TGFB1 and Löfgren’s syndrome: The “Transforming Growth Factor (TGF)-β signalling pathway” with its highest miRSystem score among KEGG pathways was predicted to be significantly affected (p = 1.9 × 10−10; Supplementary material/Online Resource 3) by the cumulative effect of three miRNAs whose serum expressions were dysregulated between our patients with Löfgren's syndrome and those without Löfgren's syndrome.