetic test is positive or if the patient has not had genetic testing, every 1-2 years until age 40, then annually. These patients are best referred to a center with experience in the management of HNPCC.|
|Inflammatory bowel disease -Chronic ulcerative colitis-Crohn’s disease||Cancer risk begins to be significant 8 years after the onset of pancolitis, or 12-15 years after the onset of left-sided colitis||Colonoscopy with biopsies for dysplasia||Every 1-2 years. These patients are best referred to a center with experience in the surveillance and management of inflammatory bowel disease.|
If colonoscopy is unavailable, not feasible, or not desired by the patient, double-contrast barium enema (DCBE) alone, or the combination of flexible sigmoidoscopy and DCBE are acceptable alternatives. Adding flexible sigmoidoscopy to DCBE may provide a more comprehensive diagnostic evaluation than DCBE alone in finding significant lesions. A supplementary DCBE may be needed if a colonoscopic exam fails to reach the cecum, and a supplementary colonoscopy may be needed if a DCBE identifies a possible lesion, or does not adequately visualize the entire colon and rectum.
Medicare Coverage for Colorectal Screening What Colorectal Cancer Screening Does Medicare Cover?
- fecal occult blood test (FOBT) or fecal immunochemical test (FIT) yearly for all Medicare beneficiaries 50 years and older
- flexible sigmoidoscopy every 4 years for beneficiaries 50 years and older who are at average risk
- colonoscopy every 2 years for all beneficiaries at high risk
- colonoscopy once every 10 years for beneficiaries age 50 and older who are at average risk
- double-contrast barium enema (DCBE) as an alternative if a physician determines that its screening value is equal to or better than flexible sigmoidoscopy or colonoscopy
What Would a Medicare Beneficiary Expect to Pay for a Colorectal Cancer Screening Test?
- FOBT/FIT: People age 50 years or older with Medicare pay no coinsurance and no Part B deductible.
- Flexible sigmoidoscopy: Patient pays 20% of Medicare-approved amount after the yearly Part B deductible.
- Colonoscopy: Patient pays 20% of Medicare-approved amount after the yearly Part B deductible.
- DCBE: When substituted for flexible sigmoidoscopy or colonoscopy, patient pays 20% of Medicare-approved amount after the yearly Part B deductible.
How Is Colorectal Cancer Diagnosed?
Most people with early colon cancer have no symptoms of the disease. Symptoms usually appear only with more advanced disease. This is why undergoing the recommended screening tests — before any symptoms develop — is so important. If your doctor finds something suspicious during a screening exam, or if you have any of the symptoms of colorectal cancer, you will need to undergo a diagnostic workup.
If you have any such symptoms, please see your doctor immediately. He or she will need to take a complete medical history and perform a physical exam to determine the cause of your symptoms. More tests may be done to find out if you have colorectal cancer, or a different condition that may have some of the same symptoms.
Signs and Symptoms of Colorectal Cancer If you have any of the following you should check with your doctor for prompt diagnosis and treatment:
- a change in bowel habits, such as diarrhea, constipation, or narrowing of the stool, that lasts for more than a few days
- a feeling that you need to have a bowel movement that is not relieved by doing so
- rectal bleeding or blood in the stool (often, though, the stool will look normal)
- cramping or steady abdominal (stomach area) pain
- weakness and fatigue
Other conditions, such as infection, hemorrhoids, and inflammatory bowel disease, can also cause these symptoms. But only a doctor can determine their cause. It is important to talk to your doctor since finding colorectal cancer early makes successful treatment more likely. It is also possible to have colon cancer and not have any symptoms. If the doctor suspects colon cancer, you will need to have more tests done. Remember that most people with colorectal cancer have normal-looking stool.
Whether you are undergoing diagnosis because of the results of a screening exam or because you have symptoms, your doctor may perform the following:
Medical history and physical exam: When your doctor "takes a history," he or she will ask you a series of questions about your symptoms and risk factors, including your family history. Your doctor will carefully examine your abdomen to feel for masses or enlarged organs, and also examine the rest of your body. Your doctor may also perform a digital rectal exam (DRE).
Sigmoidoscopy, barium enema, double-contrast barium enema, colonoscopy: Your doctor may recommend one or more of these tests to further investigate a suspicious finding or determine the cause of your symptoms.
Blood tests: Your doctor may also order a blood count. This will determine whether you have anemia (too few red blood cells). Many people with colorectal cancer become anemic because of prolonged bleeding from the tumor. You may also have a blood test of your liver function, because colorectal cancer can spread to the liver and cause abnormalities.
In addition, colorectal cancer produces substances, such as carcinoembryonic antigen (CEA) and CA 19-9, that are released into the bloodstream. Blood tests for these "tumor markers" are used most often with other tests for follow-up of patients who already have been treated for colorectal cancer. They may provide an early warning of a cancer that has returned.
These tumor markers are not used to find cancer in people who have never had a cancer and appear to be healthy. Tumor marker levels can be normal in a person who has cancer and can be abnormal for reasons other than cancer. For example, higher levels may also be present in the blood of some people with ulcerative colitis, noncancerous tumors of the intestines, or some types of liver disease or chronic lung disease. Smoking can also raise CEA levels.
Biopsy: Usually if a suspected colorectal cancer is found by any diagnostic test, it is biopsied during colonoscopy. In a biopsy, the doctor removes a small piece of tissue with a special instrument passed through the scope. Although there may be some bleeding afterward, this is generally harmless. The biopsy specimen is sent to the pathology laboratory where a pathologist, a doctor especially trained to diagnose cancer and other diseases in tissue samples, examines the tissue under a microscope.
Ultrasound: Ultrasound involves the use of sound waves and their echoes to produce a picture of internal organs or masses. A small microphone-like instrument called a transducer emits sound waves. These high-frequency sound waves are transmitted into the area of the body being studied and echoed back. The sound wave echoes are picked up by the transducer and converted by a computer into an image that is displayed on a computer screen. Abdominal ultrasound can be used to look for tumors in your liver, gallbladder, pancreas, or even inside your abdomen. It can’t look for tumors of the colon.
This is a very easy procedure. It uses no radiation, which is why it is frequently used to look at developing fetuses. When you undergo an ultrasound exam, you simply lie on a table and a technician moves the transducer over the skin overlying the part of your body being examined. Usually, the skin is first lubricated with oil.
Two special types of ultrasound exams can be used to evaluate people with colon and rectal cancer. Endorectal ultrasound uses a special transducer that can be inserted directly into the rectum. This test is used to see how far through the wall a rectal cancer may have penetrated and whether it has spread to nearby organs or tissues such as lymph nodes. Intraoperative ultrasound is done after the surgeon has opened the abdominal cavity. The transducer can be placed against the surface of the liver, making this test very useful in detecting metastases of colorectal cancer to the liver.
Computed tomography (CT): The CT scan is an x-ray procedure that produces detailed cross-sectional images of your body. Instead of taking one picture, like a conventional x-ray, a CT scanner takes many pictures as it rotates around you. A computer then combines these pictures into an image of a slice of your body. The machine will take pictures of multiple slices of the part of your body that is being studied. This test can help tell if your colon cancer has spread into your liver or other organs. Often after the first set of pictures is taken you will receive an intravenous (IV) injection of a dye (a contrast agent) that helps outline structures in your body. A second set of pictures is then taken. You may be asked to drink 1 to 2 pints of a solution of contrast material. This helps outline the intestine so that it is not mistaken for tumors.
A special kind of CT, the spiral CT, uses a special scanner that can provide greater detail and is sometimes useful in finding metastases from colorectal cancer. For spiral CT with portography (looking at the portal vein — the large vein leading into the liver from the intestine), contrast material is injected into veins that lead to the liver, to help find metastases from colorectal cancer to that organ.
CT scans can also be used to precisely guide a biopsy needle into a suspected metastasis. For this procedure, called a CT-guided needle biopsy, the patient remains on the CT scanning table, while a radiologist advances a biopsy needle toward the location of the mass. CT scans are repeated until the doctors are confident that the needle is within the mass. A fine-needle biopsy sample (tiny fragment of tissue) or a core needle biopsy sample (a thin cylinder of tissue about ½ inch long and less than 1/8 inch in diameter) is removed and examined under a microscope.
CT scans are more tedious than regular x-rays because they take longer and you need to lie still on a table while they are being done. But they are getting faster and your stay might be pleasantly short. Also, you might feel a bit confined by the ring you lie within when the pictures are being taken.
You will need to put up with the intravenous (IV) line through which the contrast dye is injected. The injection can also cause some flushing. Some people are allergic and get hives or, rarely, more serious reactions like trouble breathing and low blood pressure. Please be sure to tell the doctor if you have ever had a reaction to any contrast material used for x-rays.
A new application of the CT is to perform a "virtual colonoscopy." After cleansing the stool from the colon and filling the colon with air, a computer-assisted reconstruction of the colon from CT images is possible. It requires the same preparation as for a colonoscopy. Also, the colon is inflated with air so that it can be viewed more clearly; this stretches the colon and can cause some discomfort. If abnormalities are detected, a follow-up colonoscopy will be required to take tissue samples of the abnormal areas. Virtual colonoscopy is also being used for screening by some doctors, but this isn’t recommended by the American Cancer Society except in clinical trials or if colonoscopy can’t be done (for example, because of certain medical problems that would make the sedative used with colonoscopy unsafe for that patient).
Magnetic resonance imaging (MRI): MRI scans involve the use of radio waves and strong magnets instead of x-rays. The energy from the radio waves is absorbed and then released in a pattern formed by the type of tissue and by certain diseases. A computer translates the pattern of radio waves given off by the tissues into a detailed image of parts of the body. Not only does this produce cross-sectional slices of the body like a CT scanner, it can also produce slices that are parallel with the length of your body. A contrast material might be injected just as with CT scans, but is used less often. Although in the past, MRI hasn’t been very useful in people with colorectal cancer, newer techniques have been developed that might make it useful for evaluating rectal cancers.
MRI scans are particularly helpful in examining the brain and spinal cord. MRI scans are a little more uncomfortable than CT scans. First, they take longer — often up to an hour. Also, you often have to be placed inside a tube, which is confining and can upset people with a fear of enclosed spaces. The machine also makes a thumping noise, but some places will provide headphones with music to block this out.
