TRIM21 and interstitial lung disease: Of note, RP-ILD was more prevalent (75.0% vs. 30.8%, p = 0.042), the partial pressure of oxygen (PaO2)/fraction of inspired oxygen (FiO2) ratio was lower (320.0 [270.2–373.4] vs. 416.7 [346.2–437.6], median [IQR]; p = 0.029), and the alveolar–arterial oxygen gradient (A-aDO2) was higher (41.9 [30.4–54.2] vs. 19.2 [10.1–33.6], p = 0.019) in patients with isolated anti-Ro52 positivity than in those without.