Efficacy and Safety of Weekly Somatrogon vs Daily Somatropin in Children With Growth Hormone Deficiency: A Phase 3 Study

Cheri L. Deal, Joel Steelman, Elpis Vlachopapadopoulou, Renata Stawerska, Lawrence A. Silverman, Moshe Phillip, Ho Seong Kim, Cheol Woo Ko, Oleg Malievskiy, Jose F. Cara, Carl L. Roland, Carrie Turich Taylor, Srinivas Rao Valluri, Michael P. Wajnrajch, Aleksandra Pastrak, Bradley S. Miller

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27 Scopus citations


Context: Somatrogon is a long-acting recombinant human growth hormone (rhGH) in development for once-weekly treatment of children with growth hormone deficiency (GHD). Objective: We aimed to compare the efficacy and safety of once-weekly somatrogon with once-daily somatropin in prepubertal children with GHD. Methods: In this 12-month, open-label, randomized, active-controlled, parallel-group, phase 3 study, participants were randomized 1:1 to receive once-weekly somatrogon (0.66 mg/kg/week) or once-daily somatropin (0.24 mg/kg/week) for 12 months. A total of 228 prepubertal children (boys aged 3-11 years, girls aged 3-10 years) with GHD, impaired height and height velocity (HV), and no prior rhGH treatment were randomized and 224 received 1 dose of study treatment (somatrogon: 109; somatropin: 115). The primary endpoint was annualized HV at month 12. Results: HV at month 12 was 10.10 cm/year for somatrogon-treated subjects and 9.78 cm/year for somatropin-treated subjects, with a treatment difference (somatrogon-somatropin) of 0.33 (95% CI: -0.24, 0.89). The lower bound of the 2-sided 95% CI was higher than the prespecified noninferiority margin (-1.8 cm/year), demonstrating noninferiority of once-weekly somatrogon vs daily somatropin. HV at month 6 and change in height standard deviation score at months 6 and 12 were similar between both treatment groups. Both treatments were well tolerated, with a similar percentage of subjects experiencing mild to moderate treatment-emergent adverse events in both groups (somatrogon: 78.9%, somatropin: 79.1%). Conclusion: The efficacy of once-weekly somatrogon was noninferior to once-daily somatropin, with similar safety and tolerability profiles. (ClinicalTrials.gov no. NCT02968004).

Original languageEnglish (US)
Pages (from-to)E2717-E2728
JournalJournal of Clinical Endocrinology and Metabolism
Issue number7
StatePublished - Jul 1 2022

Bibliographical note

Publisher Copyright:
© 2022 The Author(s) 2022. Published by Oxford University Press on behalf of the Endocrine Society.


  • growth hormone
  • growth hormone deficiency
  • long-acting growth hormone
  • pediatric
  • somatrogon
  • somatropin


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