Epacadostat, Pembrolizumab, and CRS-207, With or Without CY/GVAX Pancreas in Patients With Metastatic Pancreas Cancer

Patients will receive treatment every 3 weeks for 6 cycles of treatment within a course (total of 18 weeks). Epacadostat (100, 300, or 600 mg) is taken by mouth twice a day, every day.

Patients will receive treatment every 3 weeks for 6 cycles of treatment within a course (total of 18 weeks). Pembrolizumab (200 mg) will be administered IV on day 1 of Cycles 1-6.

CRS-207: Patients will receive treatment every 3 weeks for 6 cycles of treatment within a course (total of 18 weeks). CRS-207 (1 × 10\^9 CFU) will be administered IV on Day 2 of Cycles 3-6.

Patients will receive treatment every 3 weeks for 6 cycles of treatment within a course (total of 18 weeks). Cyclophosphamide (200 mg/m\^2) will be administered IV on day 1 of Cycles 1 and 2.

Patients will receive treatment every 3 weeks for 6 cycles of treatment within a course (total of 18 weeks). GVAX will be administered on Day 2 of Cycles 1 and 2.