Anti-Ro52 is mostly present in patients with different types of SARD22, as seen in nearly half of the patients with Sjögren's syndrome12, SSc15,16, and SLE17 and 20–30% of patients with PM/DM13,14, In this study, the prevalence of anti-Ro52 (6.9%) in IIP was lower than in SARD but higher than in healthy individuals (< 0.2–1%)23. This evidence concerns the gene TRIM21 and polymyositis.