<prompt> What is false about GIST -Associated with c-kit mutationMost common site is stomachAssociated with CD 117Least common mesenchymal neoplasm of gastrointestinal tract  <response>: Answer- D. Least common mesenchymal neoplasm of gastrointestinal tractGISTs are the most common mesenchymal neoplasm of gastrointestinal tract.The most useful marker of GIST is c-kit CD-117.The most common site being the stomach followed by small intestine. 