国信证券：FXI抑制剂有望成为下一代抗凝药物 建议关注恒瑞医药

Group 1 - The global anticoagulant market exceeds $20 billion, with existing anticoagulants posing additional bleeding risks while preventing thrombosis. There is room for improvement in both efficacy and safety of these drugs [1] - FXI/FXIa inhibitors are expected to become safer alternatives to current anticoagulants, as they specifically target the intrinsic coagulation pathway, potentially reducing bleeding risks while maintaining anticoagulation efficacy [1] - No FXI/FXIa inhibitors have been approved yet, but various drug forms, including monoclonal antibodies and small molecules, are in clinical stages, with several candidates like Novartis' abelacimab and Bayer's asundexian undergoing registration trials [1] Group 2 - Bayer's asundexian has achieved superior efficacy in phase 3 clinical trials for secondary stroke prevention, marking it as the first FXI/FXIa inhibitor to meet key clinical endpoints [2] - FXI/FXIa inhibitors demonstrate significant safety advantages over DOACs, particularly in patients with high bleeding risks, suggesting a competitive edge in these populations [2] - FXI small nucleic acid drugs, still in early development, show promising early pharmacokinetic and pharmacodynamic data, indicating effective FXI activity suppression and potential for improved patient compliance with a quarterly injection schedule [3]