Chest x-ray: This test may be done to determine whether colorectal cancer has spread to the lungs.
Positron emission tomography (PET): PET scans involve the use of glucose (a form of sugar) that contains a radioactive atom. A small amount of the radioactive material is injected into your arm. Then you are put into the PET machine where a special camera can detect the radioactivity. Because of their high rate of metabolism, cancer cells absorb large amounts of the radioactive sugar. PET is useful when your doctor thinks the cancer has spread, but doesn’t know to where. PET scans can be used instead of several different x-rays because it scans your whole body and may find spread of the cancer where CT scans haven’t. PET scans have become more accurate because newer devices combine the PET scan with a CT scan. This test is known as integrated PET/CT.
Angiography: For this test, doctors insert a very thin tube into a blood vessel that goes to the area to be studied. Contrast dye is injected rapidly and a series of x-ray images is then taken. This can show surgeons the location of blood vessels next to a liver metastasis from colorectal cancer, so that they can remove the metastasis without causing a lot of bleeding.
How Is Colorectal Cancer Staged?
Staging is a process that tells the doctor how widespread your cancer may be at the time of diagnosis. It will show whether the cancer has spread and how far. The treatment and outlook for colorectal cancer depends, to a large extent, on its stage. For early cancer, surgery may be all that is needed. For more advanced cancer, other treatments, such as chemotherapy or radiation therapy, may be required. Please be sure to ask your doctor to explain the stage of your cancer so that you can make the best choices about your treatment.
More than one system is used for staging colorectal cancer. These include the Dukes, Astler- Coller, and AJCC/TNM systems. This section concentrates on American Joint Committee on Cancer (AJCC) system (also called the TNM system), which describes stages using Roman numerals I through IV. Both the Dukes system and the Astler-Coller system use A through C; the Astler-Coller system adds stage D and has more subdivisions.
All 3 systems describe the spread of the cancer in relation to the layers of the wall of the colon or rectum, organs next to the colon and rectum, and other organs farther away. Because for most patients, this stage is unknown until after surgery, most doctors wait till then to decide on the cancer’s stage. The stages described below are called pathologic stages. The pathologic stage is determined by the findings of the pathologist from looking at the cancer and other actual tissue that has been removed.
The AJCC/TNM System describes the extent of the primary Tumor (T), the absence or presence of metastasis to nearby lymph Nodes (N), and the absence or presence of distant Metastasis (M).
T Categories for Colorectal Cancer
T categories of colorectal cancer describe the extent of spread through the layers that form the wall of the colon and rectum. These layers, from the inner to the outer, include the lining (mucosa), a thin layer of muscle (muscularis mucosa), the fibrous tissue beneath this muscle layer (submucosa), a thick layer of muscle that contracts to force the contents of the intestines along (muscularis propria), and the thin outermost layers of connective tissue (subserosa and serosa) that cover most of the colon but not the rectum.
- Tx: No description of the tumor’s extent is possible because of incomplete information.
- Tis: The cancer is in the earliest stage. It involves only the mucosa. It has not grown beyond the muscularis mucosa (inner muscle layer) of the colon or rectum. This stage is also known as carcinoma in situ or intramucosal carcinoma.
- T1: The cancer has grown through the muscularis mucosa and extends into the submucosa.
- T2: The cancer has grown through the submucosa and extends into the muscularis propria.
- T3: The cancer has grown completely through the muscularis propria into the subserosa but not to any neighboring organs or tissues.
- T4: The cancer has spread completely through the wall of the colon or rectum into nearby tissues or organs.
N Categories for Colorectal Cancer
N categories indicate whether or not the cancer has spread to nearby lymph nodes and, if so, how many lymph nodes are involved.
- Nx: No description of lymph node involvement is possible because of incomplete information.
- N0: No lymph node involvement is found.
- N1: Cancer cells found in 1 to 3 nearby lymph nodes.
- N2: Cancer cells found in 4 or more nearby lymph nodes.
M Categories for Colorectal Cancer
M categories indicate whether or not the cancer has spread to distant organs, such as the liver, lungs, or distant lymph nodes.
- Mx: No description of distant spread is possible because of incomplete information.
- M0: No distant spread is seen.
- M1: Distant spread is present.
Once a person’s T, N, and M categories have been determined, usually after surgery, this information is combined in a process called stage grouping to determine the stage, expressed in Roman numerals from stage I (the least advanced stage) to stage IV (the most advanced stage). The following guide illustrates how TNM categories are grouped together into stages:
Stage 0: Tis, N0, M0: The cancer is in the earliest stage. It has not grown beyond the inner layer (mucosa) of the colon or rectum. This stage is also known as carcinoma in situ or intramucosal carcinoma.
Stage I: T1, N0, M0, or T2, N0, M0: The cancer has grown through the muscularis mucosa into the submucosa or it may also have grown into the muscularis propria, but it has not spread into nearby lymph nodes or distant sites.
Stage IIA: T3, N0, M0: The cancer has grown through the wall of the colon or rectum into the outermost layers. It has not yet spread to the nearby lymph nodes or distant sites.
Stage IIB: T4, N0, M0: The cancer has grown through the wall of the colon or rectum into other nearby tissues or organs. It has not yet spread to the nearby lymph nodes or distant sites.
Stage IIIA: T1-2, N1, M0: The cancer has grown through the mucosa into the submucosa or it may also have grown into the muscularis propria, and it has spread to 1-3 nearby lymph nodes but not distant sites.
Stage IIIB: T3-4, N1, M0: The cancer has grown through the wall of the colon or rectum or into other nearby tissues or organs and has spread to 1-3 nearby lymph nodes but not distant sites.
Stage IIIC: Any T, N2, M0: The cancer can be any T but has spread to 4 or more nearby lymph nodes but not distant sites.
Stage IV: Any T, Any N, M1: The cancer can be any T, any N, but has spread to distant sites such as the liver, lung, peritoneum (the membrane lining the abdominal cavity), or ovary.
Comparison of AJCC, Dukes, and Astler-Coller Stages
If your stage is reported in letters rather than numbers, this table can be used to find the matching AJCC/TNM stage. As you can see, the Dukes and Astler-Coller staging systems often combine different AJCC stage groupings and are not as precise.
|IIIC||C||C1, C2, C3|
If you have any questions about your stage, please ask your doctor to explain the extent of your disease.
Five-year relative survival for colon cancer by AJCC stage*: These numbers reflect the percent of people who are alive 5 years or more after being diagnosed with colon cancer, depending on their stage of disease at diagnosis. Importantly, these rates are derived from people who have had colorectal cancer in the past; improvements in treatment may result in a better outlook for more recently diagnosed patients.
See below for definition of 5-year relative survival. The survival for rectal cancer, stage for stage, is about the same.** Stage I 93% Stage IIA 85% Stage IIB 72% Stage IIIA 83% Stage IIIB 64% Stage IIIC 44% Stage IV 8%
*JNCI 2004;96:1420 (See complete citation in the "References" section of this document.) **NCDB Commission on Cancer
The 5-year survival rate refers to the percentage of patients who live at least 5 years after their cancer is diagnosed. Many of these patients live much longer than 5 years after diagnosis. But the 5-year survival rate is a standard way of discussing prognosis. Five-year relative survival rates don’t include patients dying of other diseases. Five-year relative survival rates are considered to be a more accurate way to describe the prognosis for patients with a particular type and stage of cancer. Of course, 5-year rates are based on patients diagnosed and initially treated more than 5 years ago.
These rates may no longer be accurate because improvements in treatment may result in a better outlook for recently diagnosed patients.
Five-year relative survival for patients with rectal cancer by AJCC stage treated 1990- 1999*. (These stages are slightly different from those above, which come from the third edition, 1988):
|Stage I 92%||Stage II 73%||Stage III 56%||Stage IV 8%|
*The Oncologist 2003;8:541 (See complete citation in the "References" section of this document.)
In an update that used patients from 1991-1993 that were stage III and divided them according to the staging above (6th Edition) into stage IIIa, IIIb, IIIc these results were obtained for relative 5-year survival:
|Stage IIIA 67%||Stage IIIB 44%||Stage IIIC 30%|
Another factor that contributes to the outlook for survival is the grade of the cancer. Grade is a description of how closely the cancer resembles normal colorectal tissue. Low grade means the tissue closely resembles normal tissue and high grade means the tissue appears most unlike normal tissue. Most of the time, high-grade cancers are associated with a poorer outcome than low-grade cancers. Doctors sometimes use this distinction to decide whether a patient should get extra treatment with chemotherapy after surgery (see adjuvant treatment below).
How Is Colorectal Cancer Treated?
This information represents the views of the doctors and nurses serving on the American Cancer Society’s Cancer Information Database Editorial Board. These views are based on their interpretation of studies published in medical journals, as well as their own professional experience.
The treatment information in this document is not official policy of the Society and is not intended as medical advice to replace the expertise and judgment of your cancer care team. It is intended to help you and your family make informed decisions, together with your doctor.
Your doctor may have reasons for suggesting a treatment plan different from these general treatment options. Don’t hesitate to ask him or her questions about your treatment options.
The following information is a summary of the types of treatments available to people with colon and rectal cancers. The usual treatments for colorectal cancers at each stage are then discussed.
The 4 main types of treatment for colon cancer and rectal cancer are surgery, radiation therapy, chemotherapy, and targeted therapies called monoclonal antibodies. Depending on
the stage of the cancer, 2 or more of these types of treatment may be combined at the same time or used after one another.
After the cancer has been found and staged, your doctor will recommend one or more treatment options. It is important to take time and think about all of the choices. You may want to ask for a second opinion. This can provide more information and help you feel more confident about the treatment plan you choose. It is also important to know that your chances for having the best possible outcome are highest in the hands of a medical team that is experienced in treating colorectal cancer.
