The primary APS group also had low utilization of hydroxychloroquine, which has been studied as a successful adjunctive therapy to anticoagulation in small studies of adult primary APS patients [28, 29] in addition to recommendations for its use in all aPL-positive patients with lupus by the 14th International Congress APS Treatment Trends Taskforce [30]. The gene discussed is FASLG; the disease is systemic lupus erythematosus.