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TransCon CNP

Phase 2FDA approved

Achondroplasia | Small molecule | Rare Disease |Ascendis Pharma A/S|Trials Updated: Aug 17, 2026

TransCon CNP development status

FDA approval on record Feb 27, 2026
Highest phase Phase 2
Registered trials 3 across 2 sponsors since Sep 2019

TransCon CNP target and mechanism

Molecular targetCNP
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials2
Total Enrollment197

FDA Designations

PRIORITY_REVIEW

TransCon CNP clinical trials

TransCon CNP · 2 trials · 1 indication

Phase 2 2
NCT05929807A Clinical Trial to Investigate Long-term Safety, Tolerability, and Efficacy of Weekly Subcutaneous Doses With TransCon CNP in Children and Adolescents With AchondroplasiaAchondroplasia
ENROLLING BY_INVITATION140 Analytics
NCT04085523A Dose Escalation Trial Evaluating Safety, Efficacy, and Pharmacokinetics of TransCon CNP Administered Once Weekly in Prepubertal Children With AchondroplasiaAchondroplasia
COMPLETED57 Analytics
PHASE2ENROLLING BY_INVITATION
A Clinical Trial to Investigate Long-term Safety, Tolerability, and Efficacy of Weekly Subcutaneous Doses With TransCon CNP in Children and Adolescents With Achondroplasia
AchondroplasiaUnlock trial analytics
PHASE2COMPLETED
A Dose Escalation Trial Evaluating Safety, Efficacy, and Pharmacokinetics of TransCon CNP Administered Once Weekly in Prepubertal Children With Achondroplasia
AchondroplasiaUnlock trial analytics

Study Endpoints

Primary Endpoints

Safety and Tolerability
Through trial completion, an average of 10 years

Incidence of Treatment-Emergent Adverse Events

Height Z-scores
Through trial completion, an average of 10 years

Number of standard deviations

Annualized Height Velocity (cm/Year) After 52 Weeks of Double-blind Treatment
52 weeks

The primary efficacy analysis compared the difference in the primary efficacy endpoint between the TransCon CNP treatment group and the pooled placebo group using an ANCOVA model with the annualized height velocity (AHV) at Week 52 as the response variable, treatment (dose groups and placebo) and sex as factors, baseline age and baseline height SDS as the covariates, and based on the Full Analysis Set.

Secondary Endpoints

Annualized Growth Velocity
Through trial completion, an average of 10 years
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
TransCon CNP 100 mcgEXPERIMENTALTransCon CNP 100 mcg delivered once weekly by subcutaneous injection
TransCon CNP 6 mcgEXPERIMENTALTransCon CNP 6 mcg CNP/kg delivered once weekly by subcutaneous injection.
TransCon CNP 20 mcgEXPERIMENTALTransCon CNP 20 mcg CNP/kg delivered once weekly by subcutaneous injection.
TransCon CNP 50 mcgEXPERIMENTALTransCon CNP 50 mcg CNP/kg delivered once weekly by subcutaneous injection.
PlaceboPLACEBO_COMPARATORPlacebo mimicking 6, 20, 50, or 100 mcg CNP/kg delivered once weekly by subcutaneous injection.
Open-Label Extension Period: TransCon CNPEXPERIMENTALParticipants who completed the 52-week blinded treatment period continued into the 104-week open-label extension period and received treatment with TransCon CNP (navepegritide) doses escalated up to a maximum of 100 mcg/kg delivered once weekly by subcutaneous injection.

Interventions

NameTypeDescription
TransCon CNPDRUGTransCon CNP drug product is a lyophilized powder in a single-use vial. Prior to use, the lyophilized powder is reconstituted with sterile water for injection and administered by subcutaneous injection via syringe and needle.
Placebo for TransCon CNPDRUGWeekly subcutaneously injection of placebo.
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Eligibility Criteria

Age Range3 Years to 15 Years
SexALL
Healthy VolunteersNo
Study Sites19

Inclusion Criteria: * Written, signed informed consent of the parent(s) or legal guardian(s) of the participant, and as required by the institutional review board/human research ethics committee/independent ethics committee (IRB/HREC/IEC). For participants who are below the age of consent, a writte...

Countries:United StatesAustraliaAustriaCanadaDenmarkFranceGermanyIrelandNew ZealandPortugalSpainUnited Kingdom
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Recent Changes (Last 90 Days)

LOWAug 17, 2026NCT05929807lastUpdatePostDate: changed
LOWAug 17, 2026NCT05929807lastUpdatePostDate: changed
LOWAug 14, 2026NCT05929807lastUpdatePostDate: changed
LOWAug 14, 2026NCT05929807lastUpdatePostDate: changed
LOWAug 14, 2026NCT05929807lastUpdatePostDate: changed
MEDIUMAug 2, 2026NCT04085523TRIAL_REMOVED: changed
MEDIUMAug 2, 2026NCT04085523TRIAL_REMOVED: changed
MEDIUMAug 2, 2026NCT04085523TRIAL_REMOVED: changed
MEDIUMAug 2, 2026NCT04085523TRIAL_REMOVED: changed

Frequently asked questions about TransCon CNP

What is TransCon CNP used for in achondroplasia?

TransCon CNP is an investigational small molecule being developed for achondroplasia, a rare genetic condition affecting bone growth. It is administered as a weekly subcutaneous injection and is currently in Phase 2 clinical development. TransCon CNP is designed to address the underlying growth deficiency in children and adolescents with achondroplasia.

What does TransCon CNP target?

TransCon CNP targets CNP, which stands for C-type natriuretic peptide. By targeting CNP, TransCon CNP aims to modulate the signaling pathway involved in bone growth. This mechanism is being studied as a potential treatment for achondroplasia, with the goal of improving growth outcomes in affected children and adolescents.

Who makes TransCon CNP?

TransCon CNP is being developed by Ascendis Pharma A/S, a biopharmaceutical company listed on the NASDAQ under the ticker symbol ASND. Ascendis Pharma is conducting clinical trials to evaluate the safety and efficacy of TransCon CNP for the treatment of achondroplasia in pediatric patients.

What phase is TransCon CNP in?

TransCon CNP is currently in Phase 2 clinical development. It is an investigational drug and has not been approved by regulatory authorities. The ongoing Phase 2 trials are designed to assess the long-term safety, tolerability, and efficacy of weekly subcutaneous doses of TransCon CNP in children and adolescents with achondroplasia.

What clinical trials is TransCon CNP in?

TransCon CNP is being evaluated in two Phase 2 clinical trials. The first, NCT05929807, is an ongoing study enrolling by invitation with 140 participants, investigating long-term safety and efficacy in children and adolescents with achondroplasia. The second, NCT04085523, is a completed dose escalation trial with 57 participants in prepubertal children with achondroplasia.

Is TransCon CNP the same as CNP?

TransCon CNP is not the same as CNP. CNP, or C-type natriuretic peptide, is the molecular target of TransCon CNP. TransCon CNP is a prodrug designed to provide sustained exposure to CNP, which is being studied for its potential to improve growth in children with achondroplasia.