David Fajgenbaum was in medical school when everything in his life suddenly shifted.
What began as fatigue and strange, unexplained symptoms quickly escalated into something far more serious. He found himself repeatedly hospitalized, undergoing test after test, with no clear explanation for what was happening to his body.
Doctors eventually delivered a diagnosis that changed everything: Castleman disease—a rare and potentially life-threatening disorder with very limited treatment options and no guaranteed path to recovery. For most people, this kind of news brings a pause in life. A waiting period. A reliance on medicine, hope, and uncertainty. But for David, something different happened. Even while lying in a hospital bed, he made a decision that would define everything that came after. If answers didn’t exist yet… he would search for them himself.
He began studying medical literature with intense focus, going through research papers, clinical data, and experimental findings. What started as survival instinct slowly became something deeper—a determined search for anything that might change his outcome.
Then, during one of those endless cycles of research, he found a possibility. An existing medication—already approved for other conditions—had shown potential relevance to his disease. It wasn’t widely recognized for Castleman disease. It wasn’t a standard treatment. But it was there, hidden in the margins of scientific data. He pushed for it. He advocated for its use. And eventually, under medical supervision, he was given the chance to try it. It worked. His condition stabilized. The progression of the disease slowed. And slowly, he began to reclaim the life that once felt like it was slipping away. But what makes his story truly remarkable is what came next. He didn’t return to life as it was before. He transformed it. David dedicated his career to researching rare diseases, building initiatives aimed at finding treatments for conditions that are often overlooked and underfunded. His experience as both patient and scientist became the foundation of his mission. Because he understood something deeply personal and powerful: Sometimes, the person searching for the cure… becomes the reason it’s found. ✨