Clinical characteristics of four myositis-specific autoantibodies with regulatory-approved testing in Japan: A Japanese multi-centre adult myositis patients’ cohort

Dermatomyositis (DM) and polymyositis (PM) represent a group of chronic inflammatory disorders characterised by myogenic changes, skin eruptions or both. Clinical features are heterogeneous, with various degrees of skin manifestations, myositis, pulmonary involvement and malignancy risk; in combination, they determine the severity and prognosis of the disease. Although the cause of these disorders remains unclear, autoimmunity is considered to...