Predicting Pancreatic Fistula After Pancreatic Surgery Using Preoperative Immunity

The goal of this observational study is to develop and validate a preoperative immunological signature for predicting postoperative pancreatic fistula (POPF) in adult patients undergoing pancreatic surgery for pancreatic cancer. The main questions it aims to answer are: * Can a preoperative immunological signature accurately predict the occurrence of postoperative pancreatic fistula after pancreatic surgery? * Does the immunological signature provide better predictive performance than currently available predictors? Researchers will also evaluate whether the immunological signature is associated with postoperative readmission, 90-day mortality, and early disease recurrence within one year after surgery. Participants will: * Provide a blood sample during the preoperative assessment visit. * Provide a second blood sample on the day following pancreatic surgery. * Undergo standard postoperative and oncological follow-up for up to 12 months. This is a prospective, multi-center, open-label observational study conducted at Institut Paoli-Calmettes. A total of 310 participants will be enrolled.