NCT03785210 2026-02-23Nivolumab (Anti-PD1), Tadalafil and Oral Vancomycin in People With Refractory Primary Hepatocellular Carcinoma or Liver Dominant Metastatic Cancer From Colorectal or Pancreatic CancersNational Institutes of Health Clinical Center (CC)Phase 2 Terminated22 enrolled 13 charts