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Ann Pediatr Endocrinol Metab > Volume 7(1); 2002 > Article
The Clinical Characteristics of Children with Organic Growth Hormone Deficiency from Brain Tumors.
Eun Gyong Yoo, Duk Hee Kim
Abstract
PURPOSE
This study is designed to find out the clinical characteristics, growth status, and response to growth hormone treatment in children with organic growth hormone deficiency(GHD) after treatment of brain tumors. METHODS: Fifty-three children with organic GHD were evaluated for pituitary function, serum insulin-like growth factor-1(IGF-1), and insulin-like growth factor binding protein-3(IGFBP-3) concentrations. We also observed their growth status and corresponding change with or without growth hormone treatment.
RESULTS
The causes of organic GHD were craniopharyngioma(47%), germinoma (19%), and medulloblastoma(17%), and 18 children(35%), diagnosed with brain tumors, presented with symptoms suggesting hormonal deficit. Initial height was -2.5+/-.2 SDS in craniopharyngioma, -1.7+/-.1 SDS in germinoma, and -2.1+/-.6 SDS in medulloblastoma, and children with craniopharyngioma showed the highest obesity rate, at 21.4+/-9.3%. After treatment for brain tumors, children with craniopharyngioma had the lowest values of peak GH, IGF-1, and IGFBP-3 concentrations, which were 1.1+/-.3 ng/mL, 74.1+/-6.6 ng/mL(-1.7+/-.2 SDS), and 1.9+/-.0 mg/L(-2.0+/-.1 SDS) respectively. The numbers of deficient hormones increased from 2.4+/-.1 to 3.2+/-.2 after treatment of brain tumors(P<0.05). Nine children showed normal or accelerated growth velocity(growth velocity 7.0+/-.8 cm/yr) without GH replacement and they had higher body mass index(BMI), IGF-1 concentrations, and IGFBP-3 SDS(P<0.05) compared to the others(growth velocity 1.9+/-.9 cm/yr). Height SDS increased every year during the first three years of GH treatment(P<0.05), 0.5+/-.4 SDS(n=20) for the first year, 0.4+/-.4 SDS(n=14) for the second, and 0.3+/-.5 SDS(n=11) for the third, and it increased by 1.1+/-.9 SDS(n=11) in total.
CONCLUSION
The numbers of deficient pituitary hormones were increased after operation, irradiation, and/or chemotherapy. Children with GHD showed good response to GH replacement. Some children grew normally in spite of growth hormone deficiency, and their BMI, serum levels of IGF-1 and IGFBP-3 SDS were increased compared to those of the decreased growth group. This study suggests that further studies are needed to determine the mechanism of growth with low GH concentrations.
Keywords: Brain tumor;Growth hormone deficiency;Growth;Insulin like growth factor-1;Insulin like growth factor binding protein-3


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