While no correlation was found between CSF GAP-43 concentrations and age in HCs, it correlated negatively with age (rs = −0.339, p < 0.001), disease duration (rs = −0.303, p = 0.002), and EDSS (rs = −0.369, p < 0.001, Fig. 1B) in the MS population. This evidence concerns the gene GAP43 and myeloid sarcoma.