Rheumatoid arthritis-related interstitial lung disease (RA-ILD): a possible association between disease activity and prognosis.

• RA-ILD patients with high disease activity during follow-up had a worse prognosis than those with moderate or low disease activity. • The study results suggest the hypothesis that patients with RA-ILD must be treated with a treat to target strategy, with the aim of remission or low RA disease activity.