Primary Objective: Establish a cohort for immunotherapy combined with chemotherapy in advanced pancreatic cancer, ultimately developing predictive models for immunotherapy response based on proteomics, metabolomics, and microbiome data.
Secondary Objectives: Map the clinical and genomic/metabolomic/microbiome profiles of patients with advanced pancreatic ductal adenocarcinoma, evaluate the therapeutic efficacy of immunotherapy combined with chemotherapy, and explore potential biomarkers for predicting immunotherapy response.