Anlotinib Plus PD-1 Inhibitor as 2nd-line Threapy in Patients With Metastatic Pancreatic Cancer

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• Concurrent use of any other anti-cancer therapy, including chemotherapy, targeted therapy, immunotherapy, or biological agents. • Participants with known brain metastases should be excluded from this clinical trial because of their poor prognosis and because they often develop progressive neurologic dysfunction that would confound the evaluation of neurologic and other adverse events. Screening for brain metastases with head imaging is not required. • History of allergic reactions attributed to compounds of similar chemical or biologic composition to above drugs or other agents used in study. • History of prior or current synchronous malignancy, except: o Malignancy that was treated with curative intent and for which there has been no known active disease for \>3 years prior to enrollment • Uncontrolled inter-current illness including, but not limited to, ongoing or active infection, NYHA class III/IV congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements.