A Study of Donafenib Plus S-1 in Treating Patients With Metastatic Pancreatic Cancer After Chemotherapy With Nab-paclitaxel Plus Gemcitabine Regimen

While NG ( Nab-paclitaxel + gemcitabine) is one of the preferred first-line chemotherapy for metastatic pancreatic cancer, we have to investigate possible therapeutic options after NG regimen. In this single arm, open-label clinical trial, metastatic pancreatic cancer patients will be received donafenib and S-1. Treatment repeats every 3 weeks until the disease recurrence or unacceptable toxicity, death or begin a novel therapeutic. The efficacy and safety data will be assessed through OS, ORR, DCR, PFS,TTP and adverse effects as graded by NCI CTC-AE 5.0.