Cancro allo stomaco

What is stomach cancer?

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.

Adenocarcinoma of the stomach

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:

• The tumour may invade deeper into the wall of the stomach. In time, it may pass through the wall of the stomach and invade nearby organs such as the pancreas or liver.

• The tumour may spread up or down the stomach into the gullet (oesophagus) or small intestine.

• Some cells may break off into the lymph channels or bloodstream. The cancer may then spread to nearby lymph nodes or spread to other areas of the body (metastasise).

Other types of stomach cancer

There are some less common and rare types of stomach cancer which include:

• Lymphomas. These are cancers which arise from the lymphatic tissue (part of the immune system) within the wall of the stomach.

• Sarcomas. These are cancers which arise from the muscle or connective tissue within the wall of the stomach.

• Carcinoid cancers. These are cancers which arise from cells in the stomach lining which make hormones.

The rest of this leaflet only discusses adenocarcinoma of the stomach.

Vedi l'opuscolo separato intitolato Cancro per ulteriori informazioni generali sul cancro.

The upper gut

To understand stomach cancer, it helps to know about the normal structure and function of the stomach.

The stomach is in the upper tummy (abdomen). It is part of the gut (gastrointestinal tract). It lies in the upper part of the abdomen, just below the ribs. When we eat, food passes down the gullet (oesophagus) into the stomach.

The stomach is part of the digestive system and makes acid and some chemicals (enzymes) which help to digest food. The muscles in the wall of the stomach tighten (contract) to mix up the food with the acid and enzymes.

Food then passes into the first part of the small intestine (the duodenum). Here food mixes with more enzymes which come from the pancreas and lining of the gut. The enzymes break down (digest) the food.

Digested food is then absorbed into the body from the small intestine.

A cancerous (malignant) 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. (Vedi l'opuscolo separato chiamato Cancro per maggiori dettagli.)

Many people develop stomach cancer for no apparent reason. However, certain risk factors increase the chance that stomach cancer may develop. These include:

• Ageing. Stomach cancer is more common in older people. Most cases are in people over the age of 55.

• Having a type of anaemia called pernicious anaemia, which causes a lack of vitamin B12, can very slightly increase your risk of stomach cancer.

• Diet is probably a factor:
  

  • Countries such as Japan, where people eat a lot of salt, and pickled and smoked foods, have a high rate of stomach cancer.

  • Eating a lot of fruit and green vegetables can reduce the risk.

• Smokers have a higher rate of stomach cancer compared with people who do not smoke.

• Long-term infection of the stomach lining with a germ (bacterium) called Helicobacter pylori (H. pylori) seems to lead to a slightly higher risk of stomach cancer. (This infection is very common in the UK, and most people with H. pylori infection do not develop stomach cancer. See the separate leaflet called Helicobacter Pylori and Stomach Pain for more details.)

• Gender. Stomach cancer is twice as common in men as it is in women.

• If you have had part of your stomach removed in the past for any reason. For example, to treat a stomach ulcer or some other condition.

• Family history. For some cases, stomach cancer may run in the family. However, most cases of stomach cancer do not run in families and are not inherited.

• Blood group A. People who have this blood group have a slightly higher risk.

When a stomach (gastric) 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:

• Pain or discomfort in the upper tummy (abdomen), especially after eating.

• Indigestione. (Nota: most people who have indigestion do not have stomach cancer.)

• Feeling sick, and being off food. Some people have a sense of fullness after eating.

• Weight loss and/or loss of appetite.

• You may pass sangue out with your stools (faeces). This usually presents as black faeces (called melaena) or dark blood rather than bright red bleeding - which is more unusual with stomach cancer - and implies very serious bleeding in the stomach or bowel.

As the cancer grows in the stomach, symptoms may become worse and may include:

• Gli stessi sintomi di cui sopra, ma più gravi.

• Feeling generally unwell and more tired than usual.

• Becoming anaemic if the tumour regularly bleeds. This can cause you to become more tired than usual.

• The cancer growing very large and causing a blockage to food and drink.

Se il cancro si diffonde ad altre parti del corpo, possono svilupparsi vari altri sintomi.

Nota: all the above symptoms can be due to other conditions, so tests are needed to confirm stomach cancer.

Initial assessment and gastroscopy (endoscopy)

If a doctor suspects that you may have stomach (gastric) cancer, he or she may examine you. The examination is often normal, especially if the cancer is at an early stage. Therefore, a gastroscopy is usually arranged. A gastroscope (endoscope) is a thin, flexible, telescope. It is passed through the mouth, into the gullet (oesophagus) and down towards the stomach and the first part of the small intestine (the 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. (Vedi l'opuscolo separato chiamato Gastroscopia (Endoscopia) per ulteriori dettagli.)