Colon surgery: Surgery is the main treatment for colon cancer. The most commonly performed operation is called a segmental resection. To prepare for this surgery, you will be given a bowel preparation which may consist of laxatives and enemas. Just before the surgery, you will be given general anesthesia, which puts you into a deep sleep. During the surgery, your surgeon will make an incision in your abdomen. Then he or she will remove the cancer and a length of normal colon on either side of your cancer, as well as the nearby lymph nodes. Usually, about one fourth to one third of your colon is removed, but more or less tissue may be removed depending on the exact size and location of your cancer. The remaining sections of your colon are then reattached. Most experts feel that removing as many nearby lymph nodes as possible is important. Removing between 12 and 15 lymph nodes is considered adequate. When you wake up, you will have some pain and will need to be given pain medications for 2 or 3 days.
For the first couple of days, you will be given IV fluids and will not be able to eat. But a colon resection rarely causes any major problems with digestive functions and you should be able to eat in a few days. If the tumor is large and has blocked your colon, it may be possible to put in a stent through a colonoscope to relieve the blockage and prepare for surgery in a few days. However, if a stent cannot be placed or if the tumor has caused a hole in the colon, a temporary colostomy may be needed. A colostomy is made when the end of the colon is brought through an opening in the abdomen to the outside for the purpose of getting rid of body wastes. A pouch is then used to hold that waste. Rarely, if a tumor can’t be removed or a stent placed, a permanent colostomy is needed.
It is possible to remove some early colon cancers (stage 0 and some stage I tumors), or cancerous polyps, by surgery through a colonoscope. When this is done, the surgeon does not have to cut into the abdomen. This is called a polypectomy. The cancer is cut out across the base of the polyp’s stalk, the area that resembles the stem of a mushroom. Local excision removes superficial cancers and a small amount of nearby tissue.
It is sometimes possible to remove segments of the colon and nearby lymph nodes through a laparoscope. This is sometimes called laparoscopic or keyhole surgery. Using a cannula (a narrow tube-like instrument), the surgeon enters the abdomen. A laparoscope (a tiny telescope connected to a video camera) is inserted through the cannula, giving the surgeon a magnified view of the internal organs, which is displayed on a television monitor. Several other cannulas are inserted to allow the surgeon to work inside and remove part of the colon. These incisions are usually small and heal quickly. Although using laparoscopic surgery to remove colon cancers was once considered experimental, this is no longer true. A recent study has shown that laparoscopic surgery is as likely to be curative as the standard approach and patients may recover slightly faster and feel better than they do after conventional colon surgery. But the surgery requires more expertise than the standard approach and requires a skilled surgeon who has done a lot of these operations.
Rectal surgery: Surgery is usually the main treatment for rectal cancer, although radiation and chemotherapy will often be given before surgery, although some doctors prefer to give these after surgery. Several surgical methods are used for removing or destroying rectal cancers.
Polypectomy and local excision can be used to remove superficial cancers or polyps. Local transanal resection involves cutting through all layers of the rectum to remove invasive cancers as well as some surrounding normal rectal tissue. Polypectomy, local excision, and local transanal resection are done with instruments inserted through the anus, without making a surgical opening in the skin of the abdomen. This procedure can be used to remove some stage I rectal cancers that are relatively small and not too far from the anus.
Some stage I rectal cancers and most stage II or III rectal cancers are removed by either low anterior resection or abdominoperineal (AP) resection. Low anterior resection is used for cancers in the upper two thirds of your rectum, close to where it connects with the colon. In this procedure the tumor can be removed without affecting the anus. After low anterior resection, your colon will be attached to the anus and your waste will be eliminated in the usual way.
A low anterior resection is like most abdominal operations. You will take laxatives and enemas before surgery. Just before surgery, you will be given general anesthesia, which puts you into a deep sleep. The surgeon makes the incision only in the abdomen. Then the surgeon removes the cancer along with a margin of normal tissue on either side of the cancer. In addition, the surgeon will also remove lymph nodes and a large amount of fatty and fibrous tissue around the rectum. Then the colon can be reattached to the rectum that is remaining so that a permanent colostomy is not necessary. Sometimes, the entire rectum may be removed and the colon attached to the anus. This procedure is called a colo-anal anastomosis (anastomosis means connection). This is a more difficult procedure to do, but modern techniques have made it possible. Sometimes when a colo-anal anastomosis is done, a small pouch is made by doubling back a short segment of colon (colonic J-pouch) or by enlarging a segment (coloplasty). This allows for a small reservoir of colon – like the rectum. When special techniques are necessary to prevent a permanent colostomy, you may need to have a temporary colostomy opening for about 8 weeks while the surgical site heals. A second operation is then performed to close the temporary colostomy opening.
If the cancer is in the distal third of the rectum (the part nearest to the anus) and especially if it is growing into the sphincter muscle (the muscle that keeps the anus closed and prevents stool leakage), the anus and sphincter muscle may also need to be removed. Then an operation called an abdominoperineal resection is necessary. Here, not only does the surgeon make an incision in the abdomen, he or she must also make an incision in the perineal area around the anus. This incision allows the surgeon to remove the anus and the tissues surrounding it including the sphincter muscle. Having this procedure also means you will need a permanent colostomy to eliminate stool.
The usual hospital stay for either of these procedures is 4 to 7 days depending on your overall health. Recovery time at home may be 3 to 6 weeks. If you have had a colostomy, you will need help in learning how to manage it. Specially trained ostomy nurses or enterostomal therapists can do this. They will usually see you in the hospital before your operation to mark a site for the colostomy opening, and later can come to your house or an outpatient setting to provide you with more training.
If the rectal cancer is growing into nearby organs, a pelvic exenteration may be recommended. This is an extensive operation. Not only will the surgeon remove the rectum, but also nearby organs such as the bladder, prostate, or uterus if the cancer has spread to these organs. You will need a colostomy after pelvic exenteration. If the bladder is removed, you will also need a urostomy (opening where urine exits the front of the abdomen and is held in a portable pouch).
Side effects of surgery: Potential side effects of surgery include bleeding from the surgery, blood clots in the legs, and damage to nearby organs during the operation. Rarely, the connections between the ends of the intestine may not hold together completely and leak. If an infection occurs, it is possible that the incision might open up, causing an open wound. Later, after the surgery, you might develop what are called adhesions that could cause the bowel to become blocked.
Sexual impact of colorectal surgery: If you are a man, an abdominal perineal resection can cause you to have "dry" orgasms by damaging the nerves that control ejaculation. Sometimes the surgery only causes retrograde ejaculation, which means the semen goes backward into the bladder. The difference between no emission at all and retrograde ejaculation becomes important if you want to father a child. Retrograde ejaculation is less serious, because infertility specialists can recover sperm cells from the urine and these cells can be used to make a woman pregnant. If sperm cells cannot be recovered from your semen or urine, infertility specialists may be able to retrieve them directly from the testicle by minor surgery, and then use them for in vitro fertilization to produce a pregnancy. In some situations, AP resection may stop your erections or ability to reach orgasm. In other cases, your pleasure at orgasm may become less intense. Normal aging may cause some of these changes, but they may be made worse by the surgery.
If you are a woman having a colostomy, you should not normally expect any loss of sexual function. No matter what your gender, more information on dealing with the sexual impact of cancer and its treatment is available in the American Cancer Society documents, Sexuality and Cancer: For the Man Who Has Cancer and His Partner and Sexuality and Cancer: For the Woman Who Has Cancer and Her Partner.
Surgical treatment of colorectal cancer metastases: Sometimes, treatment of cancer that has metastasized, or spread to other organs, can help you to live longer — or to be cured. If only a small number of metastases are present in the liver, lungs, or ovaries, they may be removed by surgery. If only a few liver metastases are present, completely removing them along with the colorectal tumor may cure the cancer. Liver metastases may also be destroyed by freezing them (cryosurgery), by heating them with microwaves, by injecting material into large blood vessels feeding the tumor to block blood flow (embolization), or by injecting concentrated alcohol into the tumor. These methods do not require a surgical operation. The freezing probe, microwave probe, or needle is inserted through the skin and guided to the tumor by CT scans or ultrasound images. However, these methods are not curative.
Radiation therapy uses high-energy rays that destroy cancer cells. After surgery for rectal cancer, radiation can kill small deposits of cancer that may not be seen during surgery. If a rectal cancer’s size and/or position make surgery difficult, radiation may be used before surgery to shrink the tumor. Radiation also may be used to ease (palliate) symptoms if you have advanced cancer causing intestinal blockage, bleeding, or pain. Chemotherapy can make radiation therapy more effective against some colon and rectal cancers, and these 2 treatments are often used together.
The main use for radiation therapy in people with colon cancer is when the cancer has attached to an internal organ or the lining of the abdomen. When this occurs, the surgeon cannot be certain that all the cancer has been removed, and radiation therapy is used to kill the cancer cells remaining after surgery. For rectal cancer, radiation therapy is usually given to prevent the cancer from coming back in the pelvis where the tumor started. It may be given either before or after surgery, but recently doctors have begun to favor preoperative treatment, along with chemotherapy with a continuous infusion of 5-FU. Radiation therapy is given to treat local recurrences in rectal cancers that are causing symptoms such as pain. Radiation therapy is seldom used to treat metastatic colon cancer because of side effects and relative resistance when given at the lower tolerated doses.
External-beam radiation therapy focuses radiation on the cancer from a machine outside the body called a linear accelerator. This is the type of radiation therapy most often recommended for people with colon cancer. Treatments are given 5 days a week for several weeks. Each treatment lasts only a few minutes and is similar to having a diagnostic x-ray test. As with a diagnostic x-ray, the radiation passes through the skin and other tissues before it reaches the tumor. The actual radiation exposure is very quick, and most of the time is spent precisely positioning the patient so that the radiation is aimed accurately at the cancer.
Endocavitary radiation therapy, as with external-beam radiation therapy, is delivered from a radiation source outside the body. It is a hand-held device that is placed into the anus. The device delivers high-intensity radiation over a few minutes. This is repeated about 3 more times at about 2-week intervals for the full dose. The advantage is that the radiation is aimed through the anus and reaches the rectum without passing through the skin and other tissues of the abdomen. This can allow some patients, particularly elderly persons, to avoid radical surgery and colostomy. It is used only for small tumors. Sometimes external-beam therapy is also given.
Brachytherapy (internal radiation therapy) uses small pellets of radioactive material placed next to or directly into the cancer. Internal radiation is sometimes used in treating people with rectal cancer, particularly sick or elderly people who would not be able to tolerate curative surgery. This is generally a one-time only procedure and doesn’t require daily visits for several weeks.
