We conducted an economic evaluation of etranacogene dezaparvovec for the treatment of hemophilia B patients without inhibitors compared with prophylactic treatment. We also updated our economic evaluation of valoctocogene roxaparvovec for the treatment of hemophilia A patients without inhibitors compared with emicizumab. We reviewed the clinical effectiveness of etranacogene dezaparvovec compared with prophylaxis using factor IX preparations in adults eligible for factor prophylaxis. We updated our prior review of the clinical effectiveness of valoctocogene roxaparvovec in adults eligible for factor prophylaxis compared with both factor VIII prophylaxis and emicizumab. In ICER’s 2020 review, the evidence on the success rate, initial levels of factor achieved, and duration of benefit were limited because the valoctocogene roxaparvovec Phase 3 trial (GENEr8-1) data had only short follow-up data available for review. For both patient populations, we searched for evidence on patient-important outcomes including patient-reported quality of life, bleeding rates, treated bleeding events, pain, mental health status, and adverse events as well as factor activity levels which are important intermediate outcomes for gene therapy.
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