[Gene therapy for hemophilia].

Gene therapies for hemophilia A and B were approved in the US and EU in 2022. A single infusion of adeno-associated virus vector containing FVIII and FIX gene increases clotting factor levels within a few weeks. Around 90% of hemophilia patients treated with gene therapy no longer need clotting factor injections and show a reduced annual bleeding rate. Gene therapy vectors for hemophilia have strong liver tropism and use liver-specific promoters. This review discusses the history of hemophilia gene therapy, phase 3 trials, and unmet needs.