Side effects of radiation therapy: Potential side effects of radiation therapy for colon and rectal cancer include mild skin irritation, nausea, diarrhea, rectal irritation, bladder irritation, bowel incontinence, fatigue, or sexual problems (impotence in men and vaginal irritation in women). Most of these will lessen after treatments are completed. The sexual problems and rectal and bladder irritation can persist. Some degree of rectal and/or bladder irritation may be a permanent side effect. This can lead to diarrhea, bleeding, and frequent urination. If you begin to develop these or other side effects, talk to your doctor right away so steps can be taken to reduce or relieve them.Chemotherapy
Use of chemotherapy after surgery can increase the survival rate for patients with some stages of colon cancer and rectal cancer. This is called adjuvant (additional) chemotherapy. It is given when there is no evidence of cancer but there is a chance that it might come back. The theory behind adjuvant therapy is that a small number of cancer cells may have escaped from the primary tumor and settled in other parts of the body, and the chemotherapy can eliminate these. Chemotherapy can also help shrink tumors and relieve symptoms of advanced cancer.
Systemic chemotherapy uses cancer-fighting drugs that are injected into a vein or given by mouth. These drugs enter the bloodstream and reach all areas of the body. This treatment is useful for cancers that have metastasized (spread) beyond the organ they started in. In regional chemotherapy, drugs are injected directly into an artery leading to a part of the body containing a tumor. This approach concentrates the dose of chemotherapy reaching the cancer cells. It reduces side effects by limiting the amount reaching the rest of the body. Hepatic artery infusion is an example of regional chemotherapy sometimes used for colon cancer that has spread to the liver. Here, chemotherapy is given directly into an artery leading to the liver.
Fluorouracil (5-FU) is the drug most often used to treat colon cancer. In adjuvant therapy, it is often given together with another drug, leucovorin, which increases its effectiveness. In the past, 5-FU was usually injected slowly into a vein over about 5 minutes and then followed by the leucovorin. These injections were given daily for 5 days, followed by 3 weeks off chemotherapy or weekly for 6 weeks, followed by 2 weeks off treatment.
Recently it has been found that a different way of giving these drugs may be better. In this regimen, called the de Gramont regimen, the 5-FU is given continuously over 2 days as well as by rapid injection on the first day. The leucovorin is given on the first and second day over 2 hours. This regimen is given every other week.
In all of these schedules, alternating periods of treatment and recovery are repeated over a period of 6 months to 1 year. In some regimens the 5-FU is given continuously and patients wear a small battery-operated pump that continuously infuses 5-FU into an intravenous catheter. Leucovorin and 5-FU are also used for palliative treatment to control the growth of the cancer or relieve symptoms. Generally, 5-FU/leucovorin is given for 6 months.
Capecitabine (Xeloda) is a chemotherapy drug, taken by mouth, that is changed to 5-FU once it gets to the tumor site. This drug can be used instead of intravenous 5-FU and acts as if the 5-FU were being given continuously. The possible side effects of this drug are nausea, diarrhea, and a syndrome of hand and foot redness that is sometimes accompanied by skin peeling. Many oncologists (a doctor with special training in the diagnosis and treatment of cancer) will use capecitabine instead of a continuous infusion of 5-FU.
Irinotecan (Camptosar) is often used to help control colorectal cancer. It formerly was used in patients no longer responding to palliative 5-FU therapy. But it has been found that irinotecan combined with 5-FU and leucovorin is more effective than 5-FU and leucovorin alone as the first treatment in people with metastatic colorectal cancer, so it is now often used as the first treatment in this situation. One problem with irinotecan is that some people are unable to break down the drug so it stays in the body and causes severe toxicity. This is due to an inherited genetic variation that can be tested for. The simplest test is to measure the blood level of bilirubin, a substance made in the liver. If it is slightly elevated, this can be a sign of the genetic variation that makes people sensitive to irinotecan. So far, most doctors aren’t routinely testing for the genetic variant itself.
The major toxicity of irinotecan is severe diarrhea and low blood counts. You need to tell your doctor right away if you develop diarrhea or any other side effects. Your doctors may not recommend irinotecan if you are elderly or have other serious health problems. If these severe side effects are uncontrolled, they may lead to death.
These side effects are not as much a problem in patients who do well with the first treatment. If you are already on this combination and have not had any major problems, you may not develop them.
Oxaliplatin (Eloxatin) is another drug recently approved by the FDA for use in colorectal cancer. Oxaliplatin is very effective when combined with 5-FU and leucovorin (LV). The major side effect of oxaliplatin is that it causes numbness and tingling — and extreme sensitivity to temperature — in various parts of the body, mostly arms and legs. This can last for months but almost always goes away in most patients. But about 12 % of patients who receive this drug as adjuvant therapy will have long-lasting nerve damage. Just recently, a new drug was found to reduce the numbness and tingling associated with oxaliplatin. If you are taking oxaliplatin, talk with your doctor about side effects beforehand, and let him or her know as soon as you develop numbness and tingling, or other side effects
Patients with more advanced cancers, which include some with stage II and all with stage III, have a higher chance that the cancer will return, often at a distant site. Many clinical trials have tested different combinations of drugs to prevent this recurrence. The most effective adjuvant treatment seems to be a chemotherapy combination called FOLFOX (Folinic acid, 5-FU, Oxaliplatin). This is a combination of 5-FU and leucovorin (also called folinic acid) given by the de Gramont method along with oxaliplatin. Another regimen gives the 5-FU and leucovorin weekly by rapid intravenous infusion along with the oxaliplatin. Although this may be as effective as FOLFOX, it appears to cause more side effects, mainly severe diarrhea. Other regimens that may be used are combinations of 5-FU and leucovorin.
Side effects of chemotherapy: Chemotherapy drugs kill cancer cells but also damage some normal cells. Your doctor and other health providers can help to avoid or minimize side effects, which will depend on the type of drugs, the amount taken, and the length of your treatment. You might temporarily experience nausea and vomiting, loss of appetite, loss of hair, hand and foot swelling and rashes, and mouth sores. Diarrhea can be troubling, especially if you are receiving irinotecan, but it can also occur with 5-FU/leucovorin treatment. Nerve damage from oxaliplatin can also be troubling, but usually disappears in a few months.
Because chemotherapy can damage the blood-producing cells of the bone marrow, you may develop low blood cell counts. This can result in an increased chance of infection (due to a shortage of white blood cells), bleeding or bruising after minor cuts or injuries (due to a shortage of blood platelets), and fatigue (due to low red blood cell counts).
Most side effects disappear once treatment is stopped. Your hair will grow back after treatment ends, though it may look different. There are remedies for many of the temporary side effects of chemotherapy — for example, anti-emetic drugs that can prevent or reduce nausea and vomiting.
Elderly people seem to be able to tolerate chemotherapy for colorectal cancer. There is no reason to withhold treatment in otherwise healthy people because of age.
If you experience side effects from treatment, please tell your healthcare team right away, so that they can help to reduce these effects.
Targeted therapies are those that specifically attack some part of cancer cells that make them different from normal cells. Because of this, they should cause fewer side effects than chemotherapy drugs.
Cetuximab (Erbitux) was the first targeted therapy approved for treating colorectal cancer. It is a manmade protein called a monoclonal antibody that specifically attacks the epidermal growth factor receptor (EGFR), a molecule that often appears in high amounts on the surface of cancer cells.
The FDA has approved cetuximab for use with irinotecan or without irinotecan in those who can’t take irinotecan or whose cancer is no longer responding to it. In about 10% of patients whose cancers continue to grow despite other treatments, cetuximab will cause tumor shrinkage. This figure is doubled when cetuximab is combined with irinotecan, even if the patients have already been treated with irinotecan and are no longer responding.
Cetuximab is given by intravenous injection. The most serious side effect of cetuximab is an allergic reaction during the first infusion, which could cause problems with breathing and low blood pressure. Other less serious side effects may include an acne-like rash, dry skin, tiredness, fever, and constipation.
Panitumumab (Vectibix) is another monoclonal antibody that attacks colorectal cancer cells. It works like cetuximab. In the biggest clinical trial of this drug, the tumors shrank in about 8% of people who were not responding to other treatments. The most serious toxicities are lung scarring, severe skin reactions that sometimes become infected, and allergic reactions to the drug.
Bevacizumab (Avastin), another monoclonal antibody, is approved for first-line use against metastatic colorectal cancer. It is used along with chemotherapy drugs. This antibody is directed against vascular endothelial growth factor (VEGF), a protein that helps tumors form new blood vessels to get nutrients (a process known as angiogenesis). In one study, when bevacizumab was given along with an irinotecan-containing chemotherapy regimen, it increased the shrinkage rate in tumors by 30% compared to patients who were given the same chemotherapy without bevacizumab. It also nearly doubled the time it took for the tumors to grow back. Bevacizumab is the first anti-angiogenesis drug approved to treat colorectal cancer. It is given by intravenous infusion.
Rare but possibly serious side effects include bleeding, holes forming in the colon (requiring surgery to correct), and slow wound healing. More common side effects include high blood pressure, tiredness, blood clots, bleeding, low white blood cell counts, headaches, mouth sores, loss of appetite, and diarrhea.
Clinical trials are in progress to study different combinations of chemotherapy agents and targeted therapies.
Cost of Drugs
Some of the cancer drugs described are very expensive. 5-FU and leucovorin are inexpensive, but 8 weeks of treatment with a combination that includes oxaliplatin or irinotecan and one of the targeted therapies will cost at least $20,000 to $30,000.
You have had to make a lot of decisions since you’ve been told you have cancer. One of the most important decisions you will make is deciding which treatment is best for you. You may have heard about clinical trials being done for your type of cancer. Or maybe someone on your health care team has mentioned a clinical trial to you. Clinical trials are one way to get state-of-the art cancer care. Still, they are not right for everyone.
Here we will give you a brief review of clinical trials. Talking to your health care team, your family, and your friends can help you make the best treatment choice for you.
What Are Clinical Trials?
