Background: Alemtuzumab is a humanized monoclonal antibody directed at CD52 approved as a disease-modifying therapy for relapsing forms of multiple sclerosis (MS).
Objective: To describe a case of a life-threatening autoimmune anemia occurring after a first course of alemtuzumab for relapsing-remitting MS in a 28-year-old male.
Methods: Case report.
Results: A 28-year-old male developed a life-threatening autoimmune anemia occurring 11 months after first alemtuzumab course.
Conclusion: We report the third case of autoimmune hemolytic anemia following treatment with alemtuzumab in a young MS patient. Due to the severity of this adverse event, neurologists using this treatment should be alert.
Keywords: Multiple sclerosis; alemtuzumab; hemolytic anemia.