CD19 and dermatomyositis: A refractory case of anti-melanoma differentiation-associated protein 5-positive dermatomyositis (MDA5+ DM), complicated by rapidly progressive ILD in a 12-year-old female, was managed with the infusion of second-generation anti-CD19 CAR-T cells (ARI-0001) following stabilization of the patient with high-dose corticosteroids, tacrolimus, and intravenous immunoglobulin [47].