What is GIST?
GIST is a rare cancer of the gastrointestinal (GI) tract. Most GISTs develop in the stomach or in the small intestine, and a small percentage develops elsewhere along the GI tract. GIST is difficult to diagnose and to treat because it often does not cause any physical symptoms until already advanced. When GISTs first develop, the tumours stay in one area, such as the stomach. GISTs that stay in their original location are called localised tumours. However, when GISTs advance, they can spread to other parts of the body. When a GIST spreads, it becomes a metastatic tumour. GISTs often grow quite large before they are discovered, and many often spread to other organs, mainly the liver.
