Key clinical point: Six biomarkers, including fine-specificity anti-citrullinated protein antibodies (ACPA) and anti-native protein antibodies, demonstrated a significant association with rheumatoid arthritis-associated interstitial lung disease (RA-ILD) and improved prediction sensitivity.
Major finding: Six fine-specificity antibody biomarkers, including immunoglobin G, to citrullinated (adjusted odds ratio [aOR] 3.47; 95% CI 1.71-7.01) and native (aOR 2.53; 95% CI 1.47-4.34) cyclic filaggrin 48-65 were associated with an increased risk for RA-ILD. Risk scores combining antibodies with clinical features with vs without biomarkers (score 5.9 vs 2.6) demonstrated higher sensitivity (67% vs 25%) and high specificity (≥93%) for developing RA-ILD at a threshold of 50% predicted probability.
Study details: This nested case-control study within an ongoing prospective registry included adult patients with incident RA-ILD (n = 84) and matched patients with RA without ILD (n = 233).
Disclosures: This study was supported by the US National Institute of Arthritis and Musculoskeletal and Skin Diseases. Several authors reported ties with various sources unrelated to this study.
Source: Kronzer VL et al. Autoantibodies against citrullinated and native proteins and prediction of rheumatoid arthritis-associated interstitial lung disease: A nested case–control study. Lancet Rheumatol. 2023;5(2):E77-E87 (Feb). Doi: 10.1016/S2665-9913(22)00380-0