The vast majority of pancreatic cancers are adenocarcinomas (cancers arising from glandular linings). Given that the role of the pancreas is to secrete digestive juices/enzymes into the gut, it is not surprising that this is the type of cancer that arises here. There is no useful subtyping of the pancreatic adenocarcinoma into better outlook and worse.
The pancreas is also a hormone gland, secreting insulin and glucagon. Tumours of these cell types give rise to malignant apudomas.