Nab-paclitaxel and Gemcitabine in Metastatic Pancreatic Cancer

While GT (Gemcitabine + Nab-paclitaxel) is one of the preferred regimens for metastatic pancreatic cancer, we have yet to determine the optimum number of cycles for GT treatment regimen. In this single arm, open-label clinical trial, metastatic pancreatic cancer patients will be received nab-paclitaxel 100 mg/m\^2 (iv, 30 minutes) and gemcitabine 1000 mg/m\^2 for 3 weeks, followed by one week without treatment. Treatment repeats every 4 weeks until the disease recurrence or unacceptable toxicity, death or begin a novel therapeutic. The safety and efficacy of each group will be assessed through ORR, PFS, OS and adverse effects as graded by CTC-AE 5.0.