This Funding Opportunity Announcement (FOA) is associated with the Beau Biden Cancer MoonshotSM Initiative that is intended to accelerate cancer research. The purpose of this FOA is to establish centers of collaborating investigators with the goal of identifying and advancing research opportunities for translating immunotherapy concepts for children and adolescents with cancer toward clinical applications. Specifically, this FOA targets the following area designated as a scientific priority by the Blue Ribbon Panel (BRP): Recommendation (B) that calls for the establishment of a pediatric immunotherapy translational science network. The network was envisioned by the BRP as focusing on identifying new targets for immunotherapies, developing new pediatric immunotherapy treatment approaches (e.g., cancer vaccines, cellular therapy, combinations of immunotherapy agents, and others), and defining the biological mechanisms by which pediatric tumors evade the immune system. The Pediatric Immunotherapy Discovery and Development Network (PI-DDN) Centers will address and implement these BRP recommendations.