Notably, our results proposed PDGFA as a prognostic indicator of RA-ILD severity, as its gene expression were lower in patients with radiological patterns considered to be more severe with a worse prognosis (UIP, probably UIP or an indeterminate radiological pattern) than in patients with better prognosis patterns (NINE or non-NINE) [8]. This evidence concerns the gene PDGFA and idiopathic pulmonary fibrosis.