KLK1 and pancreatic neoplasm: Furthermore, down-regulated mRNAs of the kallikrein peptidase family (Klk1, Klk1b3, Klk1b5) and the cholecystokinin receptor type A (CCKAR), and expression of cdh2 coding for N-cadherin as well as somatostatin (Supplemental Table 1) discriminated pancreatic tumors from pancreatic controls.