Objective To study the relationship betwee n tumor and serumanticardiolipin antibodies(ACA) in elderly patients with derma tomyositis(DM).To seek early diagnosis of tumor complicated with DM.

• 目的探讨老年皮肌炎(DM)患者血清抗心磷脂抗体(ACA)与肿瘤发生率之间的关系，寻求肿瘤早期诊断指标。