Roche announced  today interim results from the phase III HAVEN 2 study evaluating emicizumab prophylaxis in children less than 12 years of age with haemophilia A and inhibitors to factor VIII. At this interim analysis after a median of 12 weeks of treatment, emicizumab prophylaxis showed a clinically meaningful reduction in the number of bleeds over time. These findings are consistent with results from the phase III HAVEN 1 study in adults and adolescents (12 years of age or older) with haemophilia A and inhibitors to factor VIII, in which emicizumab prophylaxis showed a statistically significant and clinically meaningful reduction in the number of bleeds over time compared to no prophylaxis, as well as compared to prior prophylaxis with bypassing agents. The most common adverse events with emicizumab in the HAVEN2 study were injection site reactions and nasopharyngitis.