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ACP-001

Phase 2

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

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLED
Total Trials1
Total Enrollment37

FDA Designations

No designations recorded

Clinical trial landscape

ACP-001 · 3 trials · 3 indications

Phase 2 2Phase 1 1
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

Safety and Tolerability (adverse events, local reactions, immunogenicity)
0-42 days
Pharmacokinetics; AUC and Cmax for hGH, TransCon-PEG hGH; and Pharmacodynamics measured by IGF-1 and IFG-BP
0-28 days

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
ACP-001, dose-level 4EXPERIMENTAL -

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
ACP-001 (TransCon PEG hGH)DRUGACP-001, dose-level 1, s.c., single-dose
PlaceboDRUGPlacebo, s.c., single-dose
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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)UkraineDenmarkItalySwedenCanada
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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 used for?

ACP-001 is an investigational small molecule being developed for growth hormone deficiency (GHD), including adult growth hormone deficiency. It has been studied in healthy volunteers and in children with growth hormone deficiency. The drug is in clinical development and is not approved by the FDA.

What does ACP-001 target?

ACP-001 is a long-acting growth hormone product, designed to provide sustained exposure to growth hormone. It is being studied for its pharmacokinetics, pharmacodynamics, safety, and efficacy in growth hormone deficiency. The drug is administered weekly, compared to daily human growth hormone.

Who makes ACP-001?

ACP-001 is being developed by Ascendis Pharma A/S, a biopharmaceutical company listed on the NASDAQ under the ticker ASND. The company is conducting clinical trials to evaluate the drug's safety and efficacy in growth hormone deficiency.

What phase is ACP-001 in?

ACP-001 has completed Phase 2 clinical trials. It has been studied in Phase 1 and Phase 2 trials, including a Phase 2 study in adults with growth hormone deficiency and a Phase 2 study in children with growth hormone deficiency. The drug is investigational and not yet approved.

What clinical trials is ACP-001 in?

ACP-001 has been studied in three completed clinical trials: NCT01010425, a Phase 1 study in healthy volunteers; NCT01247675, a Phase 2 study in adults with growth hormone deficiency; and NCT01947907, a Phase 2 study in children with growth hormone deficiency. All trials are completed.

Is ACP-001 the same as TransCon hGH?

ACP-001 is also known as TransCon hGH, as indicated in the clinical trial titles. The drug is a long-acting growth hormone formulation being developed for growth hormone deficiency. It is administered weekly and has been studied in both adult and pediatric populations.