David Raubach sits down with Jillian Plochocki, Executive Director of the Proton Collaborative Group. Jillian explains how the world’s largest proton therapy registry was built and why real-world data from more than 40,000 patients is critical to improving cancer treatment outcomes.The conversation explores the difference between registries and clinical trials, how proton centers across the United States collaborate on research, and why long-term follow-up matters when evaluating radiation therapy.