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Somatrogon

Phase 3

Undisclosed | Small molecule | Other |Opko Health Inc.|Trials Updated: Jul 20, 2025

Somatrogon development status

Highest phase Phase 3 (NCT02968004)
Phase scored for OPKPhase 1
Registered trials 10 across 2 sponsors since Oct 2010

Somatrogon target and mechanism

Molecular targetGHR
Target classAgonist
ModalitySmall molecule

Also known as MOD-4023

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLED
Total Trials7
Total Enrollment515

FDA Designations

No designations recorded

Somatrogon clinical trials

Somatrogon · 7 trials · 5 indications

Phase 3 2Phase 2 3Phase 1 2
NCT03874013Safety and Efficacy Study of MOD-4023 to Treat Children With Growth Hormone DeficiencyGrowth Hormone Deficiency
COMPLETED44 Analytics
NCT02968004Safety and Efficacy Phase 3 Study of Long-acting hGH (MOD-4023) in Growth Hormone Deficient ChildrenPediatric Growth Hormone Deficiency
COMPLETED224 Analytics
PHASE3COMPLETED
Safety and Efficacy Study of MOD-4023 to Treat Children With Growth Hormone Deficiency
Growth Hormone DeficiencyUnlock trial analytics
PHASE3COMPLETED
Safety and Efficacy Phase 3 Study of Long-acting hGH (MOD-4023) in Growth Hormone Deficient Children
Pediatric Growth Hormone DeficiencyUnlock trial analytics

Study Endpoints

Primary Endpoints

Annual Height Velocity (HV) After 12 Months
12 months

Annual Height Velocity in cm/year after 12 months of treatment.

Annual Height Velocity in Main Study Phase
52 weeks

Annual Height Velocity in cm. Annual Height Velocity at 12 months is based on the difference between the heights at 12 months and baseline.

Annual Height Velocity in OLE Phase
Up to 60 months

Annualized Height Velocity (cm/year) in OLE Phase

Annualized Height Velocity
8 years

A summary of the annualized HV at the end of each year for Periods III/IV (OLE Years 1 - 4) and V (PEN Years 1 - 5).

Delta Height SDS Every 12 Months
8 years

A summary of annual change in height SDS at the end of each year for Periods III/IV (OLE Years 1 - 4) and V (PEN Years 1 - 5). Height SDS (Standard Deviation Score) reflects how an individual's height compares to the average for their age and sex, calculated using Growth Analyzer and based on Switzerland 1989 (Prader) reference. A z-score of 0 indicates a height equal to the population mean, while positive scores indicate above-average heights and negative scores reflect below-average heights.

Annual Height Velocity
12 months of treatment

Annual Height Velocity in cm/year measured after 12 months of treatment

1. Safety and Tolerability
Following 4 weeks of MOD-4023 treatment

Adverse events (AE's), vital signs, electrocardiogram (ECG), laboratory tests, local reaction

Maintenance of normal Insulin-like-Growth-Factor-1 (IGF-1)levels in GHDA
Following 4 weeks MOD-4023 treatment

The primary efficacy endpoint will be the mean time interval of IGF-I levels that lay within ±1.5 SDS after the last dose administration during stage I (4w treatment) expressed in hours.

Area under the curve (AUC) of the serum concentration-time from time 0 to a specific time (AUCt)
30 days
Area under the curve (AUC) of the serum concentration-time from time 0 to infinity (AUC∞)
30 days
Serum concentration from of maximum concentration (Cmax) of somatrogon levels in serum
30 days
Composite safety and tolerability parameters as measured by adverse events, electrocardiograms (ECG), laboratory results, vital signs and injection site reactions
30 days

To assess the safety, tolerability and immunogenicity of MOD-4023 in healthy Caucasian and Japanese subjects after single subcutaneous (SC) dose.

Pharmacokinetics (PK) profile of MOD-4023 in healthy Caucasian and Japanese subjects after single SC dose
7 days

MOD-4023 serum levels (T1/2, Area-Under-the-Curve, Cmax, Tmax)

Secondary Endpoints

Height Velocity at 6 Months
6 months
Change in Height Standard Deviation Score (SDS) Compared to Baseline After 12 Months
12 months
Change in Bone Maturation (BM) After 12 Months
12 months
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Study Design & Arms

