Although stomach cancer is common worldwide, it is not so common in the UK. Most cases occur in people over the age of 55. If stomach cancer is diagnosed at an early stage, there is a good chance of a cure. In general, the more advanced the cancer (the more it has grown and spread), the less chance that treatment will be curative. However, treatment can often slow the progress of the cancer.
The stomach is is in the upper abdomen. It is part of the gastrointestinal tract (the gut). It lies in the upper part of the abdomen, just below the ribs. When we eat, food passes down the oesophagus (gullet) into the stomach.
The stomach makes acid and some enzymes (chemicals) which help to digest food. The muscles in the wall of the stomach contract to mix up the food with the acid and enzymes.
Food then passes into the duodenum (the first part of the small intestine). Here food mixes with more enzymes which come from the pancreas and lining of the gut. The enzymes digest (break down) the food.
Digested food is then absorbed into the body from the small intestine.
Cancer is a disease of the cells in the body. The body is made up from millions of tiny cells. There are many different types of cell in the body, and there are many different types of cancer which arise from different types of cell. What all types of cancer have in common is that the cancer cells are abnormal and multiply out of control.
A malignant tumour is a lump or growth of tissue made up from cancer cells which continue to multiply. As they grow, malignant tumours invade into nearby tissues and organs, which can cause damage. Malignant tumours may also spread to other parts of the body. This happens if some cells break off from the first (primary) tumour and are carried in the bloodstream or lymph channels to other parts of the body. These small groups of cells may then multiply to form secondary tumours (metastases) in one or more parts of the body. These secondary tumours may then grow, invade and damage nearby tissues, and spread again.
Some cancers are more serious than others, some are more easily treated than others (particularly if diagnosed at an early stage), some have a better outlook (prognosis) than others. So, cancer is not just one condition. In each case it is important to know exactly what type of cancer has developed, how large it has become, and whether it has spread. This will enable you to get reliable information on treatment options and outlook.
See separate leaflet called 'Cancer - What are Cancer and Tumours?' for further details about cancer in general.
Stomach cancer is sometimes called gastric cancer. Worldwide it is one of the most common cancers. It is common in Japan and China but is less common in the UK. About 5,000 people develop stomach cancer each year in the UK. Stomach cancer is more common in men than in women and tends to occur mainly in older people. Most people who develop stomach cancer are over the age of 55.
In most cases, stomach cancer begins from a cell which is on the inside lining of the stomach (the mucosa). This type of stomach cancer is called adenocarcinoma of the stomach. As the cancer cells multiply:
There are some less common and rare types of stomach cancer which include:
The rest of this leaflet only discusses adenocarcinoma of the stomach.
A cancerous tumour starts from one abnormal cell. The exact reason why a cell becomes cancerous is unclear. It is thought that something damages or alters certain genes in the cell. This makes the cell abnormal and multiply out of control. (See separate leaflet called 'Cancer - What Causes Cancer?' for more details.)
Many people develop stomach cancer for no apparent reason. However, certain risk factors increase the chance that stomach cancer may develop. These include:
When a stomach cancer first develops and is small, it usually causes no symptoms. Some do not cause symptoms until they are quite advanced. Initial symptoms may include:
As the cancer grows in the stomach, symptoms may become worse and may include:
If the cancer spreads to other parts of the body, various other symptoms can develop.
Note: all the above symptoms can be due to other conditions, so tests are needed to confirm stomach cancer.
If a doctor suspects that you may have stomach cancer, he or she may examine you. The examination is often normal, especially if the cancer is at an early stage. Therefore, a gastroscopy (endoscopy) is usually arranged.
A gastroscope (endoscope) is a thin, flexible, telescope. It is passed through the mouth, into the oesophagus and down towards the stomach and duodenum. The endoscope contains fibre-optic channels which allow light to shine down so the doctor or nurse can see inside your stomach and duodenum. See separate leaflet called 'Gastroscopy' for more details.
A biopsy is when a small sample of tissue is removed from a part of the body. The sample is then examined under the microscope to look for abnormal cells. When you have a gastroscopy, if anything abnormal is seen then the doctor or nurse can take a biopsy. This is done by passing a thin grabbing instrument down a side channel of the gastroscope. It can take two weeks for the biopsy results.
If you are confirmed to have stomach cancer, further tests may be done to assess if it has spread. For example, a barium meal X-ray, a CT scan, an MRI scan, an ultrasound scan, laparoscopy or other tests. (See separate leaflets which describe each of these tests in more detail.) This assessment is called staging of the cancer.
The aim of staging is to find out:
By finding out the stage of the cancer it helps doctors to advise on the best treatment options. It also gives a reasonable indication of outlook (prognosis). (See separate leaflet called 'Cancer - Staging and Grading Cancer' for more details.)
Treatment options which may be considered include surgery, chemotherapy (and sometimes radiotherapy). The treatment advised for each case depends on various factors such as the stage of the cancer (how large the cancer is and whether it has spread), and your general health.
It is important to make sure you get enough nutrition from your food and you will probably be asked to see a dietician to make sure you are on the best possible diet.
You should have a full discussion with a specialist who knows your case. They will be able to give the pros and cons, likely success rate, possible side-effects, and other details about the various possible treatment options for your type of cancer.
You should also discuss with your specialist the aims of treatment. For example:
Removing the tumour may be curative if the cancer is in an early stage. The common operation is to cut out the affected part of the stomach. Sometimes the whole of the stomach is removed. Sometimes this is done laparoscopically (key-hole surgery). Even if the cancer is advanced and a cure is not possible, some surgical techniques may still have a place to ease symptoms. For example, a blockage may be eased by removing part of the stomach, or by using laser surgery or by a bypass operation.
Chemotherapy is a treatment of cancer by using anti-cancer medicines which kill cancer cells or stop them from multiplying. (See separate leaflet called 'Chemotherapy' for more details.) When chemotherapy is used in addition to surgery it is known as adjuvant chemotherapy. For example, following surgery you may be given a course of chemotherapy. This aims to kill any cancer cells which may have spread away from the primary tumour. Sometimes, adjuvant chemotherapy is given before surgery to shrink a large tumour so that surgery is easier.
Radiotherapy is a treatment which uses high energy beams of radiation which are focussed on cancerous tissue. This kills cancer cells, or stops cancer cells from multiplying. (See separate leaflet called 'Radiotherapy' for more details.) Radiotherapy is not commonly used to treat stomach cancer. It is sometimes used to reduce the size of a particular part of the cancer which is causing symptoms.
In some cases a combination of chemotherapy and radiotherapy - shortened to chemoradiotherapy - is offered, often as an addition to surgery. If you need to have this, it is usually done around the time of the operation.
Without treatment, a stomach cancer is likely to get larger, and spread to other parts of the body. If it is diagnosed and treated at an early stage (before growing through the wall of the stomach or spreading to lymph nodes or other areas of the body) then there is a good chance of a cure with surgery. Unfortunately, most cases in the UK are not diagnosed at an early stage.
If the cancer is diagnosed when it has grown through the wall of the stomach, or spread to other parts of the body, a cure is less likely. However, treatment can often slow down the progression of the cancer using chemotherapy medicines.
The treatment of cancer is a developing area of medicine. New treatments continue to be developed and the information on outlook above is very general. The specialist who knows your case can give more accurate information about your particular outlook, and how well your type and stage of cancer is likely to respond to treatment.
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