辉瑞血友病药物出现患者死亡，公司回应

Core Viewpoint - Pfizer's stock dropped over 1% following the death of a patient involved in a long-term study of its hemophilia drug, Hympavzi, which was approved in the U.S. last year for treating hemophilia A or B patients aged 12 and older [3][4]. Group 1: Patient Incident - A patient participating in the study died from a stroke and intracranial hemorrhage on December 14 [4]. - Pfizer is actively gathering information in collaboration with trial researchers and an independent external data monitoring committee to understand the complexities surrounding the incident [4]. - The company stated that, based on current understanding and overall clinical data collected so far, the death is not expected to impact the safety of patients receiving the treatment [4]. Group 2: Drug Background - Hympavzi is a long-acting coagulation factor therapy administered weekly, aimed at preventing or reducing bleeding in hemophilia patients [4]. - In addition to Hympavzi, gene therapies have emerged as another treatment option for hemophilia in recent years [4]. Group 3: Previous Developments - Pfizer previously developed a one-time gene therapy, Beqvez, for treating adults with moderate to severe hemophilia B, which was approved in the U.S. [5]. - However, due to high costs and weak demand, Pfizer announced earlier this year that it would cease global development and commercialization of its hemophilia gene therapy [5].