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Cancer of the stomach

Stomach cancer (also known as gastric cancer) affects around almost 10,000 people per year in the UK, although the number of cases is decreasing. The decline in the rate of stomach cancer is thought to be associated with improvements in diet.

Stomach cancer affects more men than women. It is rare under the age of 40 and becomes more common with increasing age.

Most types of stomach cancer develop in the cells of the stomach lining and can spread to the whole of the stomach as well as the liver, small intestine, pancreas and bowel. These types of stomach cancer are called adenocarcinomas and are the most common (95% (1)).

There are other rarer types of stomach cancer such as soft tissue sarcoma that develops in the muscle layer of the stomach.

A MALT lymphoma is a rare type of stomach cancer that affects the lymphatic system (network of thin tubes that run throughout the body circulating fluids and fighting infection).

The stomach can also be affected by a type of tumour known as a carcinoid tumour. This is a rare tumour that usually affects the appendix or the small intestine.