Clinical trials are carefully controlled research studies that are done with patients. These studies test whether a new treatment is safe and how well it works in patients, or they may test new ways to diagnose or prevent a disease. Clinical trials have led to many advances in cancer prevention, diagnosis, and treatment.
The Purpose of Clinical Trials
Clinical trials are done to get a closer look at promising new treatments or procedures in patients. A clinical trial is only done when there is good reason to believe that the treatment, test, or procedure being studied may be better than the one used now. Treatments used in clinical trials are often found to have real benefits and may go on to become tomorrow’s standard treatment.
Clinical trials can focus on many things, such as:
- new uses of drugs that are already approved by the US Food and Drug Administration (FDA)
- new drugs that have not yet been approved by the FDA
- non-drug treatments (such as radiation therapy)
- medical procedures (such as types of surgery)
- herbs and vitamins
- tools to improve the ways medicines or diagnostic tests are used
- medicines or procedures to relieve symptoms or improve comfort
- combinations of treatments and procedures
Researchers conduct studies of new treatments to try to answer the following questions:
- Is the treatment helpful?
- What’s the best way to give it?
- Does it work better than other treatments already available?
- What side effects does the treatment cause?
- Are there more or fewer side effects than the standard treatment used now?
- Do the benefits outweigh the side effects?
- In which patients is the treatment most likely to be helpful?
Phases of Clinical Trials
There are 4 phases of clinical trials, which are numbered I, II, III, and IV. We will use the example of testing a new cancer treatment drug to look at what each phase is like.
Phase I clinical trials: The purpose of a phase I study is to find the best way to give a new treatment safely to patients. The cancer care team closely watches patients for any harmful side effects.
For phase I studies, the drug has already been tested in lab and animal studies, but the side effects in patients are not fully known. Doctors start by giving very low doses of the drug to the first patients and increase the doses for later groups of patients until side effects appear or the desired effect is seen. Doctors are hoping to help patients, but the main purpose of a phase I trial is to test the safety of the drug.
Phase I clinical trials are often done in small groups of people with different cancers that have not responded to standard treatment, or that keep coming back (recurring) after treatment. If a drug is found to be reasonably safe in phase I studies, it can be tested in a phase II clinical trial.
Phase II clinical trials: These studies are designed to see if the drug works. Patients are given the best dose as determined from phase I studies. They are closely watched for an effect on the cancer. The cancer care team also looks for side effects.
Phase II trials are often done in larger groups of patients with a specific cancer type that has not responded to standard treatment. If a drug is found to be effective in phase II studies, it can be tested in a phase III clinical trial.
Phase III clinical trials: Phase III studies involve large numbers of patients — most often those who have just been diagnosed with a specific type of cancer. Phase III clinical trials may enroll thousands of patients.
Often, these studies are randomized. This means that patients are randomly put in one of two (or more) groups. One group (called the control group) gets the standard, most accepted treatment. Other group(s) get the new one(s) being studied. All patients in phase III studies are closely watched. The study will be stopped early if the side effects of the new treatment are too severe or if one group has much better results than the others.
Phase III clinical trials are usually needed before the FDA will approve a treatment for use by the general public.
Phase IV clinical trials: Once a drug has been approved by the FDA and is available for all patients, it is still studied in other clinical trials (sometimes referred to as phase IV studies). This way more can be learned about short-term and long-term side effects and safety as the drug is used in larger numbers of patients with many types of diseases. Doctors can also learn more about how well the drug works, and if it might be helpful when used in other ways (such as in combination with other treatments).
What It Will Be Like to Be in a Clinical Trial
If you are in a clinical trial, you will have a team of experts taking care of you and watching your progress very carefully. Depending on the phase of the clinical trial, you may receive more attention (such as having more doctor visits and lab tests) than you would if you were treated outside of a clinical trial. Clinical trials are specially designed to pay close attention to you.
However, there are some risks. No one involved in the study knows in advance whether the treatment will work or exactly what side effects will occur. That is what the study is designed to find out. While most side effects go away in time, some may be long-lasting or even life threatening. Keep in mind, though, that even standard treatments have side effects. Depending on many factors, you may decide to enter (enroll in) a clinical trial.
Deciding to Enter a Clinical Trial
If you would like to take part in a clinical trial, you should begin by asking your doctor if your clinic or hospital conducts clinical trials. There are requirements you must meet to take part in any clinical trial. But whether or not you enter (enroll in) a clinical trial is completely up to you.
Your doctors and nurses will explain the study to you in detail. They will go over the possible risks and benefits and give you a form to read and sign. The form says that you understand the clinical trial and want to take part in it. This process is known as giving your informed consent. Even after reading and signing the form and after the clinical trial begins, you are free to leave the study at any time, for any reason. Taking part in a clinical trial does not keep you from getting any other medical care you may need.
To find out more about clinical trials, talk to your cancer care team. Here are some questions you might ask:
- Is there a clinical trial that I could take part in?
- What is the purpose of the study?
- What kinds of tests and treatments does the study involve?
- What does this treatment do? Has it been used before?
- Will I know which treatment I receive?
- What is likely to happen in my case with, or without, this new treatment?
- What are my other choices and their pros and cons?
- How could the study affect my daily life?
- What side effects can I expect from the study? Can the side effects be controlled?
- Will I have to stay in the hospital? If so, how often and for how long?
- Will the study cost me anything? Will any of the treatment be free?
- If I am harmed as a result of the research, what treatment would I be entitled to?
- What type of long-term follow-up care is part of the study?
- Has the treatment been used to treat other types of cancers?
How Can I Find Out More About Clinical Trials That Might Be Right for Me?
The American Cancer Society offers a clinical trials matching service for patients, their family, and friends. You can reach this service at 1-800-303-5691 or on our Web site at http://clinicaltrials.cancer.org.
Based on the information you give about your cancer type, stage, and previous treatments, this service can put together a list of clinical trials that match your medical needs. The service will also ask where you live and whether you are willing to travel so that it can look for a treatment center that you can get to.
You can also get a list of current clinical trials by calling the National Cancer Institute’s Cancer Information Service toll free at 1-800-4-CANCER (1-800-422-6237) or by visiting the NCI clinical trials Web site at www.cancer.gov/clinicaltrials.
For even more information on clinical trials, the American Cancer Society has a document called Clinical Trials: What You Need to Know. You can read this on the Web site, www.cancer.org, or have it sent to you by calling 1-800-ACS-2345.
Complementary and Alternative Therapies
When you have cancer you are likely to hear about ways to treat your cancer or relieve symptoms that are different from mainstream (standard) medical treatment. These methods can include vitamins, herbs, and special diets, or methods such as acupuncture or massage— among many others. You may have a lot of questions about these treatments. Here are some you may have thought of already:
- How do I know if a non-standard treatment is safe?
- How do I know if it works?
- Should I try one or more of these treatments?
- What does my doctor know/think about these methods? Should I tell the doctor that I’m thinking about trying them?
- Will these treatments cause a problem with my standard medical treatment?
- What is the difference between "complementary" and "alternative" methods?
- Where can I find out more about these treatments?
The Terms Can Be Confusing
Not everyone uses these terms the same way, so it can be confusing. The American Cancer Society uses complementary to refer to medicines or methods that are used along with your regular medical care. Alternative medicine is a treatment used instead of standard medical treatment.
Complementary Methods: Complementary treatment methods, for the most part, are not presented as cures for cancer. Most often they are used to help you feel better. Some methods that can be used in a complementary way are meditation to reduce stress, acupuncture to relieve pain or peppermint tea to relieve nausea. There are many others. Some of these methods are known to help, while others have not been tested. Some have been proven not be helpful. A few have even been found harmful. However, some of these methods may add to your comfort and well-being.
There are many complementary methods that you can safely use right along with your medical treatment to help relieve symptoms or side effects, to ease pain, and to help you enjoy life more. For example, some people find methods such as aromatherapy, massage therapy, meditation, or yoga to be useful.
Alternative Treatments: Alternative treatments are those that are used instead of standard medical care. These treatments have not been proven safe and effective in clinical trials. Some of these methods may even be dangerous and some have life-threatening side effects. The biggest danger in most cases is that you may lose the chance to benefit from standard treatment. Delays or interruptions in your standard medical treatment may give the cancer more time to grow.Deciding What to Do
It is easy to see why people with cancer may consider alternative methods. You want to do all you can to fight the cancer. Sometimes mainstream treatments such as chemotherapy can be hard to take, or they may no longer be working.
Sometimes people suggest that their method can cure your cancer without having serious side effects, and it’s normal to want to believe them. But the truth is that most non-standard methods of treatment have not been tested and proven to be effective for treating cancer.
As you consider your options, here are 3 important steps you can take:
- Talk to your doctor or nurse about any method you are thinking about using.
- Check the list of "red flags" below.
- Contact the American Cancer Society at 1-800-ACS-2345 to learn more about complementary and alternative methods in general and to learn more about the specific methods you are thinking about.
You can use the questions below to spot treatments or methods to avoid. A "yes" answer to any one of these questions should raise a "red flag."
- Does the treatment promise a cure for all or most cancers?
- Are you told not to use standard medical treatment?
- Is the treatment or drug a "secret" that only certain people can give?
- Does the treatment require you to travel to another country?
- Do the promoters attack the medical or scientific community?
The Decision Is Yours
Decisions about how to treat or manage your cancer are always yours to make. If you are thinking about using a complementary or alternative method, be sure to learn about the method and talk to your doctor about it. With reliable information and the support of your health care team, you may be able to safely use the methods that can help you while avoiding those that could be harmful.
Treatment by Stage of Colon Cancer
For all but stage IV disease, surgery to remove the colon tumor is the primary or first treatment. Adjuvant therapy (additional treatments) may also be used. Most adjuvant treatment is given for about 6 months.
Stage 0: Since your cancer has not grown beyond the inner lining of the colon, surgery to take out the cancer is all that is needed. This may be accomplished in many cases by polypectomy or local excision through the colonoscope. Colon resection may be necessary if your tumor is too big to be removed by local excision.
Stage I: Your cancer has grown through several layers of the colon. But it has not spread outside the colon wall itself. Surgical resection to remove the cancer is the standard treatment. You do not need any additional therapy.
