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Article title: What You Need To Know About Stomach Cancer: NCI
Each year, about 24,000 people in the United States learn that they have cancer of the stomach. This National Cancer Institute (NCI) booklet will give you important information about the symptoms, diagnosis, and treatment of stomach cancer. This booklet also has information to help you deal with this disease if it affects you or someone you know.
Words that may be new to readers appear in italics. Definitions of these words and other terms related to stomach cancer can be found in the Dictionary. For some words, a "sounds-like" spelling is also given.
Other NCI booklets are listed in the Other Booklets section. Our materials cannot answer every question you may have about stomach cancer. They cannot take the place of talks with doctors, nurses, and other members of the health care team. We hope our information will help with those talks.
Researchers continue to look for better ways to diagnose and treat cancer of the stomach, and our knowledge is growing. For up-to-date information or to order this publication, call the NCI-supported Cancer Information Service (CIS) toll free at 1-800-4-CANCER (1-800-422-6237).
The stomach is part of the digestive system. It is located in the upper abdomen, under the ribs. The upper part of the stomach connects to the esophagus, and the lower part leads into the small intestine.
When food enters the stomach, muscles in the stomach wall create a rippling motion that mixes and mashes the food. At the same time, juices made by glands in the lining of the stomach help digest the food. After about 3 hours, the food becomes a liquid and moves into the small intestine, where digestion continues.
The stomach in the abdomen
Cancer is a group of more than 100 different diseases. They affect the body's basic unit, the cell. Cancer occurs when cells become abnormal and divide without control or order.
Like all other organs of the body, the stomach is made up of many types of cells. Normally, cells divide to produce more cells only when the body needs them. This orderly process helps keep us healthy.
Benign tumors are not cancer. They can usually be removed and, in most cases, they do not come back. Most important, cells from benign tumors do not spread to other parts of the body. Benign tumors are rarely a threat to life.
Malignant tumors are cancer. Cancer cells can invade and damage tissues and organs near the tumor. Also, cancer cells can break away from a malignant tumor and enter the bloodstream or lymphatic system. This is how cancer spreads from the original (primary) tumor to form new tumors in other parts of the body. The spread of cancer is called metastasis.
Stomach cancer (also called gastric cancer) can develop in any part of the stomach and may spread throughout the stomach and to other organs. It may grow along the stomach wall into the esophagus or small intestine.
It also may extend through the stomach wall and spread to nearby lymph nodes and to organs such as the liver, pancreas, and colon. Stomach cancer also may spread to distant organs, such as the lungs, the lymph nodes above the collar bone, and the ovaries.
When cancer spreads to another part of the body, the new tumor has the same kind of abnormal cells and the same name as the primary tumor. For example, if stomach cancer spreads to the liver, the cancer cells in the liver are stomach cancer cells. The disease is metastatic stomach cancer (it is not liver cancer). However, when stomach cancer spreads to an ovary, the tumor in the ovary is called a Krukenberg tumor. (This tumor, named for a doctor, is not a different disease; it is metastatic stomach cancer. The cancer cells in a Krukenberg tumor are stomach cancer cells, the same as the cancer cells in the primary tumor.)
Stomach cancer can be hard to find early. Often there are no symptoms in the early stages and, in many cases, the cancer has spread before it is found. When symptoms do occur, they are often so vague that the person ignores them. Stomach cancer can cause the following:
Indigestion or a burning sensation (heartburn);
Discomfort or pain in the abdomen;
Nausea and vomiting;
Diarrhea or constipation;
Bloating of the stomach after meals;
Loss of appetite;
Weakness and fatigue; and
Bleeding (vomiting blood or having blood in the stool).
Any of these symptoms may be caused by cancer or by other, less serious health problems, such as a stomach virus or an ulcer. Only a doctor can tell the cause. People who have any of these symptoms should see their doctor. They may be referred to a gastroenterologist, a doctor who specializes in diagnosing and treating digestive problems. These doctors are sometimes called gastrointestinal (or GI) specialists.
