Increased mortality in patients with RA-associated interstitial lung disease: data from a French administrative healthcare database.

Objectives: Interstitial lung disease (ILD) is a severe extra-articular manifestation of rheumatoid arthritis (RA). The objectives of this study were to estimate mortality rate in patients with RA-ILD and identify factors affecting mortality.
Methods: Data from a French national claims database (Système National des Données de Santé) from 2013 to 2018 were analysed. Adults with an RA diagnosis (International Classification of Diseases (ICD)-10 codes M05, M06.0, M06.8 and M06.9) were included. ILD diagnosis was defined with ICD-10 code J84. Mortality rates were compared between patients with RA with and without ILD, using Cox proportional hazards regression, after matching 1:1 for age, sex, age at RA-ILD onset and RA duration.
Results: Among 173 132 patients with RA, 4330 (3%) also had ILD (RA-ILD). After matching, RA-ILD was associated with an increased mortality rate (HR 3.4, 95% CI 3.1 to 3.9). The HR for mortality was greater for: patients aged <75 years (HR 4.8, 95% CI 3.9 to 5.9) versus ≥75 years (HR 3.0, 95% CI 2.6 to 3.5); patients with ILD onset occurring before RA onset (HR 8.4, 95% CI 5.5 to 13.0) versus ILD onset occurring after RA onset (HR 2.9, 95% CI 2.6 to 3.3); and men (HR 5.2, 95% CI 4.4 to 6.2) versus women (HR 3.6, 95% CI 3.0 to 4.2).
Conclusion: In this nationwide cohort study, RA-ILD was associated with increased mortality rate (vs in patients with RA without ILD), notably for those aged <75 years, those whose ILD preceded RA onset and men.
Competing Interests: Competing interests: PA-J has received grant/research support from AstraZeneca, Boehringer Ingelheim, Bristol Myers Squibb, Medac, Novartis, Roche Chugai and Societe Francaise de Rhumatologie; and consultancy fees from Bristol Myers Squibb. LW has received consultancy fees from Boehringer Ingelheim, Bristol Myers Squibb, Roche and Sanofi. SO has received consultancy fees from AbbVie, Bristol Myers Squibb, Eli Lilly, Merck Sharp & Dohme, Novartis, Roche-Chugai, SOBI and UCB. GD has received consultancy fees from Bristol Myers Squibb. JZ and VV-M are employees of and shareholders in Bristol Myers Squibb. R-MF has received speakers bureau fees from AbbVie, Bristol Myers Squibb, Eli Lilly, Janssen, Medac, Merck Sharp & Dohme, Novartis, Pfizer and Roche-Chugai; and grant/research support from Amgen, Janssen, Novartis and Pfizer. BC has received consultancy fees from Apellis, AstraZeneca, Boehringer Ingelheim, Bristol Myers Squibb, Novartis, Roche and Sanofi; and grant/research support from Boehringer Ingelheim, Bristol Myers Squibb and Roche. PD has received consultancy fees from Boehringer Ingelheim, Bristol Myers Squibb, Chugai, Eli Lilly, Medac, Novartis, Pfizer and Sanofi; and grant/research support from Bristol Myers Squibb, GlaxoSmithKline and Pfizer.
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