Delayed autoimmune hemolytic anemia in efalizumab-treated psoriasis

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Abstract

Efalizumab, a humanized anti-CD11a monoclonal antibody, has been shown to treat plaque psoriasis. A known association between this drug and autoimmune thrombocytopenia has already been established. More recently publicized, however, is efalizumab's ability to affect another cell line—that of the erythrocyte—and cause an autoimmune hemolytic anemia that typically occurs 4 to 6 months after initiating therapy. In this article, we report the case of a patient who developed autoimmune hemolytic anemia after 8 months of successful treatment with efalizumab. His delayed presentation suggests that monitoring of blood cell counts longer than 6 months may be warranted.

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