Cyclosporin A Can Achieve Immune Tolerance In A Patient With Severe Haemophilia B And Refractory Inhibitors
HAEMOPHILIA(2007)
Abstract
Immune tolerance induction (ITI) is described in a patient with severe haemophilia B complicated by the presence of an inhibitor. A number of ITI regimes were attempted without success and the patient suffered from frequent relapses and bleeding episodes. Successful ITI was achieved with the additional use of cyclosporin A. The patient developed nephrotic syndrome although had a negative Bethesda titre at this time. When cyclosporin A therapy was ceased, the inhibitor titre rose and the patient suffered again from bleeding episodes. Cyclosporin A was reintroduced at a lower dose. The patient has now received cyclosporin A for 10 years, during which time he has relapsed three times for short periods (2 weeks). He is also on prophylaxis with factor IX three times a week with preinfusion levels > 1% and without bleeding.
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Key words
cyclosporin A, factor IX, haemophilia B, immune tolerance, inhibitor
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