This prospective, single-group interventional study evaluates endocrine and metabolic late effects in survivors of primary brain tumors treated during childhood. According to the study protocol, participants were prospectively assigned to undergo the Study-Specific Endocrine and Metabolic Late-Effects Assessment. The assessment included anthropometric measurements, repeated blood pressure measurements, clinical endocrine evaluation, fasting laboratory testing, and protocol-defined bone and vascular assessments. The purpose of the study was to identify the frequency and severity of endocrine and metabolic late effects and to evaluate their associations with tumor characteristics, previous cancer treatment, age at diagnosis, and physical functioning.