It has been reported that GIST in the mesentery and greater omentum, structures which lack ICCs, are derived from mesenchymal cells that are less differentiated than ICCs[3], ICC precursors straying into the abdominal cavity[4], or KIT-positive cells similar to ICCs immediately below mesothelial cells in the greater omentum[5]. This evidence concerns the gene KIT and intrahepatic cholangiocarcinoma.