The overall aim of the study is to develop and validate a Rheumatoid Arthritis-Interstitial Lung Disease (RA-ILD) clinical prediction model (screening tool) based on risk factors to guide screening for ILD in patients with RA using High Resolution Computed Tomography (HRCT).

Inclusion criteria:

1. Adult patients with RA according to 1987 American College of Rheumatology (ACR) or 2010 ACR / European League Against Rheumatism (EULAR) classification of RA, with any RA duration

2. Patient must have ≥ 2 of the following risk factors for ILD (i.e., any 2 or more):

   • Male
   • Current or previous smoker
   • Age of ≥ 60 years at RA diagnosis
   • Rheumatoid factor high-positive (titer > 3x upper limit of normal) AND/OR anti-cyclic citrullinated peptide (anti-CCP) high-positive (titer > 3x upper limit of normal) at RA diagnosis or any time after RA diagnosis
   • High/severe RA disease activity score at screening visit or within 12 months of screening visit, as defined with any of the following measures: Disease Activity Score-28 (DAS-28), Clinical Disease Activity Index (CDAI), Routine Assessment of Patient Index Data 3 (RAPID-3), Simple Disease Activity Index (SDAI), Patient Activity Scale (PAS), PAS-II
   • Presence or history of these extra-articular manifestations of RA: vasculitis, Felty's syndrome, secondary Sjogren's syndrome, cutaneous rheumatoid nodules, serositis and/or scleritis/uveitis

Exclusion criteria:

1. Patients previously diagnosed with any ILD or interstitial lung abnormality (ILA)
2. Patients who have had a chest computerized tomography (CT) in the past 2 years
3. Pregnancy at time of HRCT (to be checked in women of child-bearing potential before scan)
4. Unwilling or unable to obtain HRCT
5. Patients previously received drugs or treatments that are known to induce ILD (e.g., radiation therapy to chest region, bleomycin). Note: All disease-modifying antirheumatic drugs (DMARDs) including methotrexate and biologics are allowed.
6. Patients who have had a lung transplant
7. Patients suspected of having developed ILD due to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection / coronavirus disease 19 (COVID-19) (based on Investigators' judgement)
8. Patients diagnosed with another autoimmune disorders overlapping with RA-associated with the development of ILD (systemic sclerosis, myositis, dermatomyositis, mixed connective tissue disease, systemic lupus erythematosus, antineutrophilic cytoplasmic antibody (ANCA)-associated vasculitis or primary Sjogren's syndrome)
9. Patients currently enrolled in an investigational new drug trial

Patients with Rheumatoid Arthritis (RA) and 2 or more risk factors for developing Interstitial Lung Disease (ILD)

Once the criteria in section "Time Frame" are fulfilled, researchers can use the following link https://www.mystudywindow.com/msw/datasharing to request access to the clinical study documents regarding this study, and upon a signed "Document Sharing Agreement".

Furthermore, researchers can request access to the clinical study data, for this and other listed studies, after the submission of a research proposal and according to the terms outlined in the website.

After structured results have been posted, all regulatory activities are completed in the US and EU for the product and indication, and after the primary manuscript has been accepted for publication.

For study documents - upon signing of a 'Document Sharing Agreement'. For study data - 1. after the submission and approval of the research proposal (checks will be performed by the sponsor and/or the independent review panel, including checking that the planned analysis does not compete with sponsor's publication plan); 2. and upon signing of a legal agreement.