Antibody
Platelet-activating anti-PF4 immunoglobulin
Antibodies against platelet factor 4 that can activate platelets
Hypotheses on this target 1
Lower level1
Protection from degradation
Synthesis suppression
Neutralisation
Accelerated excretion
Lower level1
Pre-existing antibodies may sustain platelet activation when estradiol treatment resumes
Where this hypothesis actsA rare susceptible menopausal subgroup with excess platelet activation after estradiol resumption
What is proposedEliminate pathogenic antibody activity by selectively depleting the antibodies
With whatRemoval from a body fluid
HowSelective immunoglobulin depletion or PF4-specific adsorption; test causality by adding back purified patient immunoglobulin
Possible resultExpected loss of excess platelet activation at fixed estradiol and PF4 concentrations
2026-10-03