M7824 (MSB0011359C) in Combination With Gemcitabine in Adults With Previously Treated Advanced Adenocarcinoma of the Pancreas

Background: Pancreas cancer ranks 4th in all cancer-related deaths in the United States (U.S.) Gemcitabine is a standard treatment for it. M7824 (MSB0011359C) blocks a pathway that prevents the immune system from effectively fighting cancer. The two drugs together might help people with pancreas cancer. Objective: To test if giving M7824 together with gemcitabine is safe and causes tumors to shrink. Eligibility: People ages 18 and older with pancreatic cancer already treated with standard therapies Design: Participants will be screened with: Medical history Physical exam Scans in a machine that takes pictures of the body Blood, urine, and heart tests Some participants may have a tumor sample removed. Participants will get M7824 by intravenous (IV) once every 2 weeks. They will continue until their disease gets worse or they have unacceptable side effects. After the first dose, participants will also get gemcitabine by IV once weekly for 7 weeks. Then they will get it as follows for up to 6 months: Skip 1 week, get the drug once a week for 3 weeks, skip 1 week. Before treatment on the first day of each cycle, participants will repeat screening tests. They will also have: Optional tumor biopsies before and after 3 cycles of therapy Questions about their well-being and function Genetic testing of tissue and blood samples Participants will have a follow-up visit 4-5 weeks after they stop therapy. This includes a physical exam, blood and urine tests, and maybe a scan. If their disease does not get worse, they will be invited for scans every 12 weeks.