To find the cause of symptoms, the doctor asks about the patient's medical history, does a physical exam, and may order laboratory studies. The patient may also have one or all of the following exams:
Fecal occult blood test -- a check for hidden (occult) blood in the stool. This test is done by placing a small amount of stool on a plastic slide or on special paper. It may be tested in the doctor's office or sent to a laboratory. This test is done because stomach cancer sometimes causes bleeding that cannot be seen. However, noncancerous conditions also may cause bleeding, so having blood in the stool does not necessarily mean that a person has cancer.
Upper GI series -- x-rays of the esophagus and stomach (the upper gastrointestinal, or GI, tract. The x-rays are taken after the patient drinks a barium solution, a thick, chalky liquid. (This test is sometimes called a barium swallow.) The barium outlines the stomach on the x-rays, helping the doctor find tumors or other abnormal areas. During the test, the doctor may pump air into the stomach to make small tumors easier to see.
Endoscopy -- an exam of the esophagus and stomach using a thin, lighted tube called a gastroscope, which is passed through the mouth and esophagus to the stomach. The patient's throat is sprayed with a local anesthetic to reduce discomfort and gagging. Patients also may receive medicine to relax them. Through the gastroscope, the doctor can look directly at the inside of the stomach. If an abnormal area is found, the doctor can remove some tissue through the gastroscope. Another doctor, a pathologist, examines the tissue under a microscope to check for cancer cells. This procedure -- removing tissue and examining it under a microscope -- is called a biopsy. A biopsy is the only sure way to know whether cancer cells are present.
A patient who needs a biopsy may want to ask the doctor some of these questions:
How long will the procedure take? Will I be awake? Will it hurt?
How soon will I know the results?
If I do have cancer, who will talk with me about treatment? When?
If the pathologist finds cancer cells in the tissue sample, the patient's doctor needs to know the stage, or extent, of the disease. Staging exams and tests help the doctor find out whether the cancer has spread and, if so, what parts of the body are affected. Because stomach cancer can spread to the liver, the pancreas, and other organs near the stomach as well as to the lungs, the doctor may order a CT (or CAT) scan, an ultrasound exam, or other tests to check these areas.
Staging may not be complete until after surgery. The surgeon removes nearby lymph nodes and may take samples of tissue from other areas in the abdomen. All of these samples are examined by a pathologist to check for cancer cells. Decisions about treatment after surgery depend on these findings.
The doctor develops a treatment plan to fit each patient's needs. Treatment for stomach cancer depends on the size, location, and extent of the tumor; the stage of the disease; the patient's general health; and other factors.
Many people who have cancer want to learn all they can about the disease and their treatment choices so they can take an active part in decisions about their medical care. The doctor is the best person to answer questions about their diagnosis and treatment plan.
When a person is diagnosed with cancer, shock and stress are natural reactions. These feelings may make it difficult for people to think of everything they want to ask the doctor. Often, it helps to make a list of questions. Also, to help remember what the doctor says, patients may take notes or ask whether they may use a tape recorder. Some people also want to have a family member or friend with them when they talk to the doctor -- to take part in the discussion, to take notes, or just to listen. Patients should not feel the need to ask all their questions or remember all the answers at one time. They will have other chances to ask the doctor to explain things and to get more information.
When talking about treatment choices, the patient may want to ask about taking part in a research study. Such studies, called clinical trials, are designed to improve cancer treatment. More information about clinical trials is in the Clinical Trials section.
These are some questions a patient may want to ask the doctor before treatment begins:
What is the stage of the disease?
What are my treatment options? Which do you suggest for me? Why?
Would a clinical trial be appropriate for me?
What are the expected benefits of the treatment?
What are the risks and possible side effects of the treatment?
What can be done about side effects?
What can I do to take care of myself during therapy?
How long will my treatment last?
Patients and their loved ones are naturally concerned about the effectiveness of the treatment. Sometimes they use statistics to try to figure out whether the patient will be cured, or how long he or she will live. It is important to remember, however, that statistics are averages based on large numbers of patients. They cannot be used to predict what will happen to a particular person because no two cancer patients are alike; treatments and responses vary greatly. Patients may want to talk with the doctor about the chance of recovery (prognosis). When doctors talk about surviving cancer, they may use the term remission rather than cure. Even though many patients recover completely, doctors use this term because the disease can return. (The return of cancer is called a recurrence.)
