The gold standard for treatment of the antiphospholipid antibody syndrome (APS) after thrombosis remains high-intensity warfarin, and, in pregnancy, heparin and aspirin. Exciting developments include the potential role of hydroxychloroquine as a prophylactic drug, stem cell transplantation, and B-cell tolerance. Animal models appear to be a fruitful "proving ground" of new therapies. The introduction of revised classification criteria for APS should aid in appropriate characterization of, and selection of, patients for clinical trials.
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