OBJECTIVE: To report the use of natalizumab in pediatric MS. Natalizumab, a humanized monoclonal antibody targeting α4 integrin, is effective against active relapsing-remitting MS in adults.
DESIGN: Retrospective study.
SETTING: Eleven centers for neurology and pediatric neurology in Germany and Austria.
PARTICIPANTS: A total of 20 pediatric patients with MS who started treatment with natalizumab prior to 18 years of age. These patients underwent magnetic resonance imaging as clinically indicated, despite the fact that 19 of these 20 patients were undergoing first-line disease-modifying therapy. The mean (SD) age at initiation of natalizumab therapy was 16.7 (1.1) years, and the mean (SD) pretreatment period was 18 (10) months.
INTERVENTION: Natalizumab, 300 mg every 4 weeks.
MAIN OUTCOME MEASURES: Annualized relapse rates, Expanded Disability Status Scale scores, number of new T2/fluid-attenuated inversion recovery lesions and contrast-enhancing lesions on magnetic resonance imaging, number of adverse events, the prevalence of neutralizing antibodies against natalizumab, and serum JC virus-antibody status.
RESULTS: Treatment with natalizumab was associated with reductions in mean annualized relapse rates (3.7 without treatment vs 0.4 with treatment; P<0.001), median Expanded Disability Status Scale scores (2 without treatment vs 1 with treatment; P < 0.02), and mean number of new T2/fluid-attenuated inversion recovery lesions per year (7.8 without treatment vs 0.5 with treatment; P < 0.001). Two patients developed high-titre neutralizing antibodies against natalizumab and had to stop therapy. Adverse events included headaches, asthenia, infections, and hypersensitivity. Abnormal laboratory results were found for 8 patients. JC virus antibodies were found in 5 of 13 patients. After the discontinuation of natalizumab therapy, relapse activity occurred in 6 of 8 patients within 6 months.
CONCLUSIONS AND RELEVANCE: Our data indicate that natalizumab may be safe and effective against MS in paediatric patients with breakthrough disease.
"I tend not to comment on the clinical posts but as essentially identical data was published last week, I repost the response of prof G. "This study is very good news for anxious parents of children with active MS. Natalizumab works as well in children as it does in adults. We must assume the risks are the same, i.e. the PML risk."