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ACP-001

Phase 2

Adult Growth Hormone Deficiency | Small molecule | Endocrine |Ascendis Pharma A/S|Trials Updated: Jul 8, 2026

ACP-001 development status

Highest phase Phase 2
Registered trials 1 across 1 sponsor since Sep 2013

ACP-001 target and mechanism

ModalitySmall molecule

Also known as ACP-001 (TransCon PEG hGH), ACP-001 (TransCon hGH)

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLED
Total Trials2
Total Enrollment90

FDA Designations

No designations recorded

ACP-001 clinical trials

ACP-001 · 2 trials · 2 indications

Phase 2 2
NCT01947907Safety, PK/PD (Pharmacokinetics/Pharmacodynamics) and Efficacy of ACP-001 Weekly Versus Daily hGH in Children With Growth Hormone Deficiency (GHD)Growth Hormone Deficiency (GHD)
COMPLETED53 Analytics
NCT01247675A Safety, Pharmacokinetic and Pharmacodynamic Study of ACP-001 (TransCon hGH) in Adults With Growth Hormone DeficiencyAdult Growth Hormone Deficiency
COMPLETED37 Analytics
PHASE2COMPLETED
Safety, PK/PD (Pharmacokinetics/Pharmacodynamics) and Efficacy of ACP-001 Weekly Versus Daily hGH in Children With Growth Hormone Deficiency (GHD)
Growth Hormone Deficiency (GHD)Unlock trial analytics
PHASE2COMPLETED
A Safety, Pharmacokinetic and Pharmacodynamic Study of ACP-001 (TransCon hGH) in Adults With Growth Hormone Deficiency
Adult Growth Hormone DeficiencyUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence of Anti-hGH Binding Antibody Formation
Visit 2 - Visit 5

Number of subjects with positive results for anti-hGH binding antibodies at two consecutive post-dose visits

Incidence of Anti-hGH Neutralizing Antibody Formation
Visit 2 - Visit 5

Number of subjects with positive results for anti-hGH neutralizing antibodies at two consecutive post-dose visits

Number of Subjects Reporting Local Tolerability Events (Assessed by the Patient and Investigator)
Start of study treatment through Visit 5 (Week 27)

Assessment of local tolerability was performed by examining injection sites (by the investigator during study visits) and on the basis of anamnestic data and records in the Patient Diary. Assessments included pain, redness, bruising, swelling, and itching. Every subject was counted only once within each symptom category.

Cmax of hGH
0 hours to 168 hours at Visit 3 (Week 13)

As part of the following endpoint: PK profile of serum hGH from ACP-001 treated patients compared between ACP-001 dose groups and to the pharmacokinetic (PK) profile of hGH from the daily rhGH groups during visit 1 and 3. Uncorrected Cmax (maximum value of concentration) values at Visit 3 (Week 13)

AUC0-168h of hGH
0 hours to 168 hours at Visit 3 (Week 13)

As part of the following endpoint: PK profile of serum hGH from ACP-001 treated patients compared between ACP-001 dose groups and to the PK profile of hGH from the daily rhGH group during Visit 1 and Visit 3 Uncorrected AUC0-168h (area under the curve from 0h to 168h) values at Visit 3 (Week 13)

E-Trough of IGF-1
0 hours to 168 hours at Visit 3 (Week 13)

As part of the following endpoint: PD profile of serum IGF-1 during Visit 1 and Visit 3 compared between the ACP-001 dose groups and to the daily rhGH group Uncorrected E-Trough (the pre-dose efficacy response) values at Week 13

Emax of IGF-1
0 hours to 168 hours at Visit 3 (Week 13)

As part of the following endpoint: PD profile of serum IGF-1 during V1 and V3 compared between the ACP-001 dose groups and to the daily rhGH group

AUEC0-168h of IGF-1
0 hours to 168 hours at Visit 3 (Week 13)

As part of the following endpoint: PD profile of serum IGF-1 during V1 and V3 compared between the ACP-001 dose groups and to the rhGH group. Uncorrected AUEC0-168 (area under the efficacy curve from 0h-168h) values at Week 13

Incidence of Treatment Emergent Anti-hGH Binding Antibody Formation
Start of study treatment through Day 42

