TransCon PTH data at ENDO shows sustained calcium control for hypoparathyroidism patients. Early achondroplasia results also support once-monthly dosing thesis.
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Ascendis Pharma on Monday presented fresh data on its lead rare-disease programs at the Endocrine Society's annual meeting, a key event for hypoparathyroidism and growth hormone specialists. The company's slides, released before the session, highlighted new follow-up data on TransCon PTH for adults with the condition and early-stage findings on its TransCon CNP program for achondroplasia.
The TransCon PTH update covered patients through 12 months of treatment in a phase 3 trial. The data showed sustained maintenance of blood calcium levels without the need for active vitamin D or oral calcium supplements, the company said. That is the central value proposition for a drug that competes with Takeda's Natpara, a daily injection that carries a boxed warning for bone cancer risk.
What matters for the broader sector: hypoparathyroidism is a small but underserved market with no approved alternative to Natpara. A clean safety profile and durable efficacy on calcium levels would position TransCon PTH for a label that captures the roughly 80,000 U.S. patients, many of whom cycle on and off Natpara because of tolerability issues. The ENDO presentation is one of the last non-regulatory data updates before a likely FDA decision mid-2027.
On the achondroplasia front, Ascendis presented phase 1 data on TransCon CNP, a once-monthly C-type natriuretic peptide analog. The drug aims to compete with BioMarin's Voxzogo, which requires daily injections. Early results showed a growth velocity increase without the hypotension side effect that has plagued earlier CNP candidates. That is a read-through for the pediatric endocrinology space: any once-monthly growth therapy that matches or beats daily injections would reshape the standard of care.
Both programs are early – the TransCon PTH is the nearer-term catalyst – but the slide deck reinforced the company's broader thesis: its TransCon platform can deliver sustained drug concentrations from a single injection, making weekly or monthly dosing feasible for hormone-mimic therapies. Investors will focus next on the full phase 3 data set at a medical meeting later this year, then the regulatory filing.
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