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Effects of growth hormone treatment on adult height in severely short children with X-linked hypophosphatemic rickets

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Abstract

Background

We recently showed that a 3-year growth hormone (GH) treatment improves linear growth in severely short children with X-linked hypophosphatemic rickets (XLH). It is unknown if GH therapy increases adult height in XLH patients.

Methods

We carried out a follow-up analysis of a randomized controlled open-label GH study in short prepubertal children with XLH on phosphate and active vitamin D treatment. The changes in SD scores (SDS) of height, sitting height, leg and arm length, and sitting height index (i.e., the ratio between sitting height and height) were analyzed in 11 out of 16 patients followed-up until adult height.

Results

At baseline, XLH patients showed disproportionately short stature with reduced standardized height (−3.2 ± 0.6), sitting height (−1.7 ± 0.6), leg (−3.7 ± 0.7) and arm (−2.5 ± 0.8) length, and markedly elevated sitting height index (3.3 ± 0.6; each p < 0.01 versus healthy children). In GH-treated patients, adult height, sitting height, leg length, and arm length exceeded baseline values by 0.7 SDS, 1.7 SDS, 0.7 SDS, and 1.2 SDS respectively, although this was only significant for sitting height. In controls, no significant changes in linear body dimensions were noted. Adult height did not statistically differ between groups (−2.4 ± 0.7 vs −3.3 ± 1.2, p = 0.082). GH did not exaggerate body disproportion.

Conclusions

Growth hormone treatment did not significantly increase adult height in this group of short children with XLH, which may be at least partly due to the small number of patients included in our study.

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Acknowledgements

We very much appreciate the willingness of our patients and their families to participate in this trial. We thank all the members of the Hypophosphatemic Rickets Study Group of the “Deutsche Gesellschaft für Kinderendokrinologie und -diabetologie” (German Society for Pediatric Endocrinology and Diabetology) and the “Gesellschaft für Pädiatrische Nephrologie” (German Society for Pediatric Nephrology) for their help in the design and realization of this project. We especially thank E. Schmid (Kinderpraxen Hirschaid, Germany) and D. Wölfel (Children’s Hospital Göppingen, Germany, who recruited patients into this study. This project was supported by a research grant from Pfizer Pharma GmbH, who also provided Genotropin™ for treatment.

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Correspondence to Miroslav Živičnjak.

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The study received full approval from the Ethics Committee of the Charité Hospital, Berlin and each participating center. Assent and written informed consent for participation was obtained from all patients and/or their parents.

Conflicts of interest

DH has served as a consultant for Sandoz and has received honoraria and/or research support from Amgen Inc., Horizon Pharma, Kyowa Kirin, Merck Serono, Pfizer, and Sandoz. DS has served as a consultant for Sandoz and Novo Nordisk and has received honoraria from Kyowa Kirin, Alexion, Merck Serono, Pfizer, and Ipsen. OH has served as a consultant for Novo Nordisk and has received honoraria from Sandoz, Ipsen, Merck Serono, and Ultragenyx. MŽ, NM, HS, EW, MM, RB, UQ, MH, HB, WR, CS, JB, and AR declare that they have no conflicts of interest to declare.

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Meyerhoff, N., Haffner, D., Staude, H. et al. Effects of growth hormone treatment on adult height in severely short children with X-linked hypophosphatemic rickets. Pediatr Nephrol 33, 447–456 (2018). https://doi.org/10.1007/s00467-017-3820-3

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  • DOI: https://doi.org/10.1007/s00467-017-3820-3

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