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TransCon hGH

Phase 3

Growth Hormone Deficiency, Pediatric | Small molecule | Endocrine |Ascendis Pharma A/S|Last Updated: Jul 7, 2026

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDDMC
Total Trials2
Total Enrollment444

FDA Designations

No designations recorded

Clinical trial landscape

TransCon hGH · 2 trials · 4 indications

Phase 3 2
NCT03344458A Long-Term Trial Investigating Safety and Efficacy of TransCon hGH in Children With Growth Hormone Deficiency Who Have Completed a Prior TransCon hGH Clinical TrialGrowth Hormone Deficiency, Pediatric
COMPLETED298 Analytics
NCT03305016A Safety, Tolerability and Efficacy Study of TransCon hGH in Children With Growth Hormone DeficiencyGrowth Hormone Deficiency, Pediatric
COMPLETED146 Analytics
PHASE3COMPLETED
A Long-Term Trial Investigating Safety and Efficacy of TransCon hGH in Children With Growth Hormone Deficiency Who Have Completed a Prior TransCon hGH Clinical Trial
Growth Hormone Deficiency, PediatricUnlock trial analytics
PHASE3COMPLETED
A Safety, Tolerability and Efficacy Study of TransCon hGH in Children With Growth Hormone Deficiency
Growth Hormone Deficiency, PediatricUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Subjects With Treatment-Emergent Adverse Events [Long-Term Safety and Tolerability]
Up to Week 208

Long-term safety and tolerability of weekly lonapegsomatropin (TransCon hGH) treatment

Number of Participants With Treatment-Emergent Adverse Events [Safety and Tolerability]
26 weeks

Safety and tolerability of weekly lonapegsomatropin (TransCon hGH) treatment

Secondary Endpoints

Annualized Height Velocity by Visit
Up to Week 208
IGF-1 SDS by Visit
Up to Week 208
Height SDS - Change From Baseline
Up to Week 208
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
TransCon hGHEXPERIMENTALOnce weekly subcutaneous injection of TransCon hGH

Interventions

NameTypeDescription
TransCon hGHDRUGOnce weekly subcutaneous injection of TransCon hGH
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Eligibility Criteria

Age Range1 Year to 18 Years
SexALL
Healthy VolunteersNo
Study Sites42

Inclusion Criteria: 1. Children who have completed a prior phase 3 TransCon hGH trial 2. Children who have not permanently discontinued study drug in the prior trial 3. Written, signed, informed consent of the parent or legal guardian of the subject and written assent of the subject as required by ...

Countries:United StatesArmeniaAustraliaBelarusBulgariaGeorgiaGreeceNew ZealandPolandRussiaUkraineCanada
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Recent Changes (Last 90 Days)

MEDIUMAug 7, 2026NCT03305016TRIAL_REMOVED: changed
MEDIUMAug 7, 2026NCT03344458TRIAL_REMOVED: changed
MEDIUMAug 7, 2026NCT03305016TRIAL_REMOVED: changed
MEDIUMAug 7, 2026NCT03344458TRIAL_REMOVED: changed
MEDIUMAug 7, 2026NCT03305016TRIAL_REMOVED: changed
MEDIUMAug 7, 2026NCT03344458TRIAL_REMOVED: changed

Frequently asked questions about TransCon hGH

What is TransCon hGH used for in pediatric growth hormone deficiency?

TransCon hGH is an investigational therapy for pediatric growth hormone deficiency, a condition where the pituitary gland does not produce enough growth hormone. It is designed to provide sustained exposure to growth hormone. The drug is currently in Phase 3 clinical development and is not yet approved by regulatory authorities.

How does TransCon hGH work?

TransCon hGH is a small molecule that works by providing a sustained release of human growth hormone. This mechanism aims to maintain therapeutic levels of growth hormone in the body over a longer period, potentially reducing the frequency of injections needed compared to daily growth hormone therapy. It is being studied specifically for use in children with growth hormone deficiency.

Who is developing TransCon hGH?

TransCon hGH is being developed by Ascendis Pharma A/S, a biopharmaceutical company listed on the NASDAQ under the ticker symbol ASND. The company is conducting clinical trials to evaluate the safety and efficacy of TransCon hGH in pediatric patients with growth hormone deficiency.

What phase is TransCon hGH in?

TransCon hGH is in Phase 3 clinical development. Two Phase 3 trials have been completed, with a total of 444 participants enrolled. The drug is still investigational and has not received FDA approval. Its safety and efficacy are being evaluated in children with growth hormone deficiency.

What clinical trials is TransCon hGH in?

TransCon hGH has been studied in two completed Phase 3 trials. NCT03305016 evaluated safety, tolerability, and efficacy in 146 children with growth hormone deficiency across the US, Australia, Canada, and New Zealand. NCT03344458 was a long-term extension trial enrolling 298 children who completed a prior TransCon hGH trial, conducted in multiple countries including the US and Europe.

Is TransCon hGH the same as other growth hormone treatments?

TransCon hGH is a specific investigational product developed by Ascendis Pharma. It is not known to be the same as other marketed growth hormone therapies. Its unique sustained-release formulation is designed to differentiate it from daily growth hormone injections, though it is still in clinical development and not yet approved.