Dermatomyositis and polymyositis in breast cancer patients: a case reports

Abstract

Dermatomyositis and polymyositis are an autoimmune disease which is characterized by proximal skeletal muscle weakness, muscle inflammation and associated with a variety of skin manifestations. Both autoimmune conditions are mainly observed as an independent disease, though an association between dermato- and polymyositis and malignancy were described. Case reports of two patients are presented, in one of which dermatomyositis and breast cancer were manifested simultaneously, in the other - the development of polymyositis preceded the recurrence of the disease after a long-term remission. Also diagnostic and therapeutic options of both conditions are shown.

Keywords

• dermatomyositis
• polymyositis
• breast cancer
• paraneoplastic syndrome
• anti-her2 therapy