Inclusion Criteria:

   - Age ≥18 years.

   - Have histologically- or cytologically-proven adenocarcinoma of the pancreas. Patients
   with mixed histology will be excluded.

   - Have metastatic disease.

   - Have failed only 1 prior chemotherapy regimen for metastatic pancreatic cancer.

   - Patients with the presence of at least one measurable lesion.

   - Patients acceptance to have a tumor biopsy of an accessible lesion at baseline and on
   treatment if the lesion can be biopsied with acceptable clinical risk (as judged by
   the investigator).

   - ECOG performance status 0 or 1.

   - Life expectancy of greater than 3 months.

   - Patients must have adequate organ and marrow function defined by study-specified
   laboratory tests.

   - Must use acceptable form of birth control while on study.

   - Ability to understand and willingness to sign a written informed consent document.

Exclusion Criteria:

   - known history or evidence of brain metastases.

   - Had surgery within the last 28 days

   - Have received any non-oncology vaccine therapy used for prevention of infectious
   diseases including seasonal vaccinations within 28 days of study treatment.

   - Prior treatment with anti-PD-1, anti-PD-L1, anti-PD-L2, anti-CTLA4, GVAX or CRS-207

   - Systemic steroids within the last 14 days

   - Use more than 3 g/day of acetaminophen.

   - Patients on immunosuppressive agents.

   - Patients receiving growth factors within the last 14 days

   - Known allergy to both penicillin and sulfa.

   - Severe hypersensitivity reaction to any monoclonal antibody.

   - Have artificial joints or implants that cannot be easily removed

   - Have any evidence of hepatic cirrhosis or clinical or radiographic ascites.

   - Have significant and/or malignant pleural effusion

   - Infection with HIV or hepatitis B or C at screening

   - Significant heart disease

   - Conditions, including alcohol or drug dependence, intercurrent illness, or lack of
   sufficient peripheral venous access, that would affect the patient's ability to comply
   with study visits and procedures

   - Unable to avoid intimate contact with another individual known to be at high risk of
   listeriosis (e.g., newborn infant, pregnant woman, HIV-positive individual) during the
   course of CRS-207 treatment until completion of antibiotic regimen.

   - Are pregnant or breastfeeding.

   - Have rapidly progressing disease