FXI inhibitors include antisense oligonucleotides (ASOs) [18], monoclonal antibodies, aptamers and small molecules. Ionis-416858 is an ASO for fxi198 and is currently under clinical evaluation. Bms-986177 is a small molecule oral fxia inhibitor, which is well tolerated in phase I study and is currently in clinical phase II. Ab023 (xisomab) is a humanized 14e11, an antibody that binds to the apple 2 domain of FXI and inhibits the FXI activation mediated by FXIIa rather than the FXI activation mediated by thrombin. It is currently in clinical phase II.<br>(4) FXII inhibitor<br>FXII inhibitor is 3f7 [19], a completely humanized monoclonal antibody. The inhibition of 3f7 on thrombosis in ECMO model was the same as that of heparin. However, the role of FXII in human thrombosis needs further study<br>
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