The Use of Rituximab in the Management of Refractory Dermatomyositis.

There is growing adoption of rituximab in the treatment of dermatomyositis patients whose disease is refractory to steroids. However, the effects have not been extensively studied. This is a retrospective study of 25 patients with dermatomyositis who were treated with rituximab. Data from January 2000 to July 2014 was obtained from a clinical data repository, which yielded results from two tertiary centers in the United States. We analyzed information on muscle weakness, skin disease, enzyme levels, and immunosuppressive medication use before and after treatment with rituximab. The follow-up time was six months. Among the patients with skin disease before treatment with rituximab, 72.2% had a clinical improvement in their skin disease at the follow-up visit (P less than0.01). Among the patients with proximal muscle weakness before treatment with rituximab, 81.8% had clinical improvement in their symptoms at the follow-up visit (P less than0.01). The average prednisone dose before rituximab therapy was 18.9 mg, and this dropped to 11.0 mg at follow up (P less than 0.05). The average number of immunosuppressive medications taken by patients dropped from 2.04 to 1.74 (P less than0.05). These changes were less in magnitude and significance among the subset of patient that had an additional connective tissue autoimmune condition. <p><em>J Drugs Dermatol. 2017;16(2):162-166.</em></p>.