MicroRNAs as Bile-based Biomarkers in Pancreaticobiliary Cancers

pancreatic or biliary-tract cancer can be a serious diagnosis, as many patients present too late for surgery. Cancer cells have been found to release small messenger molecules called that regulate cancer genes called microRNAs (miRNAs). The goal of this observational study is to learn about the role of miRNAs from bile and blood samples in patients with pancreatic cancer and bile duct cancer. The main question\[s\] it aims to answer are: * Can this detect patients presenting with jaundice (yellow-skin) undergoing endoscopy? * Can this distinguish between the types of cancer? Participants will have blood and bile samples collected prior to diagnosis and their clinical pathway will be followed up for 6 months.