The OnTRAC study investigates the outcomes of AYAs with CPS following their transition from pediatric to adult health care. The study aims to assess whether participants establish care with adult providers and adhere to recommended cancer surveillance protocols. Participants will complete a Readiness Assessment one month post-graduation and electronic Transition Outcomes Surveys at 1, 3, 5, and 8 years. These surveys will evaluate health care engagement, cancer screening adherence, barriers and facilitators to care, and psychosocial experiences. The study will also explore clinical and demographic correlates of successful transition and surveillance adherence.