Treatment decisions are complex. Sometimes it is helpful for patients to have a second opinion about the diagnosis and the treatment plan. (Some insurance companies require a second opinion; others may pay for a second opinion if the patient requests it.) There are several ways to find another doctor to consult:
The Cancer Information Service, at 1-800-4-CANCER, can tell callers about treatment facilities, including cancer centers and other programs supported by the National Cancer Institute.
Patients can get the names of doctors from their local medical society, a nearby hospital, or a medical school.
Cancer of the stomach is difficult to cure unless it is found in an early stage (before it has begun to spread). Unfortunately, because early stomach cancer causes few symptoms, the disease is usually advanced when the diagnosis is made. However, advanced stomach cancer can be treated and the symptoms can be relieved. Treatment for stomach cancer may include surgery, chemotherapy, and/or radiation therapy. New treatment approaches such as biological therapy and improved ways of using current methods are being studied in clinical trials. A patient may have one form of treatment or a combination of treatments.
Surgery is the most common treatment for stomach cancer. The operation is called gastrectomy. The surgeon removes part (subtotal or partial gastrectomy) or all (total gastrectomy) of the stomach, as well as some of the tissue around the stomach. After a subtotal gastrectomy, the doctor connects the remaining part of the stomach to the esophagus or the small intestine. After a total gastrectomy, the doctor connects the esophagus directly to the small intestine. Because cancer can spread through the lymphatic system, lymph nodes near the tumor are often removed during surgery so that the pathologist can check them for cancer cells. If cancer cells are in the lymph nodes, the disease may have spread to other parts of the body.
These are some questions a patient may want to ask the doctor before surgery:
What kind of operation will I have?
What are the risks of this operation?
How will I feel afterwards? If I have pain, how will you help me?
Will I need a special diet? Who will teach me about my diet?
Chemotherapy is the use of drugs to kill cancer cells. This type of treatment is called systemic therapy because the drugs enter the bloodstream and travel through the body.
Clinical trials are in progress to find the best ways to use chemotherapy to treat stomach cancer. Scientists are exploring the benefits of giving chemotherapy before surgery to shrink the tumor, or as adjuvant therapy after surgery to destroy remaining cancer cells. Combination treatment with chemotherapy and radiation therapy is also under study. Doctors are testing a treatment in which anticancer drugs are put directly into the abdomen (intraperitoneal chemotherapy). Chemotherapy also is being studied as a treatment for cancer that has spread, and as a way to relieve symptoms of the disease.
Most anticancer drugs are given by injection; some are taken by mouth. The doctor may use one drug or a combination of drugs. Chemotherapy is given in cycles: a treatment period followed by a recovery period, then another treatment, and so on. Usually a person receives chemotherapy as an outpatient (at the hospital, at the doctor's office, or at home). However, depending on which drugs are given and the patient's general health, a short hospital stay may be needed.
These are some questions patients may want to ask about chemotherapy:
What is the goal of this treatment?
What drugs will I be taking?
Will the drugs cause side effects? What can I do about them?
How long will I need to take this treatment?
How will we know if the treatment is working?
Radiation therapy (also called radiotherapy) is the use of high-energy rays to damage cancer cells and stop them from growing. Like surgery, it is local therapy; the radiation can affect cancer cells only in the treated area. Radiation therapy is sometimes given after surgery to destroy cancer cells that may remain in the area. Researchers are conducting clinical trials to find out whether it is helpful to give radiation therapy during surgery (intraoperative radiation therapy). Radiation therapy may also be used to relieve pain or blockage.
The patient goes to the hospital or clinic each day for radiation therapy. Usually treatments are given 5 days a week for 5 to 6 weeks.
These are some questions a patient may want ask the doctor before receiving radiation therapy:
What is the goal of this treatment?
How will the radiation be given?
When will the treatment begin? When will it end?
Will I have side effects? What can I do about them?
How will we know if the radiation therapy is working?
Biological therapy (also called immunotherapy) is a form of treatment that helps the body's immune system attack and destroy cancer cells; it may also help the body recover from some of the side effects of treatment. In clinical trials, doctors are studying biological therapy in combination with other treatments to try to prevent a recurrence of stomach cancer. In another use of biological therapy, patients who have low blood cell counts during or after chemotherapy may receive colony-stimulating factors to help restore the blood cell levels. Patients may need to stay in the hospital while receiving some types of biological therapy.
