David Fajgenbaum was in his third year of medical school when he was diagnosed with a rare and life-threatening disease that began shutting down his organs, bringing him perilously close to death. Although he survived the initial episode, he faced four additional relapses, each pushing him to the brink of death. In this episode, we speak with David about his relentless journey to discover the treatment that ultimately put his disease into remission. We also explore how his personal battle inspired the creation of a groundbreaking approach to help others suffering from rare diseases.