Study of CRS-207, Pembrolizumab, Ipilimumab, and Tadalafil in Metastatic Pancreatic Cancer

Patients will receive treatment every 3 weeks for 6 cycles of treatment within a course (total of 18 weeks). Tadalafil (20 mg) will be administered orally every day on days 3-21 for cycles 1-6.

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.

Patients will receive treatment every 3 weeks for 6 cycles of treatment within a course (total of 18 weeks). Ipilimumab (50mg) will be administered IV on Day 1 of Cycles 1, 3, and 5.

Patients will receive treatment every 3 weeks for 6 cycles of treatment within a course (total of 18 weeks). CRS-207 \[1 × 10\^9 colony forming units (CFU) in 100ml NS\] will be administered IV on Day 2 of Cycles 1-6.