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抗黑色素瘤分化相关基因5 (melanoma differentiation associated gene 5, MDA5)抗体是特发性炎性肌病(idiopathic inflammatory myopathy, IIM)中临床无肌病皮肌炎(clinical amyopathic dermatomyositis, CADM)亚型相对常见的肌炎特异性抗体(myositis specific antibody, MSA),在亚裔人群与快速进展性肺间质病变(rapidly progressive inters