Interstitial pneumonia with autoimmune features: A case series and overview

Area of Science:

• Pulmonology and Rheumatology
• Investigating the intersection of interstitial lung disease (ILD) and autoimmune conditions.

Background:

• Interstitial pneumonia with autoimmune features (IPAF) is a research classification for patients with idiopathic interstitial pneumonia (IIP) exhibiting autoimmune features but not meeting criteria for connective tissue disease (CTD).
• This classification aims to identify and manage patients with ILD who show signs of underlying autoimmune processes.

Observation:

• A cohort of six patients meeting IPAF criteria was characterized for clinical, serological, and radiological features.
• The study observed heterogeneity in clinical presentation and treatment responses among IPAF patients.
• Autoimmune features and disorders were identified in most patients, supporting their classification under IPAF.

Findings:

• IPAF patients represent a heterogeneous group with varied clinical and treatment profiles.
• No significant lung function decline or mortality was observed during a median follow-up of 35 months.
• The study did not establish definitive connective tissue disease (CTD) diagnoses in the observed IPAF cohort.

Implications:

• The IPAF classification aids in identifying patients with ILD and autoimmune tendencies who may not fit traditional CTD diagnoses.
• Further research is needed to refine the understanding and clinical utility of IPAF in the ILD field.
• The findings suggest IPAF is a valuable concept for managing a specific subset of patients with interstitial lung conditions and autoimmune characteristics.