RecruitingDrug trialSurufatinib Plus Camrelizumab and AS in First Line Treatment of Advanced Metastatic Pancreatic CancerThis study is designed to explore the efficacy and safety of surufatinib combined with camrelizumab and AS (nab-paclitaxel and S-1) as first-line treatment compared with AG (nab-paclitaxel and gemcitabine) in unresectable advanced or metastatic pancreatic cancer.