RecruitingDrug trialA Phase II/III Trial to Evaluate the Efficacy and Safety of Surufatinib Combined With Camrelizumab, Nab-paclitaxel, and Gemcitabine in Metastatic Pancreatic CancerTo evaluate the efficacy of surufatinib combined with camrelizumab, nab-paclitaxel, and gemcitabine versus nab-paclitaxel plus gemcitabine as the first-line treatment in metastatic pancreatic cancer