Stage II: Your cancer has grown through the wall of the colon and may extend into nearby tissue. It has not yet spread to the lymph nodes. Surgical resection is usually the only treatment you need. If your doctor thinks your cancer is likely to come back because of its appearance under the microscope or because it was growing into other tissues, radiation therapy or chemotherapy may be recommended. Radiation therapy can be given to the area of your abdomen where the cancer was growing. Chemotherapy is not standard treatment for this stage of colon cancer, but many doctors recommend it if the risk of recurrence seems high, such as in stage IIB disease. There are clinical trials studying this issue, and you might consider enrolling in one. If your doctor recommends chemotherapy, it may be the FOLFOX regimen, although some doctors may prefer other regimens, such as 5-FU and leucovorin or capecitabine, because they are better suited to your health needs. Some oncologists may recommend a combination of capecitabine and oxaliplatin.
Stage III: This stage of cancer has spread to nearby lymph nodes but it has not yet spread to other parts of the body. Surgical resection is the first treatment. You should then receive chemotherapy. It will likely be the FOLFOX regimen, although some doctors may prefer other regimens, such as 5-FU and leucovorin or capecitabine because they are better suited to your health needs. Some oncologists may recommend a combination of capecitabine and oxaliplatin. You may need radiation therapy if the cancer has grown into tissues adjacent to the colon and rectum.
Stage IV: The cancer has spread from the colon to distant organs and tissues such as the liver, lungs, peritoneum, or ovaries. The goal of surgery (segmental resection or diverting colostomy) in this stage is usually to relieve or prevent blockage of the colon and to prevent other local complications. In some patients with extensive spread of cancer (metasteses), such a blockage can be prevented or managed by inserting a tube through the tumor (a stent) during colonoscopy so that surgery can be avoided.
Surgery in stage IV disease is usually not done with the expectation of curing the colon cancer. However, if only a few small metastases (usually 5 or fewer) are present in the liver and can be completely removed along with the colon cancer, surgery can help you live longer and may even cure you. You may also be treated with chemotherapy and targeted therapies to control the cancer. Chemotherapy agents could be given directly into the arteries that lead into the liver. Another alternative would be intravenous chemotherapy with 5-FU and leucovorin with or without oxaliplatin, the FOLFOX regimen. Recently, doctors have found that adding bevacizumab (Avastin) to this regimen is more effective. Capecitabine pills or irinotecan combined with cetuximab are other alternatives.
If the metastases cannot be surgically removed because they are too large or there are too many of them, it may be possible to destroy the tumors by freezing, heating with microwaves, or other non-surgical methods. Chemotherapy or radiation therapy (or both) may be given to relieve, delay, or prevent symptoms.
Recurrent colon cancer: Recurrent cancer means that your cancer has returned after treatment. The recurrence may be local (near the area of the initial tumor) or it may affect distant organs. If the cancer comes back in a distant site, it is most likely to first come back in the liver. Surgery to remove local recurrences can sometimes help you live longer. As with stage IV colon cancer, surgery to remove metastases can also sometimes help you and, along with chemotherapy, can still be curative.
If the metastases can’t be removed, chemotherapy with FOLFOX or irinotecan with 5-FU and leucovorin are the main treatments. FOLFOX may be combined with bevacizumab and the irinotecan with cetuximab. Capecitabine or 5-FU and leucovorin are other options. Drugs are selected based on which, if any, chemotherapy drugs you received before the cancer came back and how long ago you received them. You also might want to discuss appropriate clinical trials with your doctor.
Treatment by Stage of Rectal Cancer
Except for some patients with stage IV cancer, surgery to remove the rectal cancer is the main treatment. Adjuvant therapy (additional treatments) with radiation and chemotherapy may also be used. Most adjuvant treatment is given for about 6 months.
Stage 0: At this stage the cancer has not grown beyond the inner lining of the rectum. Removing or destroying the cancer is all that is needed. You can be treated with a polypectomy, local excision, or full thickness rectal resection. You will need no further treatment.
Stage I: In this stage, the cancer has grown through the first layer of the rectum into deeper layers but has not spread outside the rectal wall itself. Primary surgery is usually either low anterior resection or abdominoperineal resection, depending on exactly where the cancer is found within the rectum. Some small stage I rectal cancers may be treated by removing them through the anus without an abdominal incision but many surgeons are now recommending more therapy with radiation and chemotherapy for some patients having such surgery.
If you are too sick to withstand surgery, you may be treated only with radiation therapy. Sometimes this is endocavitary radiation therapy (aiming radiation through the anus) or brachytherapy (placing radioactive pellets directly into the cancer). However, this has not been proven to be as effective as surgery.
Stage II: The cancer has grown through the wall of your rectum into nearby tissue. It has not yet spread to the lymph nodes. Stage II rectal cancers are usually treated by low anterior resection or abdominoperineal resection, along with both chemotherapy and radiation therapy. Radiation can be given either before or after your surgery. Most doctors now favor giving the radiation therapy along with chemotherapy before surgery. Also, many doctors now favor giving adjuvant chemotherapy after surgery. It may be the FOLFOX regimen, although some doctors may prefer other regimens, such as 5-FU and leucovorin or capecitabine, because they are better suited to your health needs. Some oncologists may recommend a combination of capecitabine and oxaliplatin.
In some cases of stage II rectal cancer, transanal full thickness rectal resection can be done after chemotherapy and radiation therapy. This approach can prevent the need for abdominoperineal resection and colostomy in some cases. A problem with this is there is no way of knowing whether the cancer has spread to your lymph nodes or being sure the cancer hasn’t spread further in your pelvis. For this reason, the procedure isn’t generally recommended.
Stage III: The cancer has spread to nearby lymph nodes but not to other parts of your body. The rectal tumor is usually removed by low anterior resection or abdominoperineal resection. Radiation therapy will be given before or after surgery. As in stage II, many doctors now prefer to give the radiation therapy along with chemotherapy before surgery because it lowers the chance that the cancer will come back in the pelvis. It will also be used for large tumors to make the surgery more effective.
You should then receive chemotherapy. The FOLFOX regimen is the one that many experts recommend. Alternatives are 5-FU and leucovorin or capecitabine, which may better suit the health needs of some patients. Some oncologists may recommend a combination of capecitabine with oxaliplatin.
Stage IV: The cancer has spread to distant organs and tissues such as the liver or lungs. The goal of surgery in this stage is to relieve or prevent blockage of the rectum by the cancer and to prevent local complications such as bleeding. Sometimes inserting a tube through the cancer (a stent) during colonoscopy can open the blockage. The cancer usually cannot be cured by rectal surgery because it has spread. However, in some cases, it may be possible to remove the rectal tumor, as well as the metastases if only a few are present.
This surgery can help you live longer and/or relieve some of your symptoms. If only a few liver metastases are present, completely removing them along with the rectal tumor may cure you. If metastases cannot be removed by surgery because they are too large or there are too many of them, it may be possible to destroy the tumors by freezing (cryosurgery), heating with microwaves, photocoagulation (vaporizing the tumor with a laser), or other non-surgical methods. You may also receive chemotherapy or radiation therapy (or both) to control the cancer and to relieve, delay, or prevent symptoms.
It is usually important to treat the rectal tumor with either surgery or radiation therapy, perhaps combined with chemotherapy to prevent blocking of the rectum and/or spread into surrounding tissues. If it appears that the cancer can’t be removed or shrunk, then a colostomy will be done to get around any rectal blockage.
If you have only liver metastases, you may be treated with chemotherapy given directly into the artery leading to the liver. This shrinks the cancers in the liver more effectively than if the chemotherapy is given intravenously. If there are only a few liver metastases, removing them with surgery may prolong life and even be curative.
Recurrent rectal cancer: Recurrent cancer means that the cancer has returned after treatment. It may come back locally (near the area of the initial rectal tumor) or in distant organs. Surgery to remove local recurrences can help you live longer. If the tumor cannot be completely removed, combined chemotherapy and radiation therapy may be used. Sometimes, this combination shrinks the cancer enough that complete surgical removal is then possible. If the cancer comes back in a distant site, it is most likely to first come back in the liver. If there are only a few metastases (usually less than 5), these may be treated with surgery followed by chemotherapy. Other sites of recurrence are the lung and bones. Most recurrences develop in the first 2 to 3 years after surgery. If the metastases can’t be removed, chemotherapy with FOLFOX or irinotecan along with 5- FU and leucovorin are the main treatments. The FOLFOX may be combined with bevacizumab and the irinotecan/FU/leucovorin with cetuximab. Capecitabine and 5-FU with leucovorin are other options.
Drugs are selected based on which, if any, chemotherapy drugs you received before the cancer came back and how long ago you received them along with your particular health needs. You also might want to discuss with your doctor whether you might enroll in a clinical trial.
The specific agents used are selected based on which, if any, you received before the cancer came back and how long ago you received them. You also might want to discuss appropriate clinical trials with your doctor.
More Treatment Information
For more details on treatment options — including some that may not be addressed in this document — the National Comprehensive Cancer Network (NCCN) and the National Cancer Institute (NCI) are good sources of information.
The NCCN, made up of experts from 19 of the nation’s leading cancer centers, develops cancer treatment guidelines for doctors to use when treating patients. Those are available on the NCCN Web site (www.nccn.org).
The American Cancer Society collaborates with the NCCN to produce a version of some of these treatment guidelines, written specifically for patients and their families. These lesstechnical versions are available on both the NCCN Web site (www.nccn.org) and the American Cancer Society Web site (www.cancer.org). A print version can also be requested from the American Cancer Society at 1-800-ACS-2345.
The NCI provides treatment guidelines via its telephone information center (1-800-4- CANCER) and its Web site (www.cancer.gov). Detailed guidelines intended for use by cancer care professionals are also available on www.cancer.gov.
What Should You Ask Your Doctor About Colorectal Cancer?
It is important to have frank, open discussions with your cancer care team. They want to answer all of your questions, so that you can make informed treatment and life decisions. For instance, consider these questions:
- Where is my cancer located?
- Has my cancer spread beyond the primary site?
- What is the stage of my cancer and what does that mean in my case?
- What treatment choices do I have?
- What do you recommend and why?
- What risks or side effects are there to the treatments you suggest? What are the chances my cancer will come back with these treatment plans?
