Positive number and prevalence of individual autoantibody subtypes present in >5% of all IIP patients were as follows: anti-CCP antibody in 12 patients (6.2%), anti-double stranded DNA antibody in 14 (7.3%), anti-Ro52 antibody in 15 (7.8%), anti-ARS antibody in 10 (5.2%), ANA with a titer ≥1:320 in 23 (11.9%), ANA showing a nucleolar pattern in 12 (6.2%), and >2× upper limit of RF in 28 (14.5%). Here, TRIM21 is linked to idiopathic interstitial pneumonia.