Many patients with stomach cancer are treated in clinical trials (treatment studies). Doctors conduct clinical trials to find out whether a new approach is both safe and effective and to answer scientific questions. Patients who take part in these studies are often the first to receive treatments that have shown promise in laboratory research. In clinical trials, some patients may receive the new treatment while others receive the standard approach. In this way, doctors can compare different therapies. Patients who take part in a trial make an important contribution to medical science and may have the first chance to benefit from improved treatment methods. Researchers also use clinical trials to look for ways to reduce the side effects of treatment and to improve the quality of patients' lives.
Many clinical trials for people with stomach cancer are under way. Patients who are interested in taking part in a trial should talk with their doctor. The booklet Taking Part in Clinical Trials: What Cancer Patients Need To Know explains the possible benefits and risks of treatment studies.
One way to learn about clinical trials is through PDQ«, a computer database developed by the National Cancer Institute. PDQ contains information about cancer treatment and about clinical trials. The Cancer Information Service can provide PDQ information to doctors, patients, and the public.
It is hard to limit the effects of therapy so that only cancer cells are removed or destroyed. Because healthy cells and tissues also may be damaged, treatment can cause unpleasant side effects.
The side effects of cancer treatment are different for each person, and they may even be different from one treatment to the next. Doctors try to plan treatment in ways that keep side effects to a minimum; they can help with any problems that occur. For this reason, it is very important to let the doctor know about any problems during or after treatment.
Gastrectomy is major surgery. For a period of time after the surgery, the person's activities are limited to allow healing to take place. For the first few days after surgery, the patient is fed intravenously (through a vein). Within several days, most patients are ready for liquids, followed by soft, then solid, foods. Those who have had their entire stomach removed cannot absorb vitamin B12, which is necessary for healthy blood and nerves, so they need regular injections of this vitamin. Patients may have temporary or permanent difficulty digesting certain foods, and they may need to change their diet. Some gastrectomy patients will need to follow a special diet for a few weeks or months, while others will need to do so permanently. The doctor or a dietitian (a nutrition specialist) will explain any necessary dietary changes.
Some gastrectomy patients have cramps, nausea, diarrhea, and dizziness shortly after eating because food and liquid enter the small intestine too quickly. This group of symptoms is called the dumping syndrome. Foods containing high amounts of sugar often make the symptoms worse. The dumping syndrome can be treated by changing the patient's diet. Doctors often advise patients to eat several small meals throughout the day, to avoid foods that contain sugar, and to eat foods high in protein. To reduce the amount of fluid that enters the small intestine, patients are usually encouraged not to drink at mealtimes. Medicine also can help control the dumping syndrome. The symptoms usually disappear in 3 to 12 months, but they may be permanent.
Following gastrectomy, bile in the small intestine may back up into the remaining part of the stomach or into the esophagus, causing the symptoms of an upset stomach. The patient's doctor may prescribe medicine or suggest over-the-counter products to control such symptoms.
The side effects of chemotherapy depend mainly on the drugs the patient receives. As with any other type of treatment, side effects also vary from person to person. In general, anticancer drugs affect cells that divide rapidly. These include blood cells, which fight infection, help the blood to clot, or carry oxygen to all parts of the body. When blood cells are affected by anticancer drugs, patients are more likely to get infections, may bruise or bleed easily, and may have less energy. Cells in hair roots and cells that line the digestive tract also divide rapidly. As a result of chemotherapy, patients may have side effects such as loss of appetite, nausea, vomiting, hair loss, or mouth sores. For some patients, the doctor may prescribe medicine to help with side effects, especially with nausea and vomiting. These effects usually go away gradually during the recovery period between treatments or after the treatments stop.
Patients who receive radiation to the abdomen may have nausea, vomiting, and diarrhea. The doctor can prescribe medicine or suggest dietary changes to relieve these problems. The skin in the treated area may become red, dry, tender, and itchy. Patients should avoid wearing clothes that rub; loose-fitting cotton clothes are usually best. It is important for patients to take good care of their skin during treatment, but they should not use lotions or creams without the doctor's advice.
Patients are likely to become very tired during radiation therapy, especially in the later weeks of treatment. Resting is important, but doctors usually advise patients to try to stay as active as they can.