- What should I do to be ready for treatment?
- What can I do to reduce the side effects of treatment?
- Should I follow a special diet?
In addition to these sample questions, be sure to write down some of your own. For instance, you might want more information about recovery times so you can plan your work schedule. Or you may want to ask about second opinions or about clinical trials for which you may qualify.
What Happens After Treatment for Colorectal Cancer?
Completing treatment can be both stressful and exciting. You will be relieved to finish treatment, yet it is hard not to worry about cancer coming back. (When cancer returns, it is called recurrence.) This is a very common concern among those who have had cancer.
It may take a while before your confidence in your own recovery begins to feel real and your fears are somewhat relieved. Even with no recurrences, people who have had cancer learn to live with uncertainty.
After your treatment is over, it is very important to keep all follow-up appointments. During these visits, your doctors will ask about symptoms, do physical exams, and order blood tests or imaging studies such as CT scans or x-rays. Follow-up is needed to check for cancer recurrence or spread, as well as possible side effects of certain treatments. This is the time for you to ask your health care team any questions you need answered and to discuss any concerns you might have. You should also have a repeat colonoscopy at one year after surgery. If this is normal, it should be repeated in 3 years. If that exam is normal, then you can wait 5 years for your next colonoscopy.
Almost any cancer treatment can have side effects. Some may last for a few weeks to several months, but others can be permanent. Don’t hesitate to tell your cancer care team about any symptoms or side effects that bother you so they can help you manage them.
It is also important to keep medical insurance. Even though no one wants to think of their cancer coming back, it is always a possibility. If it happens, the last thing you want is to have to worry about paying for treatment. Many people have been bankrupted by cancer recurrence.
Imaging: Because removing a few liver metastases may be curative, your doctor may want to pay special attention to examining your liver with frequent CT scans or PET scans, especially in the first 2 years after surgery.
Tumor markers: Carcinoembryonic antigen (CEA) and CA 19-9 are substances in the blood of some people with colorectal cancer. Tests for these substances are sometime useful if you have any symptoms that suggest the cancer has come back. Some doctors perform these tests routinely in order to detect recurrences before you have symptoms. Usually these are most important in the first 2 years after treatment, when most recurrences occur.
For patients with a colostomy: If you have a colostomy, you may feel worried or isolated from normal activities. Whether your colostomy is temporary or permanent, an enterostomal therapist (a health care professional trained to help people with their colostomies) can teach you about the care of your colostomy. You can ask the American Cancer Society about programs offering information and support in your area.
Seeing a New Doctor
At some point after your cancer diagnosis and treatment, you may find yourself in the office of a new doctor. Your original doctor may have moved or retired, or you may have moved or changed doctors for some reason. It is important that you be able to give your new doctor the exact details of your diagnosis and treatment. Make sure you have the following information handy:
- a copy of your pathology report from any biopsy or surgery
- CT scan and MRI images on a transportable DVD
- if you had surgery, a copy of your operative report
- if you were hospitalized, a copy of the discharge summary that every doctor must prepare when patients are sent home from the hospital
- finally, since some cancer treatment drugs can have long-term side effects, a list of your drugs, drug doses, and when you took them
Lifestyle Changes to Consider During and After Treatment
Having cancer and dealing with treatment can be time-consuming and emotionally draining, but it can also be a time to look at your life in new ways. Maybe you are thinking about how to improve your health over the long term. Some people even begin this process during cancer treatment.
Make Healthier Choices
Think about your life before you learned you had cancer. Were there things you did that might have made you less healthy? Maybe you drank too much alcohol, or ate more than you needed, or smoked, or didn’t exercise very often. Emotionally, maybe you kept your feelings bottled up, or maybe you let stressful situations go on too long.
Now is not the time to feel guilty or to blame yourself. However, you can start making changes today that can have positive effects for the rest of your life. Not only will you feel better but you will also be healthier. What better time than now to take advantage of the motivation you have as a result of going through a life-changing experience like having cancer?
You can start by working on those things that you feel most concerned about. Get help with those that are harder for you. For instance, if you are thinking about quitting smoking and need help, call the American Cancer Society’s Quitline® tobacco cessation program at 1-800- ACS-2345.
Diet and Nutrition
Eating right can be a challenge for anyone, but it can get even tougher during and after cancer treatment. For instance, treatment often may change your sense of taste. Nausea can be a problem. You may lose your appetite for a while and lose weight when you don’t want to. On the other hand, some people gain weight even without eating more. This can be frustrating, too.
If you are losing weight or have taste problems during treatment, do the best you can with eating and remember that these problems usually improve over time. You may want to ask your cancer team for a referral to a dietitian, an expert in nutrition who can give you ideas on how to fight some of the side effects of your treatment. You may also find it helps to eat small portions every 2 to 3 hours until you feel better and can go back to a more normal schedule.
One of the best things you can do after treatment is to put healthy eating habits into place. You will be surprised at the long-term benefits of some simple changes, like increasing the variety of healthy foods you eat. Try to eat 5 or more servings of vegetables and fruits each day. Choose whole grain foods instead of white flour and sugars. Try to limit meats that are high in fat. Cut back on processed meats like hot dogs, bologna, and bacon. Get rid of them altogether if you can. If you drink alcohol, limit yourself to 1 or 2 drinks a day at the most. And don’t forget to get some type of regular exercise. The combination of a good diet and regular exercise will help you maintain a healthy weight and keep you feeling more energetic.
Rest, Fatigue, Work, and Exercise
Fatigue is a very common symptom in people being treated for cancer. This is often not an ordinary type of tiredness but a “bone-weary” exhaustion that doesn’t get better with rest. For some, this fatigue lasts a long time after treatment, and can discourage them from physical activity.
However, exercise can actually help you reduce fatigue. Studies have shown that patients who follow an exercise program tailored to their personal needs feel physically and emotionally improved and can cope better.
If you are ill and need to be on bed rest during treatment, it is normal to expect your fitness, endurance, and muscle strength to decline some. Physical therapy can help you maintain strength and range of motion in your muscles, which can help fight fatigue and the sense of depression that sometimes comes with feeling so tired.
Any program of physical activity should fit your own situation. An older person who has never exercised will not be able to take on the same amount of exercise as a 20-year-old who plays tennis 3 times a week. If you haven’t exercised in a few years but can still get around, you may want to think about taking short walks.
Talk with your health care team before starting, and get their opinion about your exercise plans. Then, try to get an exercise buddy so that you’re not doing it alone. Having family or friends involved when starting a new exercise program can give you that extra boost of support to keep you going when the push just isn’t there.
If you are very tired, though, you will need to balance activity with rest. It is okay to rest when you need to. It is really hard for some people to allow themselves to do that when they are used to working all day or taking care of a household. (For more information about fatigue, please see the publication, Cancer Related Fatigue and Anemia Treatment Guidelines for Patients.)
Exercise can improve your physical and emotional health.
- It improves your cardiovascular (heart and circulation) fitness.
- It strengthens your muscles.
- It reduces fatigue.
- It lowers anxiety and depression.
- It makes you feel generally happier.
- It helps you feel better about yourself.
A recent study of women with stage I, II, or III colorectal cancer showed that increasing their recreational physical activity after being diagnosed with cancer reduces the risk of death from colorectal and from other causes. The level of activity needed to significantly reduce risk in this study was 8 to 10 hours of brisk walking per week. Any person that has been treated for colorectal cancer may also be at risk for a second colorectal cancer or even for other types of cancer, and we know that exercise plays a role in preventing some cancers. The American Cancer Society, in its guidelines on physical activity for cancer prevention, recommends that adults take part in at least 1 physical activity for 30 minutes or more on 5 days or more of the week. Children and teens are encouraged to try for at least 60 minutes a day of energetic physical activity on at least 5 days a week.
How About Your Emotional Health?
Once your treatment ends, you may find yourself overwhelmed by emotions. This happens to a lot of people. You may have been going through so much during treatment that you could only focus on getting through your treatment.
Now you may find that you think about the potential of your own death, or the effect of your cancer on your family, friends, and career. You may also begin to re-evaluate your relationship with your spouse or partner. Unexpected issues may also cause concern — for instance, as you become healthier and have fewer doctor visits, you will see your health care team less often. That can be a source of anxiety for some.
This is an ideal time to seek out emotional and social support. You need people you can turn to for strength and comfort. Support can come in many forms: family, friends, cancer support groups, church or spiritual groups, online support communities, or individual counselors.
Almost everyone who has been through cancer can benefit from getting some type of support. What’s best for you depends on your situation and personality. Some people feel safe in peer-support groups or education groups. Others would rather talk in an informal setting, such as church. Others may feel more at ease talking one-on-one with a trusted friend or counselor. Whatever your source of strength or comfort, make sure you have a place to go with your concerns.
The cancer journey can feel very lonely. It is not necessary or realistic to go it all by yourself. And your friends and family may feel shut out if you decide not include them. Let them in — and let in anyone else who you feel may help. If you aren’t sure who can help, call your American Cancer Society at 1-800-ACS-2345 and we can put you in touch with an appropriate group or resource.
You can’t change the fact that you have had cancer. What you can change is how you live the rest of your life — making healthy choices and feeling as well as possible, physically and emotionally.
What Happens if Treatment Is No Longer Working?
If cancer continues to grow after one kind of treatment, or if it returns, it is often possible to try another treatment plan that might still cure the cancer, or at least shrink the tumors enough to help you live longer and feel better. On the other hand, when a person has received several different medical treatments and the cancer has not been cured, over time the cancer tends to become resistant to all treatment. At this time it’s important to weigh the possible limited benefit of a new treatment against the possible downsides, including continued doctor visits and treatment side effects.
Everyone has his or her own way of looking at this. Some people may want to focus on remaining comfortable during their limited time left.
This is likely to be the most difficult time in your battle with cancer — when you have tried everything medically within reason and it’s just not working anymore. Although your doctor may offer you new treatment, you need to consider that at some point, continuing treatment is not likely to improve your health or change your prognosis or survival.
