Immune Repertoire Decoding for Chronic Pancreatitis-to-Pancreatic Cancer Risk Stratification

Inclusion Criteria: * Adults aged 18 years or older. * Able to understand the study procedures and provide written informed consent. * Healthy controls: participants without a known history of chronic pancreatitis or pancreatic cancer. * Chronic pancreatitis cohort: participants diagnosed with chronic pancreatitis according to clinical guidelines, based on clinical, imaging, and/or genetic information. * Pancreatic ductal adenocarcinoma cohort: participants with newly diagnosed pancreatic ductal adenocarcinoma based on clinical, imaging, and/or pathological evaluation. * Willing to provide blood samples and relevant clinical information. * For participants with chronic pancreatitis, willing to undergo longitudinal follow-up approximately every 6 to 12 months. Exclusion Criteria: * Unable or unwilling to provide written informed consent. * Unable to provide required clinical information or biological samples. * Prior diagnosis of another active malignant tumor, except adequately treated non-melanoma skin cancer or carcinoma in situ, if considered not to affect study participation by the investigator. * Current severe acute infection or other serious medical condition that, in the investigator's judgment, may interfere with study participation or interpretation of immune-related analyses. * Use of systemic immunosuppressive therapy or immunotherapy within a period considered clinically relevant by the investigator. * Any condition that, in the investigator's judgment, makes …