A Phase Ib/II Clinical Study of Regorafenib Combined With Toripalimab and Albumin-bound Paclitaxel for the Third-line Treatment of Advanced Pancreatic Cancer

The purpose of this clinical trial is to explore the efficacy and safety of Regorafenib combined with Toripalimab and Paclitaxel-albumin in patients as the third line treatment for patients with unresectable or metastatic pancreatic cancer.The main question it aims to answer is: Phase Ib: Evaluate the maximum tolerated dose (MTD) of regorafenib and/or phase II clinical recommendations Dose (RP2D). Phase II: Evaluation of the efficacy and safety of Regorafenib Combined with Terriptylimab and Albumin Paclitaxel for Late Third Line Treatment for pancreatic cancer patients. Participants will: Phase Ib: Selected patients will receive treatment with Regorafenib at main dose levels of 40, 80, and 120mg/d (po d1-14 Q3W), Toripalimab(240mg, ivgtt, d1, Q3W), and Paclitaxel-albumi(125mg/m2, ivgtt, d1, 8, Q3W) until disease progression or intolerable toxicity occurs. Phase II: Regorafenib: Based on the results of the completed Phase I study, determine the dosage for Phase II (po d1-14 Q3W). Toripalimab (240mg, ivgtt, d1, Q3W) and Paclitaxel-albumi (125mg/m2, ivgtt, d1, 8, Q3W) until disease progression or intolerable toxicity occurs.