Daclizumab use in patients with pediatric multiple sclerosis.

BACKGROUND Daclizumab, a humanized monoclonal antibody specific for the interleukin 2 receptor α chain, reduces clinical and magnetic resonance imaging disease activity in patients with adult-onset multiple sclerosis (MS) as monotherapy or add-on therapy with interferon. OBJECTIVE To report the use of daclizumab in pediatric-onset MS. DESIGN Case series. SETTING Two comprehensive pediatric MS centers. PATIENTS Seven patients with pediatric-onset MS with clinical and magnetic resonance imaging disease activity despite first-line disease-modifying therapy. INTERVENTION Intravenous daclizumab, 1 mg/kg monthly. MAIN OUTCOME MEASURES Annualized relapse rates, Expanded Disability Status Scale scores, contrast-enhancing lesions, and adverse effects. RESULTS Treatment with daclizumab, primarily combined with interferon, was associated with reductions in annualized relapse rates and contrast-enhancing lesions and with reduction or stabilization of Expanded Disability Status Scale scores in each patient. However, 4 patients had relapses and new contrast-enhancing lesions during daclizumab treatment. No significant adverse effects occurred. CONCLUSION Daclizumab may be a safe and at least partially effective treatment option for patients with pediatric-onset MS with disease activity despite first-line disease-modifying therapy.