New Data from Week 52 of the Ongoing COACH Trial Showed that TransCon® hGH Accelerated TransCon® CNP’s Benefits Beyond Linear Growth in Children with Achondroplasia
Rhea-AI Summary
Ascendis Pharma (Nasdaq: ASND) reported Week 52 COACH Phase 2 data showing that once-weekly TransCon hGH added to once-weekly TransCon CNP accelerated benefits beyond linear growth in children with achondroplasia. Key results: arm span Z-score +1.02 (treatment-naïve) and +0.66 (treated); arm gains +9.4 cm and +7.9 cm. Spinal L1-L5 IPD changes +1.7 mm (naïve) and +1.1 mm (treated) vs +0.6 mm with monotherapy. Tibial femoral angle improved -3.0° (combination) vs -1.3° (monotherapy); TFA Z-score -0.86 vs -0.47. TransCon CNP (YUVIWEL) received FDA approval Feb 2026; TransCon hGH (SKYTROFA) is approved for GH deficiency but investigational in achondroplasia.
AI-generated analysis. Not financial advice.
Positive
- Arm span Z-score improvement of +1.02 in TransCon CNP treatment-naïve children
- Mean arm length gains of +9.4 cm (treatment-naïve) and +7.9 cm
- Spinal L1-L5 interpedicular distance increase of +1.7 mm with combination therapy
- Tibial femoral angle reduction of -3.0° indicating enhanced leg straightening
Negative
- Small COACH cohorts: N=12 treatment-naïve and N=9 previously treated
- Longer-term clinical impact remains unreported; the company says additional follow-up is needed
- TransCon hGH remains investigational for achondroplasia despite approval in other indications
News Market Reaction – ASND
On the day this news was published, ASND gained 5.77%, reflecting a notable positive market reaction. Our momentum scanner triggered 20 alerts that day, indicating elevated trading interest and price volatility. This price movement added approximately $834M to the company's valuation, bringing the market cap to $15.29B at that time.
Data tracked by StockTitan Argus on the day of publication.
Key Figures
Market Reality Check
Peers on Argus
ASND fell 2.74% while peers were mixed: EXEL (+0.09%), SMMT (+3.56%), BMRN (+0.14%), and IONS (-0.22%), BBIO (-0.18%). Moves do not show a unified sector trend.
Historical Context
| Date | Event | Sentiment | Move | Catalyst |
|---|---|---|---|---|
| Mar 17 | Clinical trial data | Positive | -1.3% | Phase 2 New InsiGHTS Week 52 data showed comparable efficacy to daily somatropin. |
| Mar 16 | Clinical trial data | Positive | +2.0% | Two-year ApproaCH data showed sustained growth and body proportionality benefits. |
| Mar 02 | Conference participation | Positive | +3.7% | Participation in TD Cowen healthcare conference via virtual fireside chat. |
| Feb 27 | FDA approval | Positive | +3.7% | FDA accelerated approval of once-weekly YUVIWEL for pediatric achondroplasia. |
| Feb 11 | Earnings update | Negative | -1.5% | Q4 and full-year 2025 results with revenue growth but a substantial net loss. |
Recent fundamentally positive R&D and regulatory news often aligned with positive price moves, with one notable divergence on favorable clinical data.
Over the last few months, Ascendis reported multiple positive catalysts, including FDA approval of YUVIWEL for achondroplasia on Feb 27, 2026 and strong two‑year ApproaCH data improving body proportionality through Week 104. Earlier, Q4 2025 results showed product revenue of €240 million and full‑year revenue of €684 million alongside a net loss. Additional Phase 2 data in Turner syndrome and conference participation rounded out the news flow. Today’s COACH Week 52 update extends this sequence of achondroplasia‑focused efficacy data beyond linear growth.
Market Pulse Summary
The stock moved +5.8% in the session following this news. A strong positive reaction aligns with the article’s focus on meaningful skeletal benefits beyond linear growth, including improvements in arm span, spinal canal dimensions, and leg alignment at Week 52. Historical data show that favorable achondroplasia and approval updates, such as YUVIWEL’s FDA decision, previously coincided with positive moves. Investors would still need to weigh execution on commercialization, evolving safety data, and broader biotechnology sentiment when assessing how durable such a reaction might be.
Key Terms
achondroplasia medical
interpedicular distance (IPD) medical
tibial femoral angle (TFA) medical
C-type natriuretic peptide (CNP) medical
prodrug medical
somatropin medical
Phase 2 medical
open-label technical
AI-generated analysis. Not financial advice.