The side effects of biological therapy vary with the type of treatment. Some cause flu-like symptoms, such as chills, fever, weakness, nausea, vomiting, and diarrhea. Patients sometimes get a rash, and they may bruise or bleed easily. These problems may be severe, and patients may need to stay in the hospital during treatment.
It is sometimes difficult for patients who have been treated for stomach cancer to eat well. Cancer often causes loss of appetite, and people may not feel like eating when they are uncomfortable or tired. It is hard for patients to eat when they have nausea, vomiting, mouth sores, or the dumping syndrome. Patients who have had stomach surgery are likely to feel full after eating only a small amount of food. For some patients, the taste of food changes. Still, good nutrition is important. Eating well means getting enough calories and protein to help prevent weight loss, regain strength, and rebuild normal tissues.
Doctors, nurses, and dietitians can offer advice for healthy eating during and after cancer treatment. Patients and their families also may want to read the National Cancer Institute booklet Eating Hints for Cancer Patients, which contains many useful suggestions.
Living with a serious disease is not easy. Cancer patients and those who care about them face many problems and challenges. Coping with these problems is often easier when people have helpful information and support services. Several useful booklets, including Taking Time, are available from the Cancer Information Service.
Cancer patients may worry about holding their job, caring for their family, or keeping up with their daily activities. Concerns about tests, treatments, hospital stays, and medical bills are common. Doctors, nurses, and other members of the health care team can answer questions about treatment, working, or other activities. Meeting with a social worker, counselor, or member of the clergy also can be helpful for patients who want to talk about their feelings or discuss their concerns about the future or about personal relationships.
Friends and relatives can be very supportive. Also, it helps many patients to discuss their concerns with others who have cancer. Cancer patients often get together in support groups, where they can share what they have learned about coping with cancer and the effects of treatment. It is important to keep in mind, however, that each patient is different. Treatments and ways of dealing with cancer that work for one person may not be right for another -- even if they both have the same kind of cancer. It is always a good idea to discuss the advice of friends and family members with the doctor.
Often, a social worker at the hospital or clinic can suggest groups that can help with rehabilitation, emotional support, financial aid, transportation, or home care. For example, the American Cancer Society has many services for cancer patients and their families. Local offices of the American Cancer Society are listed in the white pages of the telephone directory. The Cancer Information Service also has information on local resources.
The stomach cancer rate in the United States and the number of deaths from this disease have gone down dramatically over the past 60 years. Still, stomach cancer is a serious disease, and scientists all over the world are trying to learn more about what causes this disease and how to prevent it. At this time, doctors cannot explain why one person gets stomach cancer and another does not. They do know, however, that stomach cancer is not contagious; no one can "catch" cancer from another person.
Researchers have learned that some people are more likely than others to develop stomach cancer. The disease is found most often in people over age 55. It affects men twice as often as women, and is more common in black people than in white people. Also, stomach cancer is more common in some parts of the world -- such as Japan, Korea, parts of Eastern Europe, and Latin America -- than in the United States. People in these areas eat many foods that are preserved by drying, smoking, salting, or pickling. Scientists believe that eating foods preserved in these ways may play a role in the development of stomach cancer. On the other hand, fresh foods (especially fresh fruits and vegetables and properly frozen or refrigerated fresh foods) may protect against this disease.
Stomach ulcers do not appear to increase a person's risk (chance) of getting stomach cancer. However, some studies suggest that a type of bacteria, Helicobacter pylori, which may cause stomach inflammation and ulcers, may be an important risk factor for this disease. Also, research shows that people who have had stomach surgery or have pernicious anemia, achlorhydria, or gastric atrophy (which generally result in lower than normal amounts of digestive juices) have an increased risk of stomach cancer.
Exposure to certain dusts and fumes in the workplace has been linked to a higher than average risk of stomach cancer. Also, some scientists believe smoking may increase stomach cancer risk.
People who think they might be at risk for stomach cancer should discuss this concern with their doctor. The doctor can suggest an appropriate schedule of checkups so that, if cancer appears, it can be detected as early as possible.
National Cancer Institute printed materials, including the booklets listed below, are available from the Cancer Information Service free of charge by calling 1-800-4-CANCER.
Booklets About Cancer Treatment
Booklets About Living With Cancer
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