Eculizumab in children with hemolytic uremic syndrome.

Greenbaum et al. report the first prospective trial of eculizumab in pediatric atypical hemolytic uremic syndrome. As in adult trials, eculizumab appears effective and no serious safety signals were reported. There is the first suggestion of a dichotomy in response to treatment with a trend toward poorer outcome in those without complement abnormalities. This group, however, had worse renal function at presentation, and it remains to be seen whether this represents true non-response or merely late presentation.