Vinegar-induced Collection of Duodenal Pancreatic Juice Via Endoscopic Ultrasound

This is a single center, prospective, randomized-controlled study. Participants who are diagnosed as suspected pancreatic cancer and are schedule to have EUS-FNA will have saline or different amount of vinegar infused into duodenum and pancreatic juiced collected via EUS suction during different period of time under intravenous anesthesia. The collected pancreatic juice will be weighed instantly and frozen in 10 minutes under -80℃ for further tests. Researchers will compare the weight, cfDNA (cell free DNA) concentration, PLA2G1B (Phosphatidylcholine 2-acylhydrolase 1B) concentration, immunoglobulin concentration and KRAS (Kirsten rat sarcoma viral oncogene) mutation load of collected pancreatic juice from different arms.