Steven Pipe, MD, Professor of Pediatrics and Pathology, and Pediatric Medical Director of the Hemophilia and Coagulation Disorders Program at the University of Michigan, discusses the recent announcement of positive long-term results from the phase 3 HOPE-B clinical trial evaluating etranacogene dezaparvovec (EtranaDez), an investigational gene therapy for hemophilia B.

Hemophilia B is a congenital bleeding disorder due to dysfunction or deficiency of coagulation Factor IX (FIX). People with this condition may bleed for longer periods of time after injury or surgery. They are also susceptible to spontaneous bleeding in muscles, joints and organs, which can be extremely painful and, in some cases, life-threatening.

Etranacogene dezaparvovec is an investigational adeno-associated virus five (AAV5)-based gene therapy for people living with hemophilia B. 

The final data from the HOPE-B trial were recently announced and demonstrated that etranacogene dezaparvovec produced mean FIX activity of 39.0 IU/dL at six months and 36.9 IU/dL at 18 months post infusion. For context, patients with severe hemophilia B often have less than 1.0 IU/dL and greater than 10.0 IU/dL is thought to be necessary for an absence of joint bleeding. 

To learn more about hemophilia B and other rare hematological disorders, visit