Mereo BioPharma is a biopharmaceutical company that develops innovative therapeutics for rare diseases and oncology. The company's lead programs include setrusumab (UX143), designed for treating osteogenesis imperfecta (OI) and alvelestat for treating severe alpha-1 antitrypsin deficiency-associated lung disease (AATD-LD).
Setrusumab, developed in partnership with Ultragenyx Pharmaceutical, was being evaluated in two Phase III studies as of October 2024—the Orbit study in patients aged five to 25 years and the Cosmic study in patients aged two to seven years. Recent Phase II data showed that setrusumab treatment resulted in a 67% reduction in annualized fracture rates after a mean treatment duration of 16 months. The drug also demonstrated significant improvements in bone mineral density.
For alvelestat, Mereo aligned with the FDA and EMA on the primary endpoints for a pivotal Phase III study in AATD-LD. As of October 2024, the company was preparing regulatory submissions to ensure the program was Phase III-ready. Alvelestat has received US Orphan Drug Designation and Fast Track designation.
In addition to its rare disease programs, Mereo has two oncology candidates: etigilimab (anti-TIGIT) and navicixizumab. Etigilimab has completed a Phase I billion/II basket study in combination with an anti-PD-1 across various tumor types. Navicixizumab, for late-line ovarian cancer, has been partnered with Feng Biosciences.
Key customers and partnerships
Mereo has established key partnerships to advance its pipeline. The company's collaboration with Ultragenyx Pharmaceutical iInitiated in December 2020) for setrusumab includes potential milestone payments and royalties on commercial sales in Ultragenyx territories. Mereo has retained commercial rights in the EU and the UK.
Mereo partnered with Feng Biosciences in Q4 2023 for the global development and commercialization of navicixizumab, which includes milestone payments and royalties. The company also entered an exclusive global license agreement with ReproNovo SA in December 2023 for leflutrozole, a non-steroidal aromatase inhibitor.
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