If you want to continue treatment to fight your cancer as long as you can, you still need to consider the odds of more treatment having any benefit. In many cases, your doctor can estimate the response rate for the treatment you are considering. Some people are tempted to try more chemotherapy or radiation, for example, even when their doctors say that the odds of benefit are less than 1%. In this situation, you need to think about and understand your reasons for choosing this plan.
No matter what you decide to do, it is important that you be as comfortable as possible. Make sure you are asking for and getting treatment for any symptoms you might have, such as pain. This type of treatment is called “palliative” treatment.
Palliative treatment helps relieve these symptoms, but is not expected to cure the disease; its main purpose is to improve your quality of life. Sometimes, the treatments you get to control your symptoms are similar to the treatments used to treat cancer. For example, radiation therapy might be given to help relieve bone pain from bone metastasis. Or chemotherapy might be given to help shrink a tumor and keep it from causing a bowel obstruction. But this is not the same as receiving treatment to try to cure the cancer.
At some point, you may benefit from hospice care. Most of the time, this can be given at home. Your cancer may be causing symptoms or problems that need attention, and hospice focuses on your comfort. You should know that receiving hospice care doesn’t mean you can’t have treatment for the problems caused by your cancer or other health conditions. It just means that the focus of your care is on living life as fully as possible and feeling as well as you can at this difficult stage of your cancer.
Remember also that maintaining hope is important. Your hope for a cure may not be as bright, but there is still hope for good times with family and friends — times that are filled with happiness and meaning. In a way, pausing at this time in your cancer treatment is an opportunity to refocus on the most important things in your life. This is the time to do some things you’ve always wanted to do and to stop doing the things you no longer want to do.
What’s New in Colorectal Cancer Research and Treatment?
Research is always under way in the area of colorectal cancer. Scientists are looking for causes and ways to prevent colorectal cancer as well as ways to improve treatments.
Chemoprevention: Chemoprevention is the use of natural or man-made chemicals to lower a person’s risk of developing cancer. Researchers are testing whether fiber supplements, minerals (such as calcium), and vitamins (such as vitamin D) can lower colorectal cancer risk. Some studies have found that people who take multivitamins containing folic acid (also known as folate) have a lower colorectal cancer risk than people who do not. Recent studies have found that people who took vitamin D supplements had a reduced rate of colorectal cancer. Increasing calcium intake by using calcium supplements or eating extra amounts of low-fat dairy products may reduce formation of colorectal adenomatous polyps.
Although taking aspirin or some other non-steroidal anti-inflammatory drugs (NSAIDs) is associated with a lower risk of colorectal cancer, these drugs can cause stomach ulcers and other side effects. For this reason, taking NSAIDs specifically for this purpose is not recommended for people at average colorectal cancer risk.
NSAIDs, such as sulindac and celecoxib (Celebrex), have been shown to reduce formation of adenomatous polyps in people with familial adenomatous polyposis (FAP). The FDA has recently approved celecoxib for reducing polyp formation in people with FAP. However, recent celecoxib data are now being evaluated for a potential increased heart risk. You should consult with your doctor before beginning regular use of aspirin or another NSAID.
Studies indicate that a diet high in fruits and vegetables may lower colorectal cancer risk, as well as the risk of several other diseases. This hasn’t been completely proven by all studies. But it is important that you eat enough servings — at least 5 a day!
Most experts recommend that people not take large doses of vitamins, minerals, or other agents unless they are part of a study or are under the advice and care of a doctor.
Genetics: Scientists are learning more about some of the inherited and acquired changes in DNA that cause cells of the colon and rectum to become cancerous. Recent discoveries of inherited genes that increase a person’s risk of developing colorectal cancer are already being used in genetic tests to inform people most at risk.
Advances in understanding how these genes work are expected to eventually lead to new drugs and gene therapies to correct these gene problems. Early phases of gene therapy trials are already in progress. Researchers have developed ways to package DNA of normal p53 genes into a virus designed in the laboratory. Most colorectal cancer cells have defects of this tumor suppressor gene that contribute to their abnormal growth and spread. Studies are under way to see whether these designer viruses containing normal p53 genes can infect colorectal cancer cells and either stop their growth or cause them to "self-destruct."
Earlier detection: Studies continue to evaluate the effectiveness of current colorectal cancer screening methods and evaluate new approaches to informing the public about the importance of taking advantage of these methods. Less than half of Americans age 50 or older have any colorectal cancer screening at all. If everyone were tested as recommended, tens of thousands of lives could be saved each year. The American Cancer Society and other public health organizations are working to increase awareness of colorectal cancer screening among the general public and health care professionals. Meanwhile, new imaging and laboratory tests are also being developed and tested.
Virtual colonoscopy (also known as CT colonography) is a special type of CT scan that can find colorectal polyps and cancers at least as accurately as a barium enema. This test is described in more detail in the section, “Can Colorectal Polyps and Cancer Be Found Early?” Although virtual colonoscopy is currently not included among the tests recommended by American Cancer Society for early detection of colorectal cancer, the Society is carefully following progress in this area as technology improves and more results become available about its accuracy.
Immunotherapy: Experimental treatments that boost the patient’s immune reaction to fight colorectal cancer more effectively are being tested in clinical trials. Some treatments use drugs like interferons and interleukins that boost the immune system in general.
In active immunotherapy, the patient is given a vaccine that might cause the immune system to recognize some of the abnormal chemicals in colorectal cancer cells and kill these cells. For example, the K-ras oncogene product is altered in many colorectal cancers and researchers are testing ways to help the patient’s immune system attack cells with an altered ras protein. Researchers are also testing vaccines to direct a patient’s immune system to attack colorectal cancer cells that produce carcinoembryonic antigen (CEA). There are also studies where patients’ tumor cells are used to produce a vaccine. The vaccine is used for adjuvant therapy in the hope of preventing recurrence.
Passive immunotherapy uses antibodies made in the laboratory and then injected into patients to seek out colorectal cancer cells that contain abnormal ras protein or other abnormal or overproduced proteins like carcinoembryonic antigen (CEA) or the HER-2 oncogene product. Toxins or radioactive atoms can be attached to these antibodies, so that the cellkilling chemicals or radiation is targeted specifically to the cancer cells and do not attack the healthy cells of the body. Two antibodies, cetuximab (Erbitux) and bevacizumab (Avastin), are discussed below.
Tumor growth factors: Researchers have discovered naturally occurring substances in the body that promote cell growth. These hormone-like substances are called growth factors. Growth factors activate cells by attaching to growth factor receptors, which are present on the outer surface of the cells. Some cancer cells grow especially fast because they contain more growth factor receptors than normal cells do. One of the growth factors that has been linked to colorectal cancers is called epidermal growth factor (EGF).
New drugs like cetuximab (Erbitux) and panitumumab (Vectibix) that specifically kill cancer cells by attacking EGF receptors have proven effective and are now being used. More are being developed.
Another growth factor, known as vascular endothelial growth factor (VEGF), helps tumors develop new blood vessels to get nutrients. Several drugs are now in development to try to block VEGF in order to cut off the tumor’s blood supply. These drugs are known as antiangiogenesis drugs.
One such drug, bevacizumab (Avastin), is a monoclonal antibody that attacks VEGF. This has proven effective also and is now being used to treat colorectal cancer. Other drugs that act against blood vessels are being developed and tested.
Chemotherapy: Many clinical trials are testing new chemotherapy drugs or drugs that are now used against other cancers (such as cisplatin or gemcitabine). Other studies are looking at ways to combine drugs already known to be active against colorectal cancer, such as irinotecan or oxaliplatin, to improve their effectiveness. Newer studies are adding cetuximab or bevacizumab to chemotherapy as adjuvant therapy. Still other studies are testing the best ways to combine chemotherapy with radiation therapy and/or immunotherapy.
More Information from Your American Cancer Society
We have selected some related information that may also be helpful to you. These materials may be viewed on our Web site or ordered from our toll-free number, 1-800-ACS-2345.
After Diagnosis: A Guide for Patients and Families (also available in Spanish)
ACS/NCCN Colon and Rectal Cancer: Treatment Guidelines for Patients
Nutrition for the Person With Cancer: A Guide for Patients and Families (also available in Spanish)
Colostomy — A Guide (also available in Spanish)
Sexuality & Cancer: For the Man Who Has Cancer and His Partner (also available in Spanish)
Sexuality & Cancer: For the Woman Who Has Cancer and Her Partner (also available in Spanish)
The following book is available from the American Cancer Society. Call us at 1-800-ACS- 2345 to ask about costs or to place your order.
The American Cancer Society’s Complete Guide to Colorectal Cancer
Caregiving: A Step-By-Step Resource for Caring for the Person With Cancer at Home
National Organizations and Web Sites*
In addition to the American Cancer Society, other sources of patient information and support include:
American College of Gastroenterology Internet Address: www.acg.gi.org
American Gastroenterological Association Telephone: 1-301-654-2055 Internet Address: www.gastro.org
American Society of Colon and Rectal Surgeons Internet Address: www.fascrs.org
Colon Cancer Alliance Telephone: 1-877-422-2030 Internet Address: www.ccalliance.org
National Cancer Institute Telephone 1-800-4-CANCER or 1-800-422-6237; TTY: 1-800-332-8615 Internet Address: www.cancer.gov
National Colorectal Cancer Research Alliance Internet Address: www.eif.nccra.org
*Inclusion on this list does not imply endorsement by the American Cancer Society.
The following book is one woman’s experience with colon cancer and with the health care system. The book provides lessons about how to deal with unexpected life-threatening illnesses; how to identify and assess treatment options; how to communicate with health care providers; and how to navigate the health care system.
Kingson, Eric C. Lessons from Joan: Living and Loving with Cancer, a Husband’s Story. Syracuse University Press. Syracuse, NY. www.SyracuseUniversityPress.syr.edu
*Inclusion on this list does not imply endorsement by the American Cancer Society.
The American Cancer Society is happy to address almost any cancer-related topic. If you have any more questions, please call us at 1-800-ACS-2345 at any time, 24 hours a day.
American Cancer Society. Cancer Facts and Figures 2007. Atlanta, GA: American Cancer Society; 2007.
American Joint Committee on Cancer. Colon and Rectum. In: AJCC Cancer Staging Manual. 6th ed. New York: Springer. 113-124.
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Last Review Date: 2/22/2007
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