Isa Oboirien: Why Might Factor XI Inhibition Work Differently in Stroke and ACS?
Isa Oboirien, Higher Specialty Trainee at Health Education England, shared a post on LinkedIn:
“Why might Factor XI inhibition work differently in stroke and ACS?
The contrasting signals with factor XIa inhibition may reflect differences in thrombotic biology.
Recurrent coronary events after ACS are predominantly platelet-driven, arising from plaque rupture or erosion with intense platelet activation.
Contemporary PCI and potent dual antiplatelet therapy already target this pathway effectively, potentially leaving little residual coagulation-mediated risk for additional FXIa inhibition to modify.
Indeed, LIBREXIA-ACS showed no reduction in cardiovascular death, MI or ischaemic stroke with milvexian.
In contrast, recurrent ischaemic stroke is mechanistically heterogeneous, involving artery-to-artery thromboembolism, thrombin generation and fibrin-rich clot propagation, alongside platelet activation.
FXI may therefore contribute more importantly to thrombus amplification within cerebral circulation.
The encouraging symptomatic-stroke signal in AXIOMATIC-SSP and OCEANIC-STROKE trials, coupled with minimal intracranial bleeding, raises the intriguing possibility that FXIa inhibition may be better suited to cerebral than coronary thrombosis – a hypothesis that LIBREXIA-STROKE will ultimately test.”
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