PSIP1 and polymyositis: Additionally, the positive rates of anti-DFS70 in MCTD, RA, SS, scleroderma, and DM/PM patients were 14.7% (5/34), 12.3% (9/73), 9.4% (3/32), 9.1% (1/11), and 6.8% (3/44), respectively.