RecruitingClinical trialMultisite Implementation of COMPRENDOCOMPRENDO (ChildhOod Malignancy Peer Research NavigatiOn) is a multi-site randomized clinical trial (RCT) that uses a Hybrid Type 1 design, to test the effects of a clinical intervention on patient-level outcomes, while exploring multilevel implementation factors that can inform real-world setting implementation. This study will test the impact of COMPRENDO, a peer-navigation intervention, vs. usual care on accrual to childhood cancer therapeutic clinical trials and parental informed consent outcomes. COMPRENDO will be delivered by trained peer navigators in 4 visits. A mixed methods (surveys, individual interviews) implementation evaluation will examine implementation factors that can inform the use of peer navigation in clinical practice, integrating data from clinicians, navigators, administrators, and parents pre and post the RCT.