NfL levels show a significant increase two years after KT in the groups both with (132.8 ng/mL, IQR 105.7–176.6 vs. 94.4 ng/mL, IQR 75.5–104.5) and without (125.1 ng/mL, IQR 107.5–160.9 vs. 84.4 ng/mL 66.4–102.7) fibrosis (Figure 4). This evidence concerns the gene NEFL and fibrosis.