We defined a fibrotic score based on the ACTA2, COL1A1 and FN1-normalized expression (from 0 to 1) and the DMD samples were divided into two subsets named “Low” (n = 3, with a fibrotic score equivalent to that of control biopsies and <0.25) and “High” (n = 5, with a fibrotic score >0.25). The gene discussed is FN1; the disease is Duchenne muscular dystrophy.