Two phase III studies of setrusumab, Orbit and Cosmic, for treating brittle bones have failed and left the developers floundering on Wall Street. Neither of Ultragenyx Pharmaceutical Inc. and Mereo Biopharma Group plc’s studies of the monoclonal antibody in treating osteogenesis imperfecta hit statistical significance in their primary endpoints, though they did achieve their secondary endpoints. The companies are still looking at the numbers to determine their next steps.