Pfizer Exits Hemophilia B Gene Therapy Market Pfizer has announced the discontinuation of its gene therapy, fidanacogene elaparvovec (Beqvez), for hemophilia B. Despite being FDA-approved, the decision reflects challenges in the gene therapy market, where uptake for non-oncology treatments remains slow. This move underscores the complexities of commercializing advanced therapies in niche medical fields.1