We report the results of nine patients with inclusion body myositis tr
eated with intravenous immunoglobulin in an open-label uncontrolled st
udy. None of our patients improved on objective manual muscle testing
or functional disability scores. One patient developed mild neutropeni
a, complicating the intravenous immunoglobulin treatment. Our results
do not exclude the possibility that intravenous immunoglobulin could b
e beneficial in some patients by slowing the rate of deterioration or
perhaps stabilizing the disease. However, given the lack of objective
improvement and high cast of treatment, we would not recommend intrave
nous immunoglobulin in the treatment of inclusion body myositis unless
a blinded, controlled trial demonstrates clear benefit.