Adult and juvenile dermatomyositis (DM) are systemic immune-mediated inflammatory diseases most commonly affecting the skin and musculoskeletal system. Amyopathic dermatomyositis is a subtype of dermatomyositis that affects only the skin and lacks the characteristic muscle involvement. Treatment of these conditions, in particular the cutaneous manifestations, is challenging and currently no universally effective single treatment exists. Many patients have cutaneous manifestations that are refractory to numerous medications.~H.P. Acthar gel (adrenocorticotropic hormone gel) received FDA approval for treatment of a variety of diseases, including dermatomyositis, in 1952. Despite this there is a paucity of clinical data concerning the efficacy of H.P. Acthar gel for treating dermatomyositis. Recently a small, retrospective case series describing significant improvement in both cutaneous and musculoskeletal symptoms in 5 patients with refractory dermatomyositis treated with H.P. Acthar gel was reported and has resulted in renewed interest in use of this medication in dermatomyositis patient (reference below). The proposed efficacy of H.P. Acthar gel has been attributed to its unique ability to induce production of endogenous cortisol, corticosterone, aldosterone, and to bind melanocortin receptors on lymphocytes and other cells to modulate immunologic responses.
This study will assess the safety and efficacy of H.P. Acthar gel for treating the cutaneous manifestations in patients with refractory classic dermatomyositis, juvenile dermatomyositis, and amyopathic dermatomyositis. Our hypothesis is that H.P. Acthar gel will be both safe and effective for such patients.