Over the last several episodes, we've systematically broken down the evidence that defines modern GI oncology. Today, we put that knowledge to the test. This episode is a mock oral board examination. I will present five comprehensive case blocks, covering Esophageal, Gastric, Pancreatic, Hepatobiliary, and Hepatocellular cancers. For each, I will present a clinical scenario and then pose a series of questions designed to test your knowledge across all core competencies. Pause after each question to formulate your own structured response before I provide the model answer and a key teaching pearl. Let's begin.