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Management of children with idiopathic short stature

Kuopio University and University Hospital, PO Box 1777, 70211 Kuopio, Finland

(Correspondence should be addressed to L Dunkel; Email: leo.dunkel{at}kuh.fi)

Abstract

The Food and Drug Administration (FDA) approved the use of biosynthetic GH for the treatment of children with idiopathic short stature (ISS) in the US in 2003. Primarily, the decision was based on two studies: a randomized placebo-controlled study and a dose–response study, both demonstrating an increase in adult height over the predicted height at baseline and over placebo-treated controls by an average of 4–7 cm. Despite these data and FDA approval of GH treatment for ISS, there is still a significant controversy among paediatric endocrinologists about how, and to what extent, GH should be used in this indication. GH is clearly efficacious in several growth disorders and has the potential to alleviate debilitating short stature. However, it has been questioned whether ISS should be considered a condition warranting pharmacological treatment, whether the degree of morbidity of untreated ISS is clinically significant, and whether improved psychosocial status or well-being is achieved through GH treatment and height gain. The benefits must outweigh treatment costs and risks to justify GH treatment in ISS. The safety of GH treatment in ISS has been the main subject in two recent articles from pharmaceutical companies that conducted the pioneering studies mentioned earlier. No new safety concerns were observed in the ISS populations, but there were some limitations in study designs that prevent clinicians, their patients and families from ‘resting assured’. Studies addressing these controversial issues are needed before the widespread use of GH treatment in ISS is warranted.