CTD-ILD

The goal of this observational study is to identify early biomarkers that can predict the development of progressive pulmonary fibrosis (PPF) in participants with interstitial lung diseases (ILDs). The participant population includes adults diagnosed with idiopathic pulmonary fibrosis (IPF), familial pulmonary fibrosis (FPF), other fibrotic ILDs, and interstitial lung abnormalities (ILA). The main questions it aims to answer are: * What biomarkers and risk factors are linked to fibrosis progression or can predict rapid worsening and sudden flare-ups in IPF and FPF patients? * What biomarkers and risk factors can predict the development of a PPF phenotype in different types of ILD? * What biomarkers and risk factors can help identify ILA patients who may develop significant ILD? * What biomarkers and risk factors can predict how well ILD patients will respond to treatment? Researchers will compare the outcomes between participants diagnosed with IPF/FPF, other fibrotic ILDs, and ILA to see if early detection biomarkers differ among these groups. Participants will: * Undergo blood sampling. * Perform lung function tests. * Have CT scans. * Perform breath analysis * Participate in exposome and microbiome analyses. * Complete questionnaires. * A subgroup of participants will be offered bronchoscopy.

Interstitial lung disease (ILD) is a common pulmonary manifestation in chronic tissue diseases (CTD), significantly affecting patient's prognosis. The main purpose of this study is to evaluate the efficacy of telitacicept compared with placebo in slowing down the decline in lung volume in patients with interstitial lung disease associated with connective tissue disease (CTD-ILD) on the basis of standard treatment.

To evaluate the safety and tolerability of IxCell hUC-MSC-P in the treatment of patients with connective tissue disease-related interstitial lung disease. To evaluate the efficacy, pharmacokinetics and immunogenicity of IxCell hUC-MSC-P in the treatment of connective tissue disease-associated interstitial lung disease (CTD-ILD).