Gastrointestinal stromal tumors (GISTs) are uncommon cancers that start in special cells in the wall of the gastrointestinal (GI) tract, also known as the digestive tract. 
Gastrointestinal stromal tumors (GISTs) are uncommon cancers that start in special cells in the wall of the gastrointestinal (GI) tract, also known as the digestive tract. 