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MS relapse rate for children was 34% less for every extra 10 ng/ml of vit D

Vitamin D status is associated with relapse rate in pediatric-onset multiple sclerosis.

Annals Of Neurology 67(5):618-24 (2010) May;
profile Ellen M Mowry, profile Lauren B Krupp, profile Maria Milazzo, profile Dorothee Chabas, profile Jonathan B Strober, profile Anita L Belman, profile Jamie C McDonald, profile Jorge R Oksenberg, profile Peter Bacchetti and profile Emmanuelle Waubant
MS Center, Department of Neurology, University of California, San Francisco, San Francisco, CA 94117, USA. ellen.mowry at ucsf.edu PMID: 20437559
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OBJECTIVE: We sought to determine if vitamin D status, a risk factor for multiple sclerosis, is associated with the rate of subsequent clinical relapses in pediatric-onset multiple sclerosis.

METHODS: This is a retrospective study of patients with pediatric-onset multiple sclerosis or clinically isolated syndrome who were consecutively recruited into a prospective cohort at their clinical visit at the pediatric multiple sclerosis center of University of California, San Francisco or State University of New York at Stony Brook. Of 171 eligible patients, 134 (78%) with multiple sclerosis/clinically isolated syndrome were included in the cohort; a further 24 were excluded from this analysis due to lack of available serum (n = 7) or lack of follow-up (n = 17). Serum 25-hydroxyvitamin D(3) levels were measured and were adjusted to reflect a deseasonalized value. The adjusted serum 25-hydroxyvitamin D(3) level was the primary predictor in a multivariate negative binomial regression model in which the main outcome measure was the number of subsequent relapses.

RESULTS: Among the 110 subjects, the mean unadjusted 25-hydroxyvitamin D(3) level was 22 +/- 9 ng/ml. After adjustment for age, gender, race, ethnicity, disease duration, disease-modifying therapy, and length of follow-up, every 10 ng/ml increase in the adjusted 25-hydroxyvitamin D(3) level was associated with a 34% decrease in the rate of subsequent relapses (incidence rate ratio, 0.66; 95% confidence interval, 0.46-0.95; p = 0.024).

INTERPRETATION: Lower serum 25-hydroxyvitamin D(3) levels are associated with a substantially increased subsequent relapse rate in pediatric-onset multiple sclerosis or clinically isolated syndrome, providing rationale for a randomized controlled trial of vitamin D supplementation. DOI: 10.1002/ana.21972

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