STING1 and pancreatic ductal adenocarcinoma: We know from our prior studies that STING is not consistently expressed by all cell types; for example, pancreatic acinar cells do not express STING, but the normal ductal cells of the pancreas and transformed pancreatic ductal adenocarcinoma cells express STING [6], and STING is widely expressed by immune cell populations (reviewed in [9]).