NextCure announced preclinical data showing that NC605, their anti-Siglec-15 antibody, enhanced quality bone generation with improved mechanical properties in mice with Osteogenesis Imperfecta (OI). The study used NP159, a surrogate antibody to NC605, at 20 mg/kg dosage. Key results showed 90% of male and 80% of female treated mice had no fractures, compared to 85% and 55% in control groups. Both sexes demonstrated increased trabecular and cortical tissue mineral density. Male mice specifically showed increased trabecular bone volume and cortical thickness, resulting in improved mechanical bone strength.