- Unprecedented improvements in arm span observed with TransCon CNP and TransCon hGH combination therapy, a measure highly meaningful to the achondroplasia community
- Enhanced improvements in spinal canal dimensions observed with TransCon CNP and TransCon hGH combination therapy compared to TransCon CNP monotherapy
- For the TransCon CNP treatment-naïve cohort, the improvement in tibial femoral angle (TFA) indicated enhanced straightening of the legs
- Children treated with long-term TransCon CNP monotherapy maintained TFA in normal range in COACH
COPENHAGEN, Denmark, April 08, 2026 (GLOBE NEWSWIRE) -- Ascendis Pharma A/S (Nasdaq: ASND) today announced new data demonstrating TransCon hGH accelerated TransCon CNP’s benefits beyond linear growth with substantial improvements in arm span, spinal canal dimensions, and lower limb alignment. The new data are from Week 52 of the ongoing Phase 2 COACH Trial of combination therapy with once-weekly TransCon CNP and once-weekly TransCon hGH in children with achondroplasia. Ascendis previously reported Week 52 COACH results that demonstrated mean annualized growth velocity exceeding the 97th-percentile of average stature children, without compromising safety or tolerability and with no acceleration of bone age.
“It is encouraging to see data emerging beyond linear growth, including reported improvements in arm span, spinal dimensions, and leg alignment, which may help broaden how outcomes are understood,” said Michael Hughes, Chair of the Biotech Committee at the Little People of America. “Findings from the COACH Trial contribute to this expanding view and can be meaningful to consider as part of a more comprehensive understanding of treatment effects, alongside continued efforts to engage with the achondroplasia community. As research progresses, longer-term data will be important to understand how these outcomes may translate over time, including areas such as skeletal health, spinal complications, and the need for interventions.”
New Data from Week 52 of the COACH Trial
- Unprecedented improvements in arm span observed at Week 52 with TransCon CNP and TransCon hGH combination therapy, a measure highly meaningful to the achondroplasia community, with the mean change from baseline in achondroplasia (ACH)-specific arm span Z-scores at Week 52 for TransCon CNP treatment-naïve and TransCon CNP-treated children in COACH were +1.02 and +0.66, respectively. The TransCon CNP treatment-naïve cohort improved +9.4 cm and the TransCon CNP-treated cohort improved +7.9 cm. By comparison, humeral gain by limb lengthening surgery is approximately 8 cm per arm and carries a high complication risk.1
- Mean of L1-L5 average changes in interpedicular distance (IPD) for TransCon CNP treatment-naïve and TransCon CNP-treated children on combination therapy in COACH were +1.7 mm and +1.1 mm, respectively, compared to +0.6 mm for children on TransCon CNP monotherapy in ApproaCH. Improvements in IPD offer the potential to reduce nerve compression and pain that can result from a narrowed spinal column.
- For the TransCon CNP treatment-naïve cohort, the mean change in tibial femoral angle (TFA) Z-score was -0.86 with combination therapy at Week 52 in COACH and was -0.47 for TransCon CNP monotherapy at Week 52 in ApproaCH, indicating enhanced straightening of the legs. Children previously treated with long-term TransCon CNP monotherapy for an average of 2.56 years maintained in normal range for TFA Z-score.
- For the TransCon CNP treatment-naïve cohort, the mean change in TFA was -3.0 degrees with combination therapy in COACH and was -1.3 degrees for children on TransCon CNP monotherapy at Week 52 in ApproaCH. Children previously treated with long-term TransCon CNP monotherapy for an average of 2.56 years maintained TFA treatment benefit in the setting of accelerated growth.
- All children completed 52 weeks of treatment and remain on therapy in COACH as of today.
TransCon CNP (navepegritide) is a prodrug of C-type natriuretic peptide (CNP) administered once weekly, providing continuous exposure of active CNP to receptors on tissues throughout the body, including growth plates and skeletal muscle. TransCon hGH (lonapegsomatropin) is a prodrug of somatropin administered once weekly, providing sustained release of active, unmodified somatropin. TransCon CNP was approved under the trade name YUVIWEL® by the U.S. Food & Drug Administration (FDA) in February 2026 and is under review by the European Medicines Agency as a monotherapy for children with achondroplasia. TransCon hGH is approved by the FDA, European Commission, and other regulatory agencies and marketed as SKYTROFA® for the treatment of pediatric and adult growth hormone deficiency; it is investigational in achondroplasia and other indications.
COACH Trial Design
COACH is an ongoing prospective Phase 2 open-label trial to investigate the efficacy, safety, and tolerability of combined treatment with once-weekly TransCon CNP at 100 µg/kg/week and once-weekly TransCon hGH at a starting dose of 0.30 mg/kg/week in children with achondroplasia aged 2 to 11 years. The trial included a cohort of TransCon CNP treatment-naïve children (N=12, mean age 4.67 years) and a cohort of previously TransCon CNP-treated children (N=9, mean age 7.89 years), who had received TransCon CNP (100 µg/kg/week) for a mean of 2.56 years in clinical trials. The trial population is representative of children with achondroplasia and the prior treatment benefits of TransCon CNP monotherapy.
“These unprecedented COACH Trial results demonstrate benefits beyond linear growth, reflecting meaningful clinical improvements identified by the achondroplasia community,” said Aimee D. Shu, M.D., Executive Vice President of Endocrine & Rare Disease Medical Science and Chief Medical Officer at Ascendis Pharma. “Across clinical trials, TransCon CNP has demonstrated unique benefits as monotherapy and now we see potential in combination with TransCon hGH to enhance these transformative changes for individuals with achondroplasia.”
