Novel clinical algorithm for hypothalamic obesity in youth with brain tumours and factors associated with excess weight gain

Summary Background A standardized approach for identifying and treating hypothalamic obesity (HO) in children with hypothalamic tumours is lacking. Objectives To describe children with hypothalamic tumours at risk for obesity, assess outcomes of a novel HO clinical algorithm, and identify factors associated with weight gain. Methods Retrospective analysis of youth with hypothalamic and suprasellar tumours, seen at a paediatric tertiary care centre from 2010 to 2020. Results The study cohort (n = 130, 50% female, median age at diagnosis 5 [range 0–17]y) had a median duration of follow up of 5 (0.03–17)y. At last recorded body mass index (BMI) measurement, 34% had obesity, including 17% with severe obesity. Median onset of overweight and obesity after diagnosis was 6.2 (0.3–134) and 8.9 (0.7–65) months, respectively. After algorithm implementation (n = 13), the proportion that had an early dietitian visit (within 6 months) increased from 36% to 54%, (p = 0.498) and weight management referrals increased from 51% to 83% (p = 0.286). Higher BMI z‐score at diagnosis was associated with overweight and obesity development (p