This is a prospective, open-label, single-center, exploratory clinical study. To explore the safety, tolerability, efficacy, immunogenicity, and PK/PD profile of neoantigen personalized mRNA vaccine AK154 monotherapy or combined with AK104 or AK112, sequential mFOLFIRINOX chemotherapy regimen as postoperative adjuvant therapy in Surgically Resected Pancreatic Adenocarcino
