PCDH17 and colorectal carcinoma: Furthermore, the percentages of cases with high expression of PCDH17 and BECN1 were 52.4% (11/21 cases) and 81% (17/21 cases), respectively, in chemosensitive CRC tissues but only 7.7% (2/39 cases) and 30.8% (12/39 cases), respectively, in chemoresistant tissues.