International Oncology Network

International Oncology Network (ION), now operating as ION Solutions, is the largest physician-led oncology group purchasing organization (GPO) in the United States. As a subsidiary of Cencora (formerly AmerisourceBergen), ION provides community-based oncology practices with essential resources including pharmaceutical contracting, practice management tools, and clinical trial support. The organization is dedicated to supporting the independence of community oncologists and ensuring patient access to high-quality cancer care. ION also facilitates the collection of real-world evidence and data analytics to help pharmaceutical manufacturers optimize therapy delivery. By leveraging its extensive network of over 3,500 physicians, ION plays a critical role in the oncology supply chain and clinical research landscape.