Refractory myositis in a patient of Sjögren's syndrome having only anti‐SS‐A (60 kDa) antibody.

We present a very rare case of primary Sjögren's syndrome with refractory myositis. She had only anti‐Ro60 antibody of anti‐SS‐A, which is extremely rare in patients with Sjögren's syndrome and polymyositis/dermatomyositis. We suggest a possibility that not only anti‐SS‐A/Ro52 but also anti‐SS‐A/Ro60 may contribute to the resistance in the same way. [ABSTRACT FROM AUTHOR]