To confirm the pro-viral role of CTSB in the pancreas, acinar cell 266-6 and pancreatic ductal adenocarcinoma (PDAC) cell line SW1990 cells were analyzed for viral level upon treatment with specific CTSB inhibitor CA074Me (5–40 μM) for 12 h. This evidence concerns the gene CTSB and pancreatic ductal adenocarcinoma.