CDH17 and cancer: Flow cytometry and immunofluorescent staining of several gastric (IM95, MKN45, TMK1, and AGS), colorectal (HCT116 and Colon26), and pancreatic (ASPC1 and PancO2) cancer cell lines confirmed that CDH17 was predominantly expressed on the cell membrane surface (Figures S4 and S5, Supporting Information).