Surufatinib Plus Camrelizumab and AS in First Line Treatment of Advanced Metastatic Pancreatic Cancer

"phase 1b: surufatinib 200 or 250 mg/d, qd po; camrelizumab: 200mg, I.V., D1, Q3W; nab-paclitaxel: 125mg/m2, I.V., D1, D8, Q3W; S-1: 40mg bid, D1-14, Q3W; DLTs will be evaluated at first cycle;~phase 2: surufatinib RP2D + camrelizumab + nab-paclitaxel + S-1 when evaluated SD, PR or CR after 4-6 cycles (according to RECIST 1.1), followed by maintenance treatment: surufatinib + camrelizumab + S-1"

nab-paclitaxel: 125mg/m2, I.V., D1, D8, Q3W; gemcitabine: 1000/m2, ivgtt for more than 30min, D1, D8, Q3W