Biopsy - to confirm the diagnosis

When a small sample of tissue is removed from a part of the body, the procedure is called a biopsy. The sample is then examined under the microscope to look for abnormal cells. When you have a gastroscopy, if anything abnormal is seen, 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.

Valutare l'estensione e la diffusione

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, una tomografia computerizzata (TC), una risonanza magnetica (RM), un'ecografia, laparoscopia or other tests such as blood tests. This assessment is called staging of the cancer.

L'obiettivo della stadiazione è scoprire:

• How much the tumour in the stomach has grown, and whether it has grown partially or fully through the wall of the stomach.

• Se il cancro si è diffuso ai linfonodi locali.

• Se il cancro si è diffuso ad altre aree del corpo (metastatizzato).

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). (Consulta l'opuscolo separato intitolato Stadi del Cancro per maggiori dettagli.)

Treatment options which may be considered include surgery, chemotherapy (and sometimes radiotherapy). The treatment advised for each case depends on various factors, such as:

• How large the cancer is.

• Whether it has spread (the stage of the cancer).

• La tua salute generale.

Chirurgia

Surgery to remove 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 (keyhole 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.

Chemioterapia

Chemotherapy is a treatment of cancer by using anti-cancer medicines which kill cancer cells or stop them from multiplying. (See the 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, chemotherapy is given before surgery, to shrink a large tumour so that surgery is easier - this is known as neoadjuvant chemotherapy.

Radioterapia

Radiotherapy is a treatment which uses high-energy beams of radiation which are focused on cancerous tissue. This kills cancer cells, or stops cancer cells from multiplying. (Vedi l'opuscolo separato chiamato Radioterapia per maggiori dettagli.) 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.

Chemoradiotherapy

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.

Cibo e dieta

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.

Dovresti avere una discussione completa con uno specialista che conosce il tuo caso. Sarà in grado di fornire i pro e i contro, il tasso di successo probabile, i possibili effetti collaterali e altri dettagli sulle varie opzioni di trattamento possibili per il tuo tipo di cancro.

You should also discuss with your specialist about the aims of treatment in your situation.

To cure cancer

Treatment may aim to cure the cancer. Some stomach (gastric) cancers can be cured, particularly if they are treated in the early stages of the disease. (Doctors tend to use the word remission rather than the word cured. Remission means there is no evidence of cancer following treatment. If you are in remission, you may be cured. However, in some cases a cancer returns months or years later. This is why doctors are sometimes reluctant to use the word cured.)

To control cancer

Il trattamento può mirare a controllare il cancro. Se una cura non è realistica, con il trattamento è spesso possibile limitare la crescita o la diffusione del cancro in modo che progredisca meno rapidamente. Questo può mantenerti libero dai sintomi per un po' di tempo.

To ease symptoms

Treatment may aim to ease symptoms. If a cure is not possible, treatments may be used to reduce the size of a cancer, which may ease symptoms such as pain. If a cancer is advanced, you may require treatments such as:

• Food supplements.

• Painkillers.

• Other techniques to help keep you free of pain or other symptoms.

Without treatment, a stomach (gastric) 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. Stomach cancer often causes no, or few, symptoms in the early stages. When it does cause symptoms, they can be easily mistaken for other more common stomach conditions at first.

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 (prognosis) 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.

We don't have a way to prevent stomach cancer completely.

However, there are some things which can help to reduce the risk of it happening, such as:

• Stopping, or avoiding, smoking. Smoking increases the risk of stomach cancer, and many other types of cancer.

• Eating a healthy diet with plenty of fresh fruit and vegetables, and whole-grain cereals.

• Maintaining a healthy weight. Obesità has been linked with a higher risk of stomach cancer (and other cancers), so losing weight if overweight or obese may reduce the risk.

• Treating Helicobacter pylori l'infezione. Helicobacter pylori infection is linked with an increased risk of stomach cancer, although the risk is small. Treating Helicobacter pylori reduces this risk. Currently, in the UK, we only test for Helicobacter pylori in people with symptoms of stomach problems (see the Helicobacter pylori leaflet for more information). Testing people without symptoms, or 'screening', for Helicobacter pylori, is probably not an effective way to prevent stomach cancer in the UK, but some people have suggested it might be beneficial in countries where stomach cancer is more common.