Analyzing NF-L levels only in the group of patients, i.e., in patients without symptoms of neuropathy (G0) vs. patients with low-grade neuropathy (G1), we observed a smaller area under the curve, AUC = 0.630 (95% CI-0.553–0.702), with a cut-off point of 196 pg/mL and a significance level of p = 0.0076 (Figure 3). Here, NEFL is linked to neuropathy.