Evaluating Safety & Efficacy of Apremilast in the Treatment of Cutaneous Disease in Patients With Recalcitrant Dermatomyositis

With limited treatment options available for dermatomyositis, the investigators hypothesize that apremilast, a phosphodiesterase-4 (PDE-4) inhibitor, is a safe and efficacious add-on treatment in patients with refractory cutaneous dermatomyositis. The study will investigate the efficacy, safety and toxicity of apremilast given at 30 mg twice daily to patients with refractory cutaneous dermatomyositis. Clinical response will be assessed at 1 and 3 months. Patients will also be evaluated for durability of their response for up to 6 months. Treatment will be monitored with frequent clinical visits (0, 1, 3 and 6 months) and blood tests (CBC, CMP, creatine kinase, aldolase). Treatment will be discontinued at disease progression or unacceptable adverse events. Disease progression is defined as 4 points increase in the cutaneous dermatomyositis disease area and severity index (CDASI) score, worsening of muscle disease by manual muscle testing (MMT-8) score and 5 points increase in dermatomyositis life quality index (DLQI). 5 mm skin biopsies from lesional skin will be performed before treatment with apremilast and after 3 months of treatment for gene expression profiling and confirmatory immunohistochemical stains.