Ultragenyx, Mereo Shares Dive As Brittle Bone Disease Drug Misses Early Win

Ultragenyx Pharmaceutical Inc. RARE and Mereo BioPharma Group plc MREO stocks are plunging on Thursday.What Happened?The companies on Wednesday announced that the randomized, placebo-controlled Phase 3 portion of the Orbit study evaluating UX143 (setrusumab) in pediatric and young adult patients with osteogenesis imperfecta (OI) is progressing toward a final analysis around the end of the year, consistent with the original plan.OI, also known as brittle bone disease, is a group of genetic disorders that mak ...