Anti-TIF-1α/γ Antibody-Positive Dermatomyositis Associated With Metastatic Prostatic Adenocarcinoma.

ABSTRACT Dermatomyositis (DM) is an autoimmune myopathy characterized by proximal muscle weakness and distinct skin findings. DM is associated with an increased risk of malignancy in adults. We describe a case of dermatomyositis with unusually severe oropharyngeal dysphagia and respiratory muscle weakness on presentation, who was found to have underlying metastatic prostate cancer. Prostate cancer is uncommonly associated with DM. The patient tested positive for antitranscription intermediate family-1 (anti-TIF-1, also known as anti-p155/410) antibodies, which are linked to malignancy-associated DM in adults and are associated with dysphagia and more severe cutaneous findings.