Children’s Oncology Group (COG), a project of Public Health Institute (PHI), is a National Cancer Institute (NCI) supported clinical trials cooperative group, and the world’s largest organization devoted exclusively to childhood and adolescent cancer research. Clinical research is conducted at more than 200 member institutions, which are leading children’s hospitals, universities, and cancer centers throughout the United States, Canada, Europe, Australia, and New Zealand. COG’s over 9,000 multi-disciplinary cancer researchers, affiliated with the network of member institutions, provide access to state-of-the-art therapies and the collective expertise of world-renowned pediatric specialists to children with cancer, regardless of where they live. Today, more than 90% of 14,000 children and adolescents diagnosed with cancer each year in the US are cared for at Children’s Oncology Group member institutions.