The endocrine phenotype induced by paediatric adrenocortical tumours is age- and sex-dependent.

Adrenocortical carcinomas are very rare malignancies in childhood associated with poor outcome in advanced disease. Most adrenocortical tumours (ACT) are functional causing signs and symptoms of adrenal hormone excess. In most studies, endocrine manifestations were reported 4-6 months prior to diagnosis. We seeked to extend our knowledge on endocrine manifestations with regard to age and sex to facilitate early diagnosis. We retrospectively analysed features of adrenal hormone excess in children and adolescents with ACT registered with the GPOH-MET studies between 1997 and 2022. Stage of puberty was defined as `prepubertal` in females <8 years of age and males <9 years. By December 2022, 155 patients (110 female, 45 male) with data on endocrine manifestations had been reported. Median age at ACT diagnosis was 4.2 years [0.1-17.8], median interval from first symptoms 4.2 months [0-90.7]. In 63 females of prepubertal age pubarche (68.3%), clitoral hypertrophy (49.2%), and weight gain (31.7%) were most frequently reported, in 47 pubertal female excessive pubic hair (46.8%), acne (36.2%), and hypertension (36.2%). Leading symptoms in 34 males of prepubertal age were pubarche (55.9%), penile growth (47.1%), and acne (32.4%) and in 11 pubertal males, weight gain (45.5%), hypertension (36.4%), excessive pubic hair (27.3%), and cushingoid appearance (27.3%). In pubertal patients, symptoms of androgen excess were mainly unrecognized as part of pubertal development while symptoms of Cushing's syndrome were more frequently apparent. The endocrine phenotype induced by paediatric ACT is age- and sex-dependent.

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