AllocationRANDOMIZED
MaskingSINGLE
ModelPARALLEL
PurposeOTHER

Treatment Arms

ArmTypeDescription
MOD-4023 Treatment ArmEXPERIMENTALMOD-4023 (investigational treatment): weekly MOD-4023 SC injections for 12 months; initially over the first 6 weeks, MOD-4023 will be administered in 3 stepwise escalating doses (0.25 mg/kg/week, 0.48 mg/kg/week and 0.66 mg/kg/week), each for two weeks sequentially. For the remaining 46 weeks, patients will continue to receive MOD-4023 at a dose of 0.66 mg/kg/week.
Genotropin Treatment ArmACTIVE_COMPARATORGenotropin® (reference treatment): daily Genotropin® (0.025 mg/kg/day).
MOD-4023EXPERIMENTALOnce weekly subcutaneous injection of long acting r-hGH (MOD-4023)
GenotropinACTIVE_COMPARATOROnce daily subcutaneous injection of somatropin (r-hGH; Genotropin)
MOD-4023 low doseEXPERIMENTALOnce weekly subcutaneous injection of long acting r-hGH (MOD-4023)
MOD-4023 middle doseEXPERIMENTALOnce weekly subcutaneous injection of long acting r-hGH (MOD-4023)
MOD-4023 high doseEXPERIMENTALOnce weekly subcutaneous injection of long acting r-hGH (MOD-4023)
Weekly low doseEXPERIMENTALMOD-4023
Weekly middle doseEXPERIMENTALMOD-4023
Weekly high doseEXPERIMENTALMOD-4023
Every-other week doseEXPERIMENTALMOD-4023
Somatrogon pre-filled PENEXPERIMENTAL -
Somatrogon frozen liquid formulationACTIVE_COMPARATOR -
Low doseEXPERIMENTAL7 Japanese and 7 Caucasian subjects (randomized 6:1) administered a single dose of MOD-4023/Placebo
Mid doseEXPERIMENTAL7 Japanese and 7 Caucasian subjects (randomized 6:1) administered a single dose of MOD-4023/Placebo
High doseEXPERIMENTAL7 Japanese and 7 Caucasian subjects (randomized 6:1) administered a single dose of MOD-4023/Placebo

Interventions

NameTypeDescription
MOD-4023DRUGMOD-4023 is a long-acting modified recombinant human growth hormone (r-hGH) which utilizes C-terminal peptide (CTP) technology. It will be provided as a solution for injection containing 20 or 50 mg/mL MOD-4023 in a multi-dose disposable pre-filled PEN. MOD-4023 will be administered as a SC injection once weekly, using a delivery device.
GenotropinDRUGGenotropin® is dispensed in a 2-chamber cartridge. The front compartment contains recombinant somatropin, glycine, mannitol, sodium dihydrogen phosphate anhydrous and disodium phosphate anhydrous. The rear compartment contains m-Cresol and mannitol in water for injections. A delivery device (Genotropin®) will be used for daily (evening/bedtime) SC administration of Genotropin® into the region of the upper arms, buttocks, thighs or abdomen (8 locations). Injection sites should be rotated. Dose regimen for Genotropin®: 0.025 mg/kg/day (or 0.175 mg/kg/w divided equally to 7 injections over a week).
SomatropinDRUGOnce daily subcutaneous injection of Genotropin using pre-filled pen device.
SomatrogonDRUGA single dose of 12 mg of somatrogon will be injected as one sc injection to the arm on each dosing day (Day 0 and Day 14).
PlaceboDRUG -
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Eligibility Criteria

Age Range3 Years to 11 Years
SexALL
Healthy VolunteersNo
Study Sites46

Inclusion Criteria: 1. Pre-pubertal child aged ≥ 3 years old, and not yet 10 years for girls (9 years and 364 days) or not yet 11 years for boys (10 years and 364 days), on the date of ICF signature, with either isolated GHD, or GH insufficiency as part of multiple pituitary hormone deficiency. 2. ...

Countries:JapanUnited StatesArgentinaAustraliaBelarusBulgariaCanadaColombiaGeorgiaGreeceIndiaIsraelMexicoNew ZealandPolandRussiaSouth KoreaSpainTaiwanUkraineUnited KingdomHungarySlovakiaCzechiaSerbiaSlovenia
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Frequently asked questions about Somatrogon

What is Somatrogon?

Somatrogon is an investigational small molecule developed by Opko Health Inc. (ticker OPK). It is a growth hormone receptor agonist that has been studied in a Phase 1 clinical trial in healthy male volunteers. The specific therapeutic indication for somatrogon has not been publicly disclosed.

What does Somatrogon target?

Somatrogon targets the growth hormone receptor (GHR) and acts as an agonist at that receptor. By binding and activating GHR, it is designed to stimulate growth hormone receptor signaling. This mechanism underlies its investigation as a growth hormone receptor agonist in clinical development.

Who makes Somatrogon?

Somatrogon is being developed by Opko Health Inc., which trades under the ticker symbol OPK. Opko Health sponsored the Phase 1 clinical study of somatrogon conducted in the United States. No other development partners are identified for this asset.

What phase is Somatrogon in?

Somatrogon is in Phase 1 clinical development. It is an investigational drug and is not approved by the FDA. One Phase 1 trial has been completed, and no active trials are currently listed for somatrogon.

What clinical trials is Somatrogon in?

Somatrogon has been evaluated in one completed Phase 1 trial, NCT03810664, titled a clinical study investigating the comparability of somatrogon in two different drug product presentations. The trial enrolled 49 healthy male volunteers aged 18 years and older in the United States and used an active-controlled, randomized design.