JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
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Central precocious puberty following the diagnosis and treatment of paediatric cancer and central nervous system tumours: presentation and long-term outcomes.

OBJECTIVES: To estimate the prevalence of central precocious puberty (CPP) after treatment for tumours and malignancies involving the central nervous system (CNS) and examine repercussions on growth and pubertal outcomes.

DESIGN: Retrospective study of patients with tumours near and/or exposed to radiotherapy to the hypothalamus/pituitary axis (HPA).

PATIENTS AND MEASUREMENTS: Patients with CPP were evaluated at puberty onset, completion of GnRH agonist treatment (GnRHa) and last follow-up. Multivariable analysis was used to test associations between tumour location, sex, age at CPP, GnRHa duration and a diagnosis of CPP with final height <-2SD score (SDS), gonadotropin deficiency (LH/FSHD) and obesity, respectively.

RESULTS: Eighty patients (47 females) had CPP and were followed for 11·4 ± 5·0 years (mean ± SD). The prevalence of CPP was 15·2% overall, 29·2% following HPA tumours and 6·6% after radiotherapy for non-HPA tumours. Height <-2SDS was more common at the last follow-up than at the puberty onset (21·4% vs 2·4%, P = 0·005). Obesity was more prevalent at the last follow-up than at the completion of GnRHa or the puberty onset (37·7%, 22·6% and 20·8%, respectively, P = 0·03). Longer duration of GnRHa was associated with increased odds of final height <-2SDS (OR = 2·1, 95% CI 1·0-4·3) and longer follow-up with obesity (OR = 1·3, 95% CI 1·1-1·6). LH/FSHD was diagnosed in 32·6%. There was no independent association between CPP and final height <-2SDS, and LH/FSHD and obesity in the subset of patients with HPA low-grade gliomas.

CONCLUSIONS: Patients with organic CPP experience an incomplete recovery of growth and a high prevalence of LH/FSHD and obesity. Early diagnosis and treatment of CPP may limit further deterioration of final height prospects.

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