NRTN and amyotrophic lateral sclerosis: C–X–C motif chemokine 10 levels (OR = 0.894, 95% CI = 0.819–0.976, p = 0.012, FDR = 0.566), interleukin−2 receptor subunit beta levels (OR = 0.872, 95% CI = 0.767–0.991, p = 0.036, FDR = 0.654), neurturin levels (OR = 0.817, 95% CI = 0.703–0.949, p = 0.008, FDR = 0.749), and thymic stromal lymphopoietin levels (OR = 0.837, 95% CI = 0.720–0.973, p = 0.020, FDR = 0.619) were negatively correlated with ALS.