Nintedanib in systemic sclerosis-associated interstitial lung disease: real-world cohort study on tolerability and discontinuation.

OBJECTIVES: Nintedanib slows progression of systemic sclerosis-associated interstitial lung disease (SSc-ILD), but its tolerability in this patient group is a potential concern.

METHODS: This multicentre study evaluated tolerability and treatment-related interruptions in SSc-ILD patients receiving nintedanib. Factors associated with interruption were analysed by logistic regression, with multivariable adjustment for potential confounders. Fisher's exact test was used when complete separation precluded logistic regression. Cox regression assessed time to first interruption. Weight changes before and after treatment were compared using the Wilcoxon signed-rank test.

RESULTS: Among 63 patients (mean age 56.5±13.8 years, 22% male), 76% received nintedanib 150 mg twice daily, the remainder 100 mg twice daily; 86% were on mycophenolate. Over a median 22.2-month follow-up (95% CI 18.1-26.2), 51% experienced nintedanib interruptions. Patient-reported reasons for treatment interruption included diarrhoea (33.3%), nausea/vomiting (20.6%), weight loss (9.5%) and reflux (1.6%). Older age (p< 0.03) and BMI <18.5 kg/m2 (p=0.024) were independently associated with interruption. BMI <18.5 kg/m2 was also independently linked to shorter time to interruption. Permanent discontinuation occurred in 20.6%, with no significant predictors identified. Weight loss in the 12±6 months after treatment initiation (mean 2.05 kg) was significantly greater than in the preceding 12±6 months (1.09 kg) (p=0.001).

CONCLUSIONS: Adverse effects frequently led to treatment interruptions in SSc-ILD patients. Older age and lower BMI were predictors of interruption, while no clear predictors of permanent discontinuation were identified. Most patients resumed treatment, highlighting the need for close monitoring and supportive care to manage side effects and maintain treatment continuity.