You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is GIST is most common in and explain in detail?
Most common nonepithelial tumour of the gastrointestinal tract in which most common site is the stomach about 50%, small intestine constitute about 25%, rectum 15% & colon 10 %. Reference SRB 5 th edition page no. 857