Number of subjects with treatment emergent anti-hGH binding antibodies

Secondary Endpoints

Annualized Height Velocity
Baseline to 6 months (Visit 5)
Cmax of hGH
Days 22 to 29
Emax of IGF-I
Days 22 to 29
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
ACP-001, dose-level 1EXPERIMENTALOnce weekly subcutaneous injection of ACP-001
ACP-001, dose-level 2EXPERIMENTALOnce weekly subcutaneous injection of ACP-001
ACP-001, dose-level 3EXPERIMENTALOnce weekly subcutaneous injection of ACP-001
Human Growth HormoneACTIVE_COMPARATOROnce daily subcutaneous injection of human Growth Hormone (rhGH)
ACP-001, 0.02 mg hGH/kg/wkEXPERIMENTALOnce weekly subcutaneous injection of ACP-001 equivalent to 0.02 mg hGH/kg/week for 4 weeks
ACP-001, 0.04 mg hGH/kg/wkEXPERIMENTALOnce weekly subcutaneous injection of ACP-001 equivalent to 0.04 mg hGH/kg/week for 4 weeks
ACP-001, 0.08 mg hGH/kg/wkEXPERIMENTALOnce weekly subcutaneous injection of ACP-001 equivalent to 0.08 mg hGH/kg/week for 4 weeks
Omnitrope, 0.04 mg hGH/kg/wkACTIVE_COMPARATOROnce daily subcutaneous injection of human Growth Hormone (Omnitrope) equivalent to 0.04 mg hGH/kg/week for 4 weeks

Interventions

NameTypeDescription
ACP-001DRUGOnce weekly subcutaneous injection
Human Growth HormoneDRUGOnce daily subcutaneous injection of human Growth Hormone
ACP-001 (TransCon hGH)DRUGs.c., weekly injection
OmnitropeDRUGs.c., daily injection
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Eligibility Criteria

Age Range3 Years to 12 Years
SexALL
Healthy VolunteersNo
Study Sites36

Inclusion Criteria: * Prepubertal children, Tanner stage 1 * Diagnosis of GHD, confirmed by two stimulation tests * Bone age not greater than chronological age * Impaired height and height velocity * BMI within +/- 2 SD (standard deviations) * Baseline IGF-1 (insulin-like growth factor) * Normal fu...

Countries:BelarusBulgariaCzechiaEgyptFranceGermanyGreeceHungaryPolandRomaniaRussiaSloveniaTurkey (Türkiye)UkraineDenmarkItalySweden
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Recent Changes (Last 90 Days)

MEDIUMAug 8, 2026NCT01947907TRIAL_REMOVED: changed
MEDIUMAug 8, 2026NCT01247675TRIAL_REMOVED: changed
MEDIUMAug 8, 2026NCT01947907TRIAL_REMOVED: changed
MEDIUMAug 8, 2026NCT01247675TRIAL_REMOVED: changed
MEDIUMAug 8, 2026NCT01947907TRIAL_REMOVED: changed
MEDIUMAug 8, 2026NCT01247675TRIAL_REMOVED: changed
MEDIUMAug 8, 2026NCT01947907TRIAL_REMOVED: changed
MEDIUMAug 8, 2026NCT01247675TRIAL_REMOVED: changed

Frequently asked questions about ACP-001

What is ACP-001?

ACP-001 is an investigational long-acting human growth hormone therapy developed by Ascendis Pharma A/S for growth hormone deficiency. It is designed as a once-weekly treatment, in contrast to standard daily growth hormone injections. It has been studied in both children and adults with growth hormone deficiency.

What is ACP-001 used for in growth hormone deficiency?

ACP-001 is being developed to treat growth hormone deficiency in both children and adults. It is intended to replace daily human growth hormone injections with a once-weekly dosing schedule. The program has completed Phase 2 clinical testing in pediatric and adult growth hormone deficiency.

Who is developing ACP-001?

ACP-001 is being developed by Ascendis Pharma A/S, a biopharmaceutical company whose shares trade under the ticker ASND. Ascendis is responsible for the clinical development of the ACP-001 program in growth hormone deficiency.

What phase is ACP-001 in?

ACP-001 is in Phase 2 clinical development. It is an investigational therapy and has not been approved by the FDA. Two Phase 2 trials have been completed, one in children and one in adults with growth hormone deficiency.

What clinical trials is ACP-001 in?

ACP-001 has been evaluated in two completed Phase 2 trials. NCT01947907 compared weekly ACP-001 with daily human growth hormone in 53 children with growth hormone deficiency across multiple countries. NCT01247675 studied the safety, pharmacokinetics, and pharmacodynamics of ACP-001 in 37 adults with growth hormone deficiency in Europe.

Is ACP-001 the same as TransCon hGH?

Yes, ACP-001 is also known as TransCon PEG hGH and TransCon hGH. These names refer to the same investigational long-acting growth hormone product developed by Ascendis Pharma A/S. The TransCon designation reflects the company's sustained-release technology platform used in the product.