KLK4 and pancreatic adenocarcinoma: Our correlation analysis identified the members of kallikrein family, KLK7, KLK8, KLK10, as the most highly co-expressed with KLK6. Of interest, KLK6 and KLK10 overexpression and co-expression has been reported in pancreatic adenocarcinomas as an unfavorable factor associated with a poor OS [32].