With full phase II results in hand, MBX Biosciences Inc. backers are stacking the odds of parathyroid hormone (PTH) peptide prodrug canvuparatide (canvu) against Yorvipath (palopegteriparatide} from Ascendis Pharma A/S, a PTH analog cleared by the U.S. FDA in August 2024 for hypoparathyroidism (HP).
With three rare pediatric disease priority review vouchers (RPD PRVs) awarded just since the end of March, the nearly year-and-a-half lapse in the program’s reauthorization seems to have had little short-term impact. The three new vouchers bring the total RPD PRVs granted so far this year to seven – one more than the agency issued all last year and down two from the nine given in 2024.
Drug approvals by the U.S. FDA totaled 26 in the first two months of 2026, with eight approvals in January and 18 in February. Compared with 2025, when approvals reached 12 in January and 16 in February (28 total), early 2026 activity is consistent with historical ranges.
Ascendis Pharma A/S’ Yuviwel (navepegritide) gained U.S. FDA accelerated approval Feb. 27 for children 2 and older with the rare genetic bone growth disorder achondroplasia, also known as dwarfism, winning the company a rare pediatric disease priority review voucher
MBX Biosciences Inc. posted positive top-line phase II study data in treating chronic hypoparathyroidism, positioning itself to take on a U.S. FDA-approved therapy for the rare endocrine disease. MBX’s Avail study of canvuparatide hit its primary endpoint in treating adults, demonstrating statistical significance at week 12 and positive six-month results from the open-label extension study. MBX said it is poised to begin a phase III study of once-weekly canvuparatide next year.
A recent paper in the Journal of Clinical Medicine quantified some of the potential bodily ravages ahead for patients with hypoparathyroidism (hypoPT), specifically the loss of kidney function, with the risk of chronic kidney disease going up every year by 11%. A handful of drug developers continue to advance prospects in hypoPT, where Ascendis Pharma A/S’ hormone replacement therapy Yorvipath (palopegteriparatide) – the first and only treatment for adults with the rare endocrine disease – has set the bar for efficacy.
Septerna Inc.’s stock plunged as much as 68% throughout the day Feb. 18 on news that the company was stopping a phase I trial of SEP-786 in healthy volunteers following two severe events of elevated unconjugated bilirubin in the highest dose cohort of the multiple ascending-dose portion of the study.
The approval of Ascendis Pharma A/S’ hormone replacement therapy Yorvipath (palopegteriparatide) hypoparathyroidism – the first and only treatment for adults with the rare endocrine disease – did little to sate the market’s appetite for new drugs in the indication, where a number of players are busy in various stages of development.
Predictably, weekly vs. daily subcutaneous injections made a big difference in the achondroplasia space, where shares of Copenhagen, Denmark-based Ascendis Pharma A/S (NASDAQ:ASND) closed Sept. 16 at $139.57, up $20.35, or 17%, on favorable, pivotal top-line data with Transcon CNP (navepegritide), as competitor Biomarin Pharmaceutical Inc.’s stock (NASDAQ:BMRN) ended the day at $69.86, down $15.04, or 17.7%.
Visen Pharmaceuticals Co. Ltd.’s palopegteriparatide met both primary and secondary endpoints in the phase III Pathway trial conducted in China in adults with chronic hypoparathyroidism, according to top-line data. In the 26-week randomized, double-blind, placebo-controlled Pathway trial, 77.6% of patients treated with palopegteriparatide achieved the primary multicomponent endpoint compared to 0% for placebo.
