Inclusion Criteria:

          1. locally advanced pancreatic adenocarcinoma

          2. Patients must have received mFOLFIRINOX or Gemcitabine/ Abraxane based chemotherapy
             for 4 cycles with last dose of therapy between 2-5 weeks of study enrollment.

          3. Age >18 years

          4. No metastatic disease

          5. ECOG Performance Status of 0 to 1

          6. Adequate organ function as defined by study-specified laboratory tests

          7. Patients must be able to have fiducials placed for SBRT

          8. Must use acceptable form of birth control through the study

          9. Signed informed consent form

         10. Willing and able to comply with study procedures

        Exclusion Criteria:

          1. Patients who have been off of mFOLFIRINOX or gemcitabine/abraxane therapy for more
             than 49 days

          2. Patients who have had more than one line of chemotherapy

          3. Patients with uncontrolled intercurrent illness, including but not limited to ongoing
             or active infection, systematic congestive heart failure, unstable angina pectoris,
             cardiac arrhythmia or psychiatric condition that would limit compliance with study
             requirements

          4. Patient who have had prior treatment with IL-2, interferon, anti-PD-1, anti-PD-L1,
             anti-PD-L2, anti-CD137, anti-OX-40, anti-CD40, or anti-CTLA-4 antibodies

          5. Patients receiving active immunosuppressive agents or chronic use of systemic
             corticosteroids within 14 days prior to first dose of study drug

          6. Patients who have received growth factors, including but not limited to
             granulocyte-colony stimulating factor (G-CSF), granulocyte macrophage-colony
             stimulating factor (GM-CSF), erythropoietin, etc. within 14 days of study drug
             administration

          7. Patients with history of any autoimmune disease:inflammatory bowel disease, (including
             ulcerative colitis and Crohn's Disease), rheumatoid arthritis, systemic progressive
             sclerosis (scleroderma), systemic lupus erythematous (SLE) autoimmune vasculitis, CNS
             or motor neuropathy considered to be of autoimmune origin.

          8. Patients who have known history of infection with HIV, hepatitis B, or hepatitis C

          9. Patients with evidence of interstitial lung disease

         10. Patients on home oxygen

         11. Patients with oxygen saturation of <92% on room air by pulse oximetry

         12. Pregnant or lactating

         13. Conditions, including alcohol or drug dependence, or intercurrent illness that would
             affect the patient's ability to comply with study visits and procedures