A slide presentation with these new COACH Trial Week 52 data can be found on the Investors & News section of the Ascendis Pharma website: https://investors.ascendispharma.com.
About Achondroplasia
Achondroplasia is a rare genetic condition arising from a systemic fibroblast growth factor receptor 3 (FGFR3) variant that leads to an imbalance in the effects of the FGFR3 and CNP signaling pathways, estimated to affect more than 250,000 people worldwide. While historically considered a bone growth disorder, the FGFR3 variant seen in achondroplasia is expressed in tissues throughout the body, and is associated with an increased risk of muscular, neurological, and cardiorespiratory complications in addition to skeletal dysplasia. Medical complications of achondroplasia can vary from individual to individual and across different stages of life. Throughout infancy and childhood, observed complications include spinal abnormalities, enlarged brain ventricles, impaired muscle strength and reduced stamina, hearing deficits and chronic ear infections, upper airway obstructions, sleep-disordered breathing, hip problems, leg bowing, and chronic pain; some of which persist or worsen in adulthood. These medical complications can affect physical well-being and quality of life, and may be impacted by a range of individual, clinical, and social factors. Some individuals with achondroplasia require multiple procedures and surgeries to address specific functional or anatomical concerns.
About Ascendis Pharma A/S
Ascendis Pharma is a global biopharmaceutical company focused on applying our innovative TransCon technology platform to make a meaningful difference for patients. Guided by our core values of Patients, Science, and Passion, and following our algorithm for product innovation, we apply TransCon to develop new therapies that demonstrate best-in-class potential to address unmet medical needs. Ascendis is headquartered in Copenhagen, Denmark, and has additional facilities in Europe and the United States. Please visit ascendispharma.com to learn more.
Forward-Looking Statements
This press release contains forward-looking statements that involve substantial risks and uncertainties. All statements, other than statements of historical facts, included in this press release regarding Ascendis’ future operations, plans and objectives of management are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Examples of such statements include, but are not limited to, statements relating to (i) the potential of TransCon CNP and TransCon hGH combination therapy as a differentiated therapy for short stature in the setting of growth hormone sufficiency, (ii) Ascendis’ ability to apply its TransCon technology platform to make a meaningful difference for patients, and (iii) Ascendis’ ability to apply TransCon to develop new therapies that demonstrate best-in-class potential to address unmet medical needs. Ascendis may not actually achieve the plans, carry out the intentions or meet the expectations or projections disclosed in the forward-looking statements and you should not place undue reliance on these forward-looking statements. Actual results or events could differ materially from the plans, intentions, expectations and projections disclosed in the forward-looking statements. Various important factors could cause actual results or events to differ materially from the forward-looking statements that Ascendis makes, including, without limitation: dependence on third‑party manufacturers, distributors, and service providers for Ascendis’ products and product candidates; risks related to regulatory review and approval, including the possibility of delays, requests for additional data or analyses, restrictions or limitations on use, approval with labeling that is more limited than expected, or failure to obtain approval in the United States, European Union, or other jurisdictions; clinical development risks, including that results from ongoing or future trials may not confirm earlier data; unforeseen safety or efficacy findings in development programs or on‑market products; manufacturing, supply chain, quality, or logistics issues that could delay development or commercialization; unforeseen expenses related to commercialization of any approved Ascendis products; unforeseen research and development or selling, general and administrative expenses and other costs impacting Ascendis’ business generally; market acceptance, pricing, and reimbursement challenges, including payer coverage decisions and health technology assessments; competitive developments, including new or improved therapies; intellectual property protection, freedom‑to‑operate, and litigation risks; Ascendis’ ability to obtain additional funding, if needed, to support its business activities; cybersecurity, data privacy, and information technology disruptions; and the impact of international economic, political, legal, compliance, public health, and business factors, including tariffs, trade policies, currency fluctuations, and geopolitical events. For a further description of the risks and uncertainties that could cause actual results to differ from those expressed in these forward-looking statements, as well as risks relating to Ascendis’ business in general, see Ascendis’ Annual Report on Form 20-F filed with the U.S. Securities and Exchange Commission (SEC) on February 11, 2026, and Ascendis’ other future reports filed with, or submitted to, the SEC. Forward-looking statements do not reflect the potential impact of any future licensing, collaborations, acquisitions, mergers, dispositions, joint ventures, or investments that Ascendis may enter into or make. Ascendis does not assume any obligation to update any forward-looking statements, except as required by law.
Ascendis, Ascendis Pharma, the Ascendis Pharma logo, TransCon, SKYTROFA, and YUVIWEL are trademarks owned by the Ascendis Pharma group. © April 2026 Ascendis Pharma A/S.
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1Hosny G, et al. International Orthopaedics. Published online March 16, 2026. doi: https://doi.org/10.1